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
in SLEEP mode (RTC-only) to notify about power-button presses. Handling
power-button presses enables to recover from RTC-only power states
correctly.
Implementation uses gpiochip to utilize standard bindings. However,
configuration is possible only using device-tree (no runtime changes).
Signed-off-by: Marcin Niestroj <m.niestroj@xxxxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/rtc/rtc-omap.txt | 18 +-
drivers/rtc/Kconfig | 2 +-
drivers/rtc/rtc-omap.c | 187 ++++++++++++++++++++-
3 files changed, 204 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
index bf7d11a..4a7738e 100644
--- a/Documentation/devicetree/bindings/rtc/rtc-omap.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
@@ -18,8 +18,12 @@ Optional properties:
through pmic_power_en
- clocks: Any internal or external clocks feeding in to rtc
- clock-names: Corresponding names of the clocks
+- gpio-controller: Mark as gpio controller when using ext_wakeup
+- #gpio-cells: Should be set to 2
+- ngpios: Number of ext_wakeup sources supported by processor (board)
+- ext-wakeup-gpios: List of ext_wakeup sources to configure
-Example:
+Examples:
rtc@1c23000 {
compatible = "ti,da830-rtc";
@@ -31,3 +35,15 @@ rtc@1c23000 {
clocks = <&clk_32k_rtc>, <&clk_32768_ck>;
clock-names = "ext-clk", "int-clk";
};
+
+rtc: rtc@44e3e000 {
+ compatible = "ti,am3352-rtc", "ti,da830-rtc";
+ reg = <0x44e3e000 0x1000>;
+ interrupts = <75
+ 76>;
+ system-power-controller;
+ gpio-controller;
+ #gpio-cells = <2>;
+ ngpios = <1>;
+ ext-wakeup-gpios = <&rtc 0 GPIO_ACTIVE_LOW>;
+};
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 3e84315..f013346 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1208,7 +1208,7 @@ config RTC_DRV_IMXDI
config RTC_DRV_OMAP
tristate "TI OMAP Real Time Clock"
- depends on ARCH_OMAP || ARCH_DAVINCI || COMPILE_TEST
+ depends on (ARCH_OMAP || ARCH_DAVINCI || COMPILE_TEST) && GPIOLIB
help
Say "yes" here to support the on chip real time clock
present on TI OMAP1, AM33xx, DA8xx/OMAP-L13x, AM43xx and DRA7xx.
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index ec2e9c5..e21e229 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -16,6 +16,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/rtc.h>
@@ -23,6 +24,8 @@
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio/driver.h>
#include <linux/pm_runtime.h>
#include <linux/io.h>
#include <linux/clk.h>
@@ -114,7 +117,11 @@
#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) (BIT(x))
+#define OMAP_RTC_PMIC_EXT_WAKEUP_POL(x) (BIT(x) << 4)
+#define OMAP_RTC_PMIC_EXT_WAKEUP_EN_MASK (0x0F)
+#define OMAP_RTC_PMIC_EXT_WAKEUP_POL_MASK (0x0F << 4)
/* OMAP_RTC_KICKER values */
#define KICK0_VALUE 0x83e70b13
@@ -131,6 +138,17 @@ struct omap_rtc_device_type {
void (*unlock)(struct omap_rtc *rtc);
};
+struct omap_rtc_gpio_desc {
+ struct gpio_desc *desc;
+ int hwnum;
+ bool active_low;
+};
+
+struct omap_rtc_gpio_descs {
+ unsigned int ndescs;
+ struct omap_rtc_gpio_desc desc[];
+};
+
struct omap_rtc {
struct rtc_device *rtc;
void __iomem *base;
@@ -141,6 +159,8 @@ struct omap_rtc {
bool is_pmic_controller;
bool has_ext_clk;
const struct omap_rtc_device_type *type;
+ struct gpio_chip gpio_chip;
+ struct omap_rtc_gpio_descs *descs;
};
static inline u8 rtc_read(struct omap_rtc *rtc, unsigned int reg)
@@ -183,6 +203,135 @@ static void default_rtc_lock(struct omap_rtc *rtc)
{
}
+static int omap_rtc_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ return 1; /* Always in */
+}
+
+static int omap_rtc_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ return 0;
+}
+
+static int omap_rtc_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ return 0;
+}
+
+static struct gpio_chip template_chip = {
+ .label = "omap-rtc-gpio",
+ .owner = THIS_MODULE,
+ .get_direction = omap_rtc_gpio_get_direction,
+ .direction_input = omap_rtc_gpio_direction_input,
+ .get = omap_rtc_gpio_get,
+ .base = -1,
+ .ngpio = 4,
+ .can_sleep = true,
+};
+
+static void omap_rtc_gpio_enable(struct omap_rtc *rtc)
+{
+ struct omap_rtc_gpio_descs *descs = rtc->descs;
+ struct omap_rtc_gpio_desc *desc;
+ u32 val;
+ unsigned int i;
+
+ if (!descs)
+ return;
+
+ val = rtc_readl(rtc, OMAP_RTC_PMIC_REG);
+ val &= ~(OMAP_RTC_PMIC_EXT_WAKEUP_EN_MASK
+ | OMAP_RTC_PMIC_EXT_WAKEUP_POL_MASK);
+
+ for (i = 0; i < descs->ndescs; i++) {
+ desc = &descs->desc[i];
