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> --- Hi, This is a total reimplementation, so it is not based on any of the previos patch versions. This patch adds support for ext_wakeup using generic pinconf device-tree bindings, with one added "ti,input-polarity" custom property. This approach has been suggested by Tony and Grygorii in [1]. Patch was developed on 4.6, rebased on 4.8-rc3, tested using chiliBoard. [1] http://www.spinics.net/lists/devicetree/msg131516.html Documentation/devicetree/bindings/rtc/rtc-omap.txt | 21 +++ drivers/rtc/Kconfig | 1 + drivers/rtc/rtc-omap.c | 167 ++++++++++++++++++++- 3 files changed, 181 insertions(+), 8 deletions(-) diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt b/Documentation/devicetree/bindings/rtc/rtc-omap.txt index bf7d11a..5d18373 100644 --- a/Documentation/devicetree/bindings/rtc/rtc-omap.txt +++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt @@ -18,6 +18,18 @@ Optional properties: through pmic_power_en - clocks: Any internal or external clocks feeding in to rtc - clock-names: Corresponding names of the clocks +- pinctrl-0: a phandle pointing to the pin settings for the device +- pinctrl-names: should be "default" + +Optional subnodes: +- generic pinctrl node + +Required pinctrl subnodes properties: +- pins - Names of ext_wakeup pins to configure + +Optional pinctrl subnodes properties: +- input-enable - Enables ext_wakeup +- ti,input-polarity - GPIO_ACTIVE_LOW or GPIO_ACTIVE_HIGH depending board Example: @@ -30,4 +42,13 @@ rtc@1c23000 { system-power-controller; clocks = <&clk_32k_rtc>, <&clk_32768_ck>; clock-names = "ext-clk", "int-clk"; + + pinctrl-0 = <&ext_wakeup>; + pinctrl-names = "default"; + + ext_wakeup: ext_wakeup { + pins = "ext_wakeup0"; + input-enable; + ti,input-polarity = <GPIO_ACTIVE_LOW>; + }; }; diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index e215f50..647d913 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1231,6 +1231,7 @@ config RTC_DRV_IMXDI config RTC_DRV_OMAP tristate "TI OMAP Real Time Clock" depends on ARCH_OMAP || ARCH_DAVINCI || COMPILE_TEST + select GENERIC_PINCONF 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..b817afb 100644 --- a/drivers/rtc/rtc-omap.c +++ b/drivers/rtc/rtc-omap.c @@ -13,19 +13,23 @@ * 2 of the License, or (at your option) any later version. */ -#include <linux/kernel.h> +#include <dt-bindings/gpio/gpio.h> +#include <linux/bcd.h> +#include <linux/clk.h> +#include <linux/delay.h> #include <linux/init.h> -#include <linux/module.h> +#include <linux/io.h> #include <linux/ioport.h> -#include <linux/delay.h> -#include <linux/rtc.h> -#include <linux/bcd.h> -#include <linux/platform_device.h> +#include <linux/kernel.h> +#include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> +#include <linux/platform_device.h> #include <linux/pm_runtime.h> -#include <linux/io.h> -#include <linux/clk.h> +#include <linux/rtc.h> /* * The OMAP RTC is a year/month/day/hours/minutes/seconds BCD clock @@ -115,6 +119,8 @@ /* OMAP_RTC_PMIC bit fields: */ #define OMAP_RTC_PMIC_POWER_EN_EN BIT(16) +#define OMAP_RTC_PMIC_EXT_WKUP_EN(x) BIT(x) +#define OMAP_RTC_PMIC_EXT_WKUP_POL(x) BIT(4 + x) /* OMAP_RTC_KICKER values */ #define KICK0_VALUE 0x83e70b13 @@ -141,6 +147,7 @@ struct omap_rtc { bool is_pmic_controller; bool has_ext_clk; const struct omap_rtc_device_type *type; + struct pinctrl_dev *pctldev; }; static inline u8 rtc_read(struct omap_rtc *rtc, unsigned int reg) @@ -525,6 +532,138 @@ static const struct of_device_id omap_rtc_of_match[] = { }; MODULE_DEVICE_TABLE(of, omap_rtc_of_match); +static const struct pinctrl_pin_desc rtc_pins_desc[] = { + PINCTRL_PIN(0, "ext_wakeup0"), + PINCTRL_PIN(1, "ext_wakeup1"), + PINCTRL_PIN(2, "ext_wakeup2"), + PINCTRL_PIN(3, "ext_wakeup3"), +}; + +static int rtc_pinctrl_get_groups_count(struct pinctrl_dev *pctldev) +{ + return 0; +} + +static const char *rtc_pinctrl_get_group_name(struct pinctrl_dev *pctldev, + unsigned int group) +{ + return NULL; +} + +static const struct pinctrl_ops rtc_pinctrl_ops = { + .get_groups_count = rtc_pinctrl_get_groups_count, + .get_group_name = rtc_pinctrl_get_group_name, + .