From mboxrd@z Thu Jan 1 00:00:00 1970 From: richard.zhao@freescale.com (Richard Zhao) Date: Fri, 25 May 2012 10:24:20 +0800 Subject: [PATCH v3 07/12] ARM: imx6q: add config-on-boot gpios In-Reply-To: <1337912665-16615-1-git-send-email-richard.zhao@freescale.com> References: <1337912665-16615-1-git-send-email-richard.zhao@freescale.com> Message-ID: <1337912665-16615-8-git-send-email-richard.zhao@freescale.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Sometimes, boards have gpios that don't own by any driver or owner by a generic driver that don't like hacks. Such gpios is normally output and need setup once on boot. So I introduce the config-on-boot gpios. Signed-off-by: Richard Zhao Cc: Shawn Guo Cc: Rob Herring Cc: Grant Likely --- .../devicetree/bindings/arm/config-on-boot.txt | 12 +++++++ arch/arm/boot/dts/imx6q-sabrelite.dts | 7 ++++ arch/arm/mach-imx/mach-imx6q.c | 35 ++++++++++++++++++++ 3 files changed, 54 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/arm/config-on-boot.txt diff --git a/Documentation/devicetree/bindings/arm/config-on-boot.txt b/Documentation/devicetree/bindings/arm/config-on-boot.txt new file mode 100644 index 0000000..f98ed74 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/config-on-boot.txt @@ -0,0 +1,12 @@ +* Configure on Boot + +Node name: config-on-boot + It must be in root node. config-on-boot means to describe settings that needs + to be set one time on boot but aren't owned by any driver, or the owned driver + is too generic to handle such settings. For example, usb hub uses generic + driver in usb core code, a on-board usb may need deassert reset pin. + +Optional properties: +- output-gpios: Output gpio array that needs to set. +- output-gpio-values: This property is required if output-gpios is set. + The value is a array of 0 or 1. Total count eaquals the number of gpios. diff --git a/arch/arm/boot/dts/imx6q-sabrelite.dts b/arch/arm/boot/dts/imx6q-sabrelite.dts index e0ec929..1dd2261 100644 --- a/arch/arm/boot/dts/imx6q-sabrelite.dts +++ b/arch/arm/boot/dts/imx6q-sabrelite.dts @@ -17,6 +17,13 @@ model = "Freescale i.MX6 Quad SABRE Lite Board"; compatible = "fsl,imx6q-sabrelite", "fsl,imx6q"; + config-on-boot { + output-gpios = < + &gpio3 22 0>; /* vbus reset */ + output-gpio-values = < + 1>; /* vbus reset */ + }; + memory { reg = <0x10000000 0x40000000>; }; diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c index b47e98b..577cf19 100644 --- a/arch/arm/mach-imx/mach-imx6q.c +++ b/arch/arm/mach-imx/mach-imx6q.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -113,6 +114,38 @@ static void __init imx6q_sabrelite_init(void) imx6q_sabrelite_cko1_setup(); } +static void __init imx6q_config_on_boot(void) +{ + struct device_node *np; + struct property *pp; + int cnt, len, i; + int gpio; + + np = of_find_node_by_path("/config-on-boot"); + if (!np) + return; + cnt = of_gpio_named_count(np, "output-gpios"); + pp = of_find_property(np, "output-gpio-values", &len); + if (!pp || cnt != len / sizeof(u32)) { + pr_err("Invalid config-on-boot gpios!\n"); + of_node_put(np); + return; + } + for (i = 0; i < cnt; i++) { + gpio = of_get_named_gpio(np, "output-gpios", i); + if (gpio_is_valid(gpio)) + gpio_request_one(gpio, GPIOF_OUT_INIT_HIGH, + "config-on-boot"); + } + + of_node_put(np); +} + +static void __init imx6q_post_populate(void) +{ + imx6q_config_on_boot(); +} + static void __init imx6q_init_machine(void) { /* @@ -126,6 +159,8 @@ static void __init imx6q_init_machine(void) of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); + imx6q_post_populate(); + imx6q_pm_init(); } -- 1.7.5.4