+ val |= OMAP_RTC_PMIC_EXT_WAKEUP_EN(desc->hwnum);
+ if (desc->active_low)
+ val |= OMAP_RTC_PMIC_EXT_WAKEUP_POL(desc->hwnum);
+ }
+
+ rtc_writel(rtc, OMAP_RTC_PMIC_REG, val);
+}
+
+static void omap_rtc_gpio_disable(struct omap_rtc *rtc)
+{
+ u32 val;
+
+ val = rtc_readl(rtc, OMAP_RTC_PMIC_REG);
+ val &= ~(OMAP_RTC_PMIC_EXT_WAKEUP_EN_MASK
+ | OMAP_RTC_PMIC_EXT_WAKEUP_POL_MASK);
+ rtc_writel(rtc, OMAP_RTC_PMIC_REG, val);
+}
+
+static void omap_rtc_gpio_descs_put(struct omap_rtc_gpio_descs *descs)
+{
+ unsigned int i;
+
+ for (i = 0; i < descs->ndescs; i++)
+ gpiochip_free_own_desc(descs->desc[i].desc);
+
+ kfree(descs);
+}
+
+static struct omap_rtc_gpio_descs *omap_rtc_gpio_descs_get(struct device *dev)
+{
+ struct omap_rtc *rtc = dev_get_drvdata(dev);
+ struct device_node *np = dev->of_node;
+ struct gpio_chip *chip = &rtc->gpio_chip;
+ struct of_phandle_args of_args;
+ enum of_gpio_flags of_flags;
+ struct omap_rtc_gpio_descs *descs;
+ struct omap_rtc_gpio_desc *desc;
+ int index;
+ int count;
+ int ret;
+
+ count = of_gpio_named_count(np, "ext-wakeup-gpios");
+ if (count <= 0)
+ return ERR_PTR(-ENOENT);
+
+ descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count,
+ GFP_KERNEL);
+ if (!descs)
+ return ERR_PTR(-ENOMEM);
+
+ for (index = 0; index < count; index++) {
+ desc = &descs->desc[index];
+ ret = of_parse_phandle_with_args(np, "ext-wakeup-gpios",
+ "#gpio-cells", index,
+ &of_args);
+ if (ret) {
+ dev_err(dev, "Could not parse ext-wakeup-gpios %d\n",
+ index);
+ omap_rtc_gpio_descs_put(descs);
+ return ERR_PTR(ret);
+ }
+
+ ret = of_gpio_simple_xlate(chip, &of_args, &of_flags);
+ if (ret < 0) {
+ dev_err(dev, "Could not xlate %d\n", index);
+ omap_rtc_gpio_descs_put(descs);
+ return ERR_PTR(ret);
+ }
+ desc->hwnum = ret;
+
+ desc->desc = gpiochip_request_own_desc(chip, ret,
+ "omap-rtc-gpio");
+ if (IS_ERR(desc->desc)) {
+ dev_err(dev, "Could not request gpio %d\n", index);
+ omap_rtc_gpio_descs_put(descs);
+ return ERR_CAST(desc->desc);
+ }
+
+ desc->active_low = (of_flags & OF_GPIO_ACTIVE_LOW);
+ descs->ndescs++;
+ }
+
+ return descs;
+}
+
/*
* We rely on the rtc framework to handle locking (rtc->ops_lock),
* so the only other requirement is that register accesses which
@@ -532,6 +681,8 @@ 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;
+ struct omap_rtc_gpio_descs *descs = NULL;
+ u32 ngpios = 0;
int ret;
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
@@ -544,6 +695,10 @@ 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");
+ ret = of_property_read_u32(pdev->dev.of_node, "ngpios",
+ &ngpios);
+ if (ret)
+ ngpios = 0;
} else {
id_entry = platform_get_device_id(pdev);
rtc->type = (void *)id_entry->driver_data;
@@ -577,6 +732,26 @@ static int omap_rtc_probe(struct platform_device *pdev)
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
+ if (ngpios > 0) {
+ rtc->gpio_chip = template_chip;
+ rtc->gpio_chip.parent = &pdev->dev;
+ rtc->gpio_chip.ngpio = ngpios;
+ ret = devm_gpiochip_add_data(&pdev->dev, &rtc->gpio_chip,
+ rtc);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
+ ret);
+ return ret;
+ }
+
+ descs = omap_rtc_gpio_descs_get(&pdev->dev);
+ if (IS_ERR(descs)) {
+ dev_err(&pdev->dev, "Could not request gpios\n");
+ return PTR_ERR(descs);
+ }
+ rtc->descs = descs;
+ }
+
rtc->type->unlock(rtc);
/*
@@ -619,6 +794,8 @@ static int omap_rtc_probe(struct platform_device *pdev)
new_ctrl = reg & (OMAP_RTC_CTRL_SPLIT | OMAP_RTC_CTRL_AUTO_COMP);
new_ctrl |= OMAP_RTC_CTRL_STOP;
+ omap_rtc_gpio_enable(rtc);
+
/*
* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE:
*
@@ -684,6 +861,8 @@ static int omap_rtc_probe(struct platform_device *pdev)
return 0;
err:
+ if (descs)
+ omap_rtc_gpio_descs_put(descs);
device_init_wakeup(&pdev->dev, false);
rtc->type->lock(rtc);
pm_runtime_put_sync(&pdev->dev);
@@ -697,6 +876,9 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
struct omap_rtc *rtc = platform_get_drvdata(pdev);
u8 reg;
+ if (rtc->descs)
+ omap_rtc_gpio_descs_put(rtc->descs);
+
if (pm_power_off == omap_rtc_power_off &&
omap_rtc_power_off_rtc == rtc) {
pm_power_off = NULL;
@@ -709,6 +891,9 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
clk_disable_unprepare(rtc->clk);
rtc->type->unlock(rtc);
+
+ omap_rtc_gpio_disable(rtc);
+
/* leave rtc running, but disable irqs */
rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
--
2.8.0
--
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