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, + .dt_free_map = pinconf_generic_dt_free_map, +}; + +enum rtc_pin_config_param { + PIN_CONFIG_INPUT_POLARITY = PIN_CONFIG_END + 1, +}; + +static const struct pinconf_generic_params rtc_params[] = { + {"ti,input-polarity", PIN_CONFIG_INPUT_POLARITY, GPIO_ACTIVE_HIGH}, +}; + +#ifdef CONFIG_DEBUG_FS +static const struct pin_config_item rtc_conf_items[ARRAY_SIZE(rtc_params)] = { + PCONFDUMP(PIN_CONFIG_INPUT_POLARITY, "input polarity", NULL, true), +}; +#endif + +static int rtc_pinconf_get(struct pinctrl_dev *pctldev, + unsigned int pin, unsigned long *config) +{ + struct omap_rtc *rtc = pinctrl_dev_get_drvdata(pctldev); + unsigned int param = pinconf_to_config_param(*config); + u32 val; + u16 arg = 0; + + rtc->type->unlock(rtc); + val = rtc_readl(rtc, OMAP_RTC_PMIC_REG); + rtc->type->lock(rtc); + + switch (param) { + case PIN_CONFIG_INPUT_ENABLE: + if (!(val & OMAP_RTC_PMIC_EXT_WKUP_EN(pin))) + return -EINVAL; + break; + case PIN_CONFIG_INPUT_POLARITY: + arg = !!(val & OMAP_RTC_PMIC_EXT_WKUP_POL(pin)); + break; + default: + return -ENOTSUPP; + }; + + *config = pinconf_to_config_packed(param, arg); + + return 0; +} + +static int rtc_pinconf_set(struct pinctrl_dev *pctldev, + unsigned int pin, unsigned long *configs, + unsigned int num_configs) +{ + struct omap_rtc *rtc = pinctrl_dev_get_drvdata(pctldev); + u32 val; + unsigned int param; + u16 param_val; + int i; + + rtc->type->unlock(rtc); + val = rtc_readl(rtc, OMAP_RTC_PMIC_REG); + rtc->type->lock(rtc); + + for (i = 0; i < num_configs; i++) { + param = pinconf_to_config_param(configs[i]); + param_val = pinconf_to_config_argument(configs[i]); + + switch (param) { + case PIN_CONFIG_INPUT_ENABLE: + if (param_val) + val |= OMAP_RTC_PMIC_EXT_WKUP_EN(pin); + else + val &= ~OMAP_RTC_PMIC_EXT_WKUP_EN(pin); + break; + case PIN_CONFIG_INPUT_POLARITY: + if (param_val == GPIO_ACTIVE_LOW) + val |= OMAP_RTC_PMIC_EXT_WKUP_POL(pin); + else + val &= ~OMAP_RTC_PMIC_EXT_WKUP_POL(pin); + break; + default: + dev_err(&rtc->rtc->dev, "Property %u not supported\n", + param); + return -ENOTSUPP; + } + } + + rtc->type->unlock(rtc); + rtc_writel(rtc, OMAP_RTC_PMIC_REG, val); + rtc->type->lock(rtc); + + return 0; +} + +static const struct pinconf_ops rtc_pinconf_ops = { + .is_generic = true, + .pin_config_get = rtc_pinconf_get, + .pin_config_set = rtc_pinconf_set, +}; + +static struct pinctrl_desc rtc_pinctrl_desc = { + .pins = rtc_pins_desc, + .npins = ARRAY_SIZE(rtc_pins_desc), + .pctlops = &rtc_pinctrl_ops, + .confops = &rtc_pinconf_ops, + .custom_params = rtc_params, + .num_custom_params = ARRAY_SIZE(rtc_params), +#ifdef CONFIG_DEBUG_FS + .custom_conf_items = rtc_conf_items, +#endif + .owner = THIS_MODULE, +}; + static int omap_rtc_probe(struct platform_device *pdev) { struct omap_rtc *rtc; @@ -681,6 +820,15 @@ static int omap_rtc_probe(struct platform_device *pdev) } } + /* Support ext_wakeup pinconf */ + rtc_pinctrl_desc.name = dev_name(&pdev->dev); + + rtc->pctldev = pinctrl_register(&rtc_pinctrl_desc, &pdev->dev, rtc); + if (IS_ERR(rtc->pctldev)) { + dev_err(&pdev->dev, "Couldn't register pinctrl driver\n"); + return PTR_ERR(rtc->pctldev); + } + return 0; err: @@ -724,6 +872,9 @@ static int __exit omap_rtc_remove(struct platform_device *pdev) pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); + /* Remove ext_wakeup pinconf */ + pinctrl_unregister(rtc->pctldev); + return 0; } -- 2.9.3 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
