Certain SoCs such as DRA7, RTC is an independent voltage domain of it's own
and on platforms such as DRA7-evm, this may be supplied by individual
regulator on it's own.
So make the OMAP RTC driver support a power regulator.
Signed-off-by: Lokesh Vutla <lokeshvu...@ti.com>
---
- Dropped the Reviewed-by tags as this patch is changed from previous version.
Documentation/devicetree/bindings/rtc/rtc-omap.txt | 6 ++++
drivers/rtc/rtc-omap.c | 41 +++++++++++++++++++++-
2 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt
b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
index 750efd4..c1d84ac 100644
--- a/Documentation/devicetree/bindings/rtc/rtc-omap.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
@@ -15,6 +15,9 @@ Required properties:
Optional properties:
- ti,system-power-controller: whether the rtc is controlling the system power
through pmic_power_en
+- vrtc-supply: phandle to the regulator device tree node.
+- vrtc-minuV: Minimum required voltage in uV, If default voltage needs to be
changed
+- vrtc-maxuV: Maximum acceptable voltage in uV, If default voltage needs to be
changed
Example:
@@ -25,4 +28,7 @@ rtc@1c23000 {
19>;
interrupt-parent = <&intc>;
ti,system-power-controller;
+ vrtc-supply = <&ldo9_reg>;
+ vrtc-minuV = <1050000>;
+ vrtc-maxuV = <1050000>;
};
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index d9bb5e7..7f1358a 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -25,6 +25,7 @@
#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
@@ -134,6 +135,7 @@ struct omap_rtc {
u8 interrupts_reg;
bool is_pmic_controller;
const struct omap_rtc_device_type *type;
+ struct regulator *supply;
};
static inline u8 rtc_read(struct omap_rtc *rtc, unsigned int reg)
@@ -484,7 +486,7 @@ static int omap_rtc_probe(struct platform_device *pdev)
u8 reg, mask, new_ctrl;
const struct platform_device_id *id_entry;
const struct of_device_id *of_id;
- int ret;
+ int ret, vrtc_minuV = 0, vrtc_maxuV = 0;
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
if (!rtc)
@@ -514,6 +516,37 @@ static int omap_rtc_probe(struct platform_device *pdev)
if (IS_ERR(rtc->base))
return PTR_ERR(rtc->base);
+ rtc->supply = devm_regulator_get_optional(&pdev->dev, "vrtc");
+ if (IS_ERR(rtc->supply)) {
+ if (PTR_ERR(rtc->supply) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ rtc->supply = NULL;
+ }
+
+ if (rtc->supply) {
+ of_property_read_u32(pdev->dev.of_node, "vrtc-minuV",
+ &vrtc_minuV);
+ of_property_read_u32(pdev->dev.of_node, "vrtc-maxuV",
+ &vrtc_maxuV);
+ if (vrtc_minuV && vrtc_maxuV) {
+ ret = regulator_set_voltage(rtc->supply,
+ vrtc_minuV, vrtc_maxuV);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to set volt %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ ret = regulator_enable(rtc->supply);
+ if (ret) {
+ dev_err(&pdev->dev, "regulator enable failed %d\n",
+ ret);
+ return ret;
+ }
+ }
+
platform_set_drvdata(pdev, rtc);
/* Enable the clock/module so that we can access the registers */
@@ -624,6 +657,9 @@ err:
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
+ if (rtc->supply)
+ regulator_disable(rtc->supply);
+
return ret;
}
@@ -649,6 +685,9 @@ static int __exit omap_rtc_remove(struct platform_device
*pdev)
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
+ if (rtc->supply)
+ regulator_disable(rtc->supply);
+
return 0;
}
--
1.9.1
--
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