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ASoC: stm32: spdifrx: add power management
Add suspend and resume sleep callbacks to STM32 SPDIFRX driver, to support system low power modes. Signed-off-by: Olivier Moysan <olivier.moysan@st.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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parent
bbfaa7d36c
commit
f68c2a682d
1 changed files with 39 additions and 3 deletions
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@ -21,6 +21,7 @@
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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/pinctrl/consumer.h>
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#include <linux/regmap.h>
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#include <linux/reset.h>
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@ -471,6 +472,8 @@ static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx)
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memset(spdifrx->cs, 0, SPDIFRX_CS_BYTES_NB);
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memset(spdifrx->ub, 0, SPDIFRX_UB_BYTES_NB);
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pinctrl_pm_select_default_state(&spdifrx->pdev->dev);
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ret = stm32_spdifrx_dma_ctrl_start(spdifrx);
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if (ret < 0)
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return ret;
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@ -502,6 +505,7 @@ static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx)
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end:
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clk_disable_unprepare(spdifrx->kclk);
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pinctrl_pm_select_sleep_state(&spdifrx->pdev->dev);
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return ret;
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}
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@ -611,10 +615,15 @@ static bool stm32_spdifrx_readable_reg(struct device *dev, unsigned int reg)
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static bool stm32_spdifrx_volatile_reg(struct device *dev, unsigned int reg)
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{
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if (reg == STM32_SPDIFRX_DR)
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switch (reg) {
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case STM32_SPDIFRX_DR:
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case STM32_SPDIFRX_CSR:
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case STM32_SPDIFRX_SR:
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case STM32_SPDIFRX_DIR:
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return true;
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return false;
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default:
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return false;
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}
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}
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static bool stm32_spdifrx_writeable_reg(struct device *dev, unsigned int reg)
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@ -638,6 +647,7 @@ static const struct regmap_config stm32_h7_spdifrx_regmap_conf = {
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.volatile_reg = stm32_spdifrx_volatile_reg,
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.writeable_reg = stm32_spdifrx_writeable_reg,
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.fast_io = true,
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.cache_type = REGCACHE_FLAT,
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};
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static irqreturn_t stm32_spdifrx_isr(int irq, void *devid)
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@ -983,10 +993,36 @@ static int stm32_spdifrx_remove(struct platform_device *pdev)
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MODULE_DEVICE_TABLE(of, stm32_spdifrx_ids);
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#ifdef CONFIG_PM_SLEEP
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static int stm32_spdifrx_suspend(struct device *dev)
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{
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struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(dev);
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regcache_cache_only(spdifrx->regmap, true);
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regcache_mark_dirty(spdifrx->regmap);
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return 0;
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}
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static int stm32_spdifrx_resume(struct device *dev)
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{
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struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(dev);
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regcache_cache_only(spdifrx->regmap, false);
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return regcache_sync(spdifrx->regmap);
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}
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#endif /* CONFIG_PM_SLEEP */
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static const struct dev_pm_ops stm32_spdifrx_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(stm32_spdifrx_suspend, stm32_spdifrx_resume)
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};
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static struct platform_driver stm32_spdifrx_driver = {
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.driver = {
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.name = "st,stm32-spdifrx",
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.of_match_table = stm32_spdifrx_ids,
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.pm = &stm32_spdifrx_pm_ops,
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},
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.probe = stm32_spdifrx_probe,
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.remove = stm32_spdifrx_remove,
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