On some Soc's RTC is powered by an external power regulator.
e.g. RTC on DRA7 SoC. Make the OMAP RTC driver support a
power regulator.
Signed-off-by: Lokesh Vutla <lokeshvutla@xxxxxx>
---
Changes since v1:
- Separated probe deferral supporting into a new patch.
Documentation/devicetree/bindings/rtc/rtc-omap.txt | 3 +++
drivers/rtc/rtc-omap.c | 24 ++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
index 5a0f02d..c67a775 100644
--- a/Documentation/devicetree/bindings/rtc/rtc-omap.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
@@ -10,6 +10,9 @@ Required properties:
- interrupts: rtc timer, alarm interrupts in order
- interrupt-parent: phandle for the interrupt controller
+Optional Properties:
+- rtc-supply : phandle to the regulator device tree node if needed
+
Example:
rtc@1c23000 {
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index f28f1fd..8a8df2b 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -24,6 +24,7 @@
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/io.h>
+#include <linux/regulator/consumer.h>
/* The OMAP RTC is a year/month/day/hours/minutes/seconds BCD clock
* with century-range alarm matching, driven by the 32kHz clock.
@@ -124,6 +125,7 @@
* @device: Device Pointer.
* pdata : Copy of saved platform data.
* rtc_base : Base address of memory-mapped IO registers.
+ * rtc_reg : Pointer to RTC power regulator.
* rtc_alarm : RTC alarm interrupt number.
* rtc_timer : RTC timer interrupt number.
* irq_stat : Copy of Interrupt status register.
@@ -133,6 +135,7 @@ struct rtc_omap_dev {
struct device *dev;
unsigned long pdata;
void __iomem *rtc_base;
+ struct regulator *rtc_reg;
u32 rtc_alarm;
u32 rtc_timer;
u8 irqstat;
@@ -402,6 +405,7 @@ static int omap_rtc_probe(struct platform_device *pdev)
struct resource *res;
struct rtc_omap_dev *rtc_omap;
u8 reg, new_ctrl;
+ int ret;
const struct platform_device_id *id_entry;
const struct of_device_id *of_id;
@@ -440,6 +444,23 @@ static int omap_rtc_probe(struct platform_device *pdev)
if (IS_ERR(rtc_omap->rtc_base))
return PTR_ERR(rtc_omap->rtc_base);
+ rtc_omap->rtc_reg = devm_regulator_get_optional(&pdev->dev, "rtc");
+ if (IS_ERR(rtc_omap->rtc_reg)) {
+ if (PTR_ERR(rtc_omap->rtc_reg) == -EPROBE_DEFER) {
+ dev_err(&pdev->dev, "regulator not ready, retry\n");
+ return -EPROBE_DEFER;
+ }
+ rtc_omap->rtc_reg = NULL;
+ }
+
+ if (rtc_omap->rtc_reg) {
+ ret = regulator_enable(rtc_omap->rtc_reg);
+ if (ret) {
+ dev_dbg(&pdev->dev, "regulator enable failed\n");
+ return ret;
+ }
+ }
+
/* Enable the clock/module so that we can access the registers */
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
@@ -549,6 +570,9 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
+ if (rtc_omap->rtc_reg)
+ regulator_disable(rtc_omap->rtc_reg);
+
return 0;
}
--
1.9.1
--
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