Support configuration of ext_wakeup sources. This patch makes it
possible to enable ext_wakeup and set it's polarity, depending on board
configuration. AM335x's dedicated PMIC (tps65217) uses ext_wakeup to
notify about power-button presses. Handling power-button presses enables
to recover from RTC-only power states correctly.
Signed-off-by: Marcin Niestroj <m.niestroj@xxxxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/rtc/rtc-omap.txt | 24 ++++++++++-
drivers/rtc/rtc-omap.c | 46 +++++++++++++++++++++-
2 files changed, 68 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
index bf7d11a..1c05311b 100644
--- a/Documentation/devicetree/bindings/rtc/rtc-omap.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
@@ -18,8 +18,20 @@ Optional properties:
through pmic_power_en
- clocks: Any internal or external clocks feeding in to rtc
- clock-names: Corresponding names of the clocks
+- ti,ext-wakeup-en: Enables ext_wakeup[n] sources. Value determines which
+ ext_wakeup is enabled by bitwise OR of corresponding bits.
+ Examples:
+ <1> - enabled ext_wakeup[0],
+ <2> - enabled ext_wakeup[1],
+ <3> - enabled ext_wakeup[0] and enabled ext_wakeup[1],
+ ...
+- ti,ext-wakeup-pol: Sets polarity of ext_wakeup[n] sources, similarly as
+ above. Set bit means active-low, unset bit means
+ active-high. Examples:
+ <1> - only ext_wakeup0 is active-low
+ <3> - only ext_wakeup0 and ext_wakeup1 are active-low
-Example:
+Examples:
rtc@1c23000 {
compatible = "ti,da830-rtc";
@@ -31,3 +43,13 @@ rtc@1c23000 {
clocks = <&clk_32k_rtc>, <&clk_32768_ck>;
clock-names = "ext-clk", "int-clk";
};
+
+rtc@44e3e000 {
+ compatible = "ti,am3352-rtc", "ti,da830-rtc";
+ reg = <0x44e3e000 0x1000>;
+ interrupts = <75
+ 76>;
+ system-power-controller;
+ ti,ext-wakeup-en = <1>;
+ ti,ext-wakeup-pol = <1>;
+};
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index ec2e9c5..1a46f5d 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -114,7 +114,11 @@
#define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1)
/* OMAP_RTC_PMIC bit fields: */
-#define OMAP_RTC_PMIC_POWER_EN_EN BIT(16)
+#define OMAP_RTC_PMIC_POWER_EN_EN BIT(16)
+#define OMAP_RTC_PMIC_EXT_WAKEUP_EN(x) (x)
+#define OMAP_RTC_PMIC_EXT_WAKEUP_POL(x) ((x) << 4)
+#define OMAP_RTC_PMIC_EXT_WAKEUP_EN_MASK 0x0F
+#define OMAP_RTC_PMIC_EXT_WAKEUP_POL_MASK 0xF0
/* OMAP_RTC_KICKER values */
#define KICK0_VALUE 0x83e70b13
@@ -533,6 +537,11 @@ static int omap_rtc_probe(struct platform_device *pdev)
const struct platform_device_id *id_entry;
const struct of_device_id *of_id;
int ret;
+ u32 ext_wakeup_en;
+ u32 ext_wakeup_pol;
+ bool has_ext_wakeup_en;
+ bool has_ext_wakeup_pol;
+ u32 val;
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
if (!rtc)
@@ -544,6 +553,30 @@ static int omap_rtc_probe(struct platform_device *pdev)
rtc->is_pmic_controller = rtc->type->has_pmic_mode &&
of_property_read_bool(pdev->dev.of_node,
"system-power-controller");
+ if (of_property_read_u32(pdev->dev.of_node,
+ "ti,ext-wakeup-en",
+ &ext_wakeup_en) >= 0) {
+ if (ext_wakeup_en < BIT(4))
+ has_ext_wakeup_en = true;
+ else
+ dev_err(&pdev->dev,
+ "wrong ext-wakeup-en value\n");
+ } else {
+ dev_err(&pdev->dev,
+ "no ext-wakeup-en\n");
+ }
+ if (of_property_read_u32(pdev->dev.of_node,
+ "ti,ext-wakeup-pol",
+ &ext_wakeup_pol) >= 0) {
+ if (ext_wakeup_pol < BIT(4))
+ has_ext_wakeup_pol = true;
+ else
+ dev_err(&pdev->dev,
+ "wrong ext-wakeup-pol value\n");
+ } else {
+ dev_err(&pdev->dev,
+ "no ext-wakeup-pol\n");
+ }
} else {
id_entry = platform_get_device_id(pdev);
rtc->type = (void *)id_entry->driver_data;
@@ -650,6 +683,17 @@ static int omap_rtc_probe(struct platform_device *pdev)
reg | OMAP_RTC_OSC_SEL_32KCLK_SRC);
}
+ if (has_ext_wakeup_en || has_ext_wakeup_pol) {
+ val = rtc_readl(rtc, OMAP_RTC_PMIC_REG);
+ if (has_ext_wakeup_en)
+ val = (val & ~OMAP_RTC_PMIC_EXT_WAKEUP_EN_MASK)
+ | OMAP_RTC_PMIC_EXT_WAKEUP_EN(ext_wakeup_en);
+ if (has_ext_wakeup_pol)
+ val = (val & ~OMAP_RTC_PMIC_EXT_WAKEUP_POL_MASK)
+ | OMAP_RTC_PMIC_EXT_WAKEUP_POL(ext_wakeup_pol);
+ rtc_writel(rtc, OMAP_RTC_PMIC_REG, val);
+ }
+
rtc->type->lock(rtc);
device_init_wakeup(&pdev->dev, true);
--
2.8.0
--
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