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rtc: omap: Add external clock enabling support
Configure the clock source to external clock if available. External clock is preferred as it can be ticking during suspend. Signed-off-by: Keerthy <j-keerthy@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
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parent
532409aa1b
commit
399cf0f63f
1 changed files with 24 additions and 1 deletions
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@ -108,6 +108,7 @@
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/* OMAP_RTC_OSC_REG bit fields: */
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#define OMAP_RTC_OSC_32KCLK_EN BIT(6)
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#define OMAP_RTC_OSC_SEL_32KCLK_SRC BIT(3)
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/* OMAP_RTC_IRQWAKEEN bit fields: */
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#define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1)
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@ -138,6 +139,7 @@ struct omap_rtc {
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int irq_timer;
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u8 interrupts_reg;
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bool is_pmic_controller;
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bool has_ext_clk;
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const struct omap_rtc_device_type *type;
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};
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@ -555,7 +557,11 @@ static int omap_rtc_probe(struct platform_device *pdev)
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if (rtc->irq_alarm <= 0)
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return -ENOENT;
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rtc->clk = devm_clk_get(&pdev->dev, "int-clk");
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rtc->clk = devm_clk_get(&pdev->dev, "ext-clk");
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if (!IS_ERR(rtc->clk))
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rtc->has_ext_clk = true;
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else
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rtc->clk = devm_clk_get(&pdev->dev, "int-clk");
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if (!IS_ERR(rtc->clk))
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clk_prepare_enable(rtc->clk);
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@ -634,6 +640,16 @@ static int omap_rtc_probe(struct platform_device *pdev)
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if (reg != new_ctrl)
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rtc_write(rtc, OMAP_RTC_CTRL_REG, new_ctrl);
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/*
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* If we have the external clock then switch to it so we can keep
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* ticking across suspend.
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*/
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if (rtc->has_ext_clk) {
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reg = rtc_read(rtc, OMAP_RTC_OSC_REG);
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rtc_write(rtc, OMAP_RTC_OSC_REG,
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reg | OMAP_RTC_OSC_SEL_32KCLK_SRC);
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}
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rtc->type->lock(rtc);
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device_init_wakeup(&pdev->dev, true);
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@ -679,6 +695,7 @@ static int omap_rtc_probe(struct platform_device *pdev)
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static int __exit omap_rtc_remove(struct platform_device *pdev)
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{
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struct omap_rtc *rtc = platform_get_drvdata(pdev);
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u8 reg;
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if (pm_power_off == omap_rtc_power_off &&
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omap_rtc_power_off_rtc == rtc) {
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@ -695,6 +712,12 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
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/* leave rtc running, but disable irqs */
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rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
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if (rtc->has_ext_clk) {
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reg = rtc_read(rtc, OMAP_RTC_OSC_REG);
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reg &= ~OMAP_RTC_OSC_SEL_32KCLK_SRC;
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rtc_write(rtc, OMAP_RTC_OSC_REG, reg);
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}
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rtc->type->lock(rtc);
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/* Disable the clock/module */
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