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rtc: omap: Add internal clock enabling support 

The rtc can be clocked by an internal 32K clock. Adding the support
to enable the same.

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>
This commit is contained in:
Keerthy 2015-08-18 15:11:15 +05:30 committed by Alexandre Belloni
parent fff51e771e
commit 532409aa1b
1 changed files with 10 additions and 0 deletions
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10
drivers/rtc/rtc-omap.c
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@ -25,6 +25,7 @@
#include <linux/of_device.h> #include <linux/of_device.h>
#include <linux/pm_runtime.h> #include <linux/pm_runtime.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/clk.h>
/* /*
* The OMAP RTC is a year/month/day/hours/minutes/seconds BCD clock * The OMAP RTC is a year/month/day/hours/minutes/seconds BCD clock
@ -132,6 +133,7 @@ struct omap_rtc_device_type {
struct omap_rtc { struct omap_rtc {
struct rtc_device *rtc; struct rtc_device *rtc;
void __iomem *base; void __iomem *base;
struct clk *clk;
int irq_alarm; int irq_alarm;
int irq_timer; int irq_timer;
u8 interrupts_reg; u8 interrupts_reg;
@ -553,6 +555,11 @@ static int omap_rtc_probe(struct platform_device *pdev)
if (rtc->irq_alarm <= 0) if (rtc->irq_alarm <= 0)
return -ENOENT; return -ENOENT;
rtc->clk = devm_clk_get(&pdev->dev, "int-clk");
if (!IS_ERR(rtc->clk))
clk_prepare_enable(rtc->clk);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rtc->base = devm_ioremap_resource(&pdev->dev, res); rtc->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(rtc->base)) if (IS_ERR(rtc->base))
@ -681,6 +688,9 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
device_init_wakeup(&pdev->dev, 0); device_init_wakeup(&pdev->dev, 0);
if (!IS_ERR(rtc->clk))
clk_disable_unprepare(rtc->clk);
rtc->type->unlock(rtc); rtc->type->unlock(rtc);
/* leave rtc running, but disable irqs */ /* leave rtc running, but disable irqs */
rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0); rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0);