mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-20 14:16:02 +00:00
iio: dac: stm32: add power management support
Add support for runtime PM & sleep. Provide pclk to regmap as registers access doesn't need full power (e.g. regulator). Always restore HFSEL when resuming. It may get lost depending on low power level that has been achieved. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
parent
3ea39d61ee
commit
9d8e91d916
2 changed files with 200 additions and 34 deletions
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@ -11,6 +11,7 @@
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/pm_runtime.h>
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#include <linux/regulator/consumer.h>
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#include <linux/reset.h>
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@ -50,6 +51,41 @@ static const struct regmap_config stm32_dac_regmap_cfg = {
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.max_register = 0x3fc,
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};
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static int stm32_dac_core_hw_start(struct device *dev)
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{
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struct stm32_dac_common *common = dev_get_drvdata(dev);
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struct stm32_dac_priv *priv = to_stm32_dac_priv(common);
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int ret;
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ret = regulator_enable(priv->vref);
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if (ret < 0) {
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dev_err(dev, "vref enable failed: %d\n", ret);
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return ret;
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}
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ret = clk_prepare_enable(priv->pclk);
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if (ret < 0) {
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dev_err(dev, "pclk enable failed: %d\n", ret);
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goto err_regulator_disable;
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}
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return 0;
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err_regulator_disable:
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regulator_disable(priv->vref);
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return ret;
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}
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static void stm32_dac_core_hw_stop(struct device *dev)
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{
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struct stm32_dac_common *common = dev_get_drvdata(dev);
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struct stm32_dac_priv *priv = to_stm32_dac_priv(common);
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clk_disable_unprepare(priv->pclk);
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regulator_disable(priv->vref);
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}
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static int stm32_dac_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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@ -66,6 +102,8 @@ static int stm32_dac_probe(struct platform_device *pdev)
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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platform_set_drvdata(pdev, &priv->common);
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cfg = (const struct stm32_dac_cfg *)
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of_match_device(dev->driver->of_match_table, dev)->data;
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@ -74,11 +112,19 @@ static int stm32_dac_probe(struct platform_device *pdev)
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if (IS_ERR(mmio))
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return PTR_ERR(mmio);
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regmap = devm_regmap_init_mmio(dev, mmio, &stm32_dac_regmap_cfg);
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regmap = devm_regmap_init_mmio_clk(dev, "pclk", mmio,
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&stm32_dac_regmap_cfg);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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priv->common.regmap = regmap;
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priv->pclk = devm_clk_get(dev, "pclk");
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if (IS_ERR(priv->pclk)) {
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ret = PTR_ERR(priv->pclk);
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dev_err(dev, "pclk get failed\n");
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return ret;
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}
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priv->vref = devm_regulator_get(dev, "vref");
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if (IS_ERR(priv->vref)) {
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ret = PTR_ERR(priv->vref);
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@ -86,33 +132,22 @@ static int stm32_dac_probe(struct platform_device *pdev)
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return ret;
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}
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ret = regulator_enable(priv->vref);
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if (ret < 0) {
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dev_err(dev, "vref enable failed\n");
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return ret;
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}
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pm_runtime_get_noresume(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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ret = stm32_dac_core_hw_start(dev);
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if (ret)
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goto err_pm_stop;
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ret = regulator_get_voltage(priv->vref);
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if (ret < 0) {
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dev_err(dev, "vref get voltage failed, %d\n", ret);
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goto err_vref;
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goto err_hw_stop;
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}
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priv->common.vref_mv = ret / 1000;
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dev_dbg(dev, "vref+=%dmV\n", priv->common.vref_mv);
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priv->pclk = devm_clk_get(dev, "pclk");
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if (IS_ERR(priv->pclk)) {
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ret = PTR_ERR(priv->pclk);
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dev_err(dev, "pclk get failed\n");
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goto err_vref;
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}
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ret = clk_prepare_enable(priv->pclk);
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if (ret < 0) {
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dev_err(dev, "pclk enable failed\n");
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goto err_vref;
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}
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priv->rst = devm_reset_control_get_exclusive(dev, NULL);
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if (!IS_ERR(priv->rst)) {
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reset_control_assert(priv->rst);
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@ -128,39 +163,79 @@ static int stm32_dac_probe(struct platform_device *pdev)
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priv->common.hfsel ?
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STM32H7_DAC_CR_HFSEL : 0);
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if (ret)
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goto err_pclk;
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goto err_hw_stop;
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}
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platform_set_drvdata(pdev, &priv->common);
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ret = of_platform_populate(pdev->dev.of_node, NULL, NULL, dev);
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if (ret < 0) {
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dev_err(dev, "failed to populate DT children\n");
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goto err_pclk;
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goto err_hw_stop;
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}
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pm_runtime_put(dev);
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return 0;
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err_pclk:
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clk_disable_unprepare(priv->pclk);
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err_vref:
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regulator_disable(priv->vref);
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err_hw_stop:
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stm32_dac_core_hw_stop(dev);
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err_pm_stop:
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pm_runtime_disable(dev);
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pm_runtime_set_suspended(dev);
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pm_runtime_put_noidle(dev);
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return ret;
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}
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static int stm32_dac_remove(struct platform_device *pdev)
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{
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struct stm32_dac_common *common = platform_get_drvdata(pdev);
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struct stm32_dac_priv *priv = to_stm32_dac_priv(common);
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pm_runtime_get_sync(&pdev->dev);
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of_platform_depopulate(&pdev->dev);
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clk_disable_unprepare(priv->pclk);
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regulator_disable(priv->vref);
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stm32_dac_core_hw_stop(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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pm_runtime_set_suspended(&pdev->dev);
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pm_runtime_put_noidle(&pdev->dev);
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return 0;
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}
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static int __maybe_unused stm32_dac_core_resume(struct device *dev)
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{
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struct stm32_dac_common *common = dev_get_drvdata(dev);
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struct stm32_dac_priv *priv = to_stm32_dac_priv(common);
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int ret;
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if (priv->common.hfsel) {
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/* restore hfsel (maybe lost under low power state) */
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ret = regmap_update_bits(priv->common.regmap, STM32_DAC_CR,
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STM32H7_DAC_CR_HFSEL,
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STM32H7_DAC_CR_HFSEL);
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if (ret)
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return ret;
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}
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return pm_runtime_force_resume(dev);
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}
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static int __maybe_unused stm32_dac_core_runtime_suspend(struct device *dev)
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{
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stm32_dac_core_hw_stop(dev);
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return 0;
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}
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static int __maybe_unused stm32_dac_core_runtime_resume(struct device *dev)
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{
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return stm32_dac_core_hw_start(dev);
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}
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static const struct dev_pm_ops stm32_dac_core_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, stm32_dac_core_resume)
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SET_RUNTIME_PM_OPS(stm32_dac_core_runtime_suspend,
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stm32_dac_core_runtime_resume,
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NULL)
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};
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static const struct stm32_dac_cfg stm32h7_dac_cfg = {
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.has_hfsel = true,
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};
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@ -182,6 +257,7 @@ static struct platform_driver stm32_dac_driver = {
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.driver = {
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.name = "stm32-dac-core",
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.of_match_table = stm32_dac_of_match,
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.pm = &stm32_dac_core_pm_ops,
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},
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};
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module_platform_driver(stm32_dac_driver);
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@ -13,6 +13,7 @@
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include "stm32-dac-core.h"
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#define STM32_DAC_CHANNEL_2 2
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#define STM32_DAC_IS_CHAN_1(ch) ((ch) & STM32_DAC_CHANNEL_1)
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#define STM32_DAC_AUTO_SUSPEND_DELAY_MS 2000
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/**
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* struct stm32_dac - private data of DAC driver
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* @common: reference to DAC common data
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bool enable)
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{
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struct stm32_dac *dac = iio_priv(indio_dev);
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struct device *dev = indio_dev->dev.parent;
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u32 msk = STM32_DAC_IS_CHAN_1(ch) ? STM32_DAC_CR_EN1 : STM32_DAC_CR_EN2;
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u32 en = enable ? msk : 0;
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int ret;
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/* already enabled / disabled ? */
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mutex_lock(&indio_dev->mlock);
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ret = stm32_dac_is_enabled(indio_dev, ch);
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if (ret < 0 || enable == !!ret) {
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mutex_unlock(&indio_dev->mlock);
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return ret < 0 ? ret : 0;
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}
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if (enable) {
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ret = pm_runtime_get_sync(dev);
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if (ret < 0) {
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pm_runtime_put_noidle(dev);
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mutex_unlock(&indio_dev->mlock);
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return ret;
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}
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}
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ret = regmap_update_bits(dac->common->regmap, STM32_DAC_CR, msk, en);
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mutex_unlock(&indio_dev->mlock);
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if (ret < 0) {
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dev_err(&indio_dev->dev, "%s failed\n", en ?
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"Enable" : "Disable");
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return ret;
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goto err_put_pm;
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}
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/*
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if (en && dac->common->hfsel)
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udelay(1);
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if (!enable) {
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pm_runtime_mark_last_busy(dev);
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pm_runtime_put_autosuspend(dev);
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}
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return 0;
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err_put_pm:
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if (enable) {
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pm_runtime_mark_last_busy(dev);
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pm_runtime_put_autosuspend(dev);
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}
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return ret;
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}
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static int stm32_dac_get_value(struct stm32_dac *dac, int channel, int *val)
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static int stm32_dac_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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struct iio_dev *indio_dev;
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struct stm32_dac *dac;
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int ret;
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if (ret < 0)
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return ret;
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return devm_iio_device_register(&pdev->dev, indio_dev);
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/* Get stm32-dac-core PM online */
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pm_runtime_get_noresume(dev);
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pm_runtime_set_active(dev);
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pm_runtime_set_autosuspend_delay(dev, STM32_DAC_AUTO_SUSPEND_DELAY_MS);
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pm_runtime_use_autosuspend(dev);
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pm_runtime_enable(dev);
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ret = iio_device_register(indio_dev);
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if (ret)
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goto err_pm_put;
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pm_runtime_mark_last_busy(dev);
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pm_runtime_put_autosuspend(dev);
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return 0;
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err_pm_put:
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pm_runtime_disable(dev);
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pm_runtime_set_suspended(dev);
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pm_runtime_put_noidle(dev);
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return ret;
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}
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static int stm32_dac_remove(struct platform_device *pdev)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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pm_runtime_get_sync(&pdev->dev);
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iio_device_unregister(indio_dev);
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pm_runtime_disable(&pdev->dev);
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pm_runtime_set_suspended(&pdev->dev);
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pm_runtime_put_noidle(&pdev->dev);
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return 0;
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}
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static int __maybe_unused stm32_dac_suspend(struct device *dev)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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int channel = indio_dev->channels[0].channel;
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int ret;
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/* Ensure DAC is disabled before suspend */
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ret = stm32_dac_is_enabled(indio_dev, channel);
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if (ret)
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return ret < 0 ? ret : -EBUSY;
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return pm_runtime_force_suspend(dev);
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}
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static const struct dev_pm_ops stm32_dac_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(stm32_dac_suspend, pm_runtime_force_resume)
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};
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static const struct of_device_id stm32_dac_of_match[] = {
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{ .compatible = "st,stm32-dac", },
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{},
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static struct platform_driver stm32_dac_driver = {
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.probe = stm32_dac_probe,
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.remove = stm32_dac_remove,
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.driver = {
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.name = "stm32-dac",
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.of_match_table = stm32_dac_of_match,
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.pm = &stm32_dac_pm_ops,
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},
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};
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module_platform_driver(stm32_dac_driver);
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