From mboxrd@z Thu Jan 1 00:00:00 1970 From: Geert Uytterhoeven Date: Tue, 04 Aug 2015 13:55:14 +0000 Subject: [PATCH v2 1/6] ARM: shmobile: r8a73a4 dtsi: Add missing "gpio-ranges" to gpio node Message-Id: <1438696519-13727-2-git-send-email-geert+renesas@glider.be> List-Id: References: <1438696519-13727-1-git-send-email-geert+renesas@glider.be> In-Reply-To: <1438696519-13727-1-git-send-email-geert+renesas@glider.be> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-arm-kernel@lists.infradead.org If a GPIO driver uses gpiochip_add_pin_range() (which is usually the case for GPIO/PFC combos), the GPIO hogging mechanism configured from DT doesn't work: requesting hog GPIO led1-high (chip r8a73a4_pfc, offset 28) failed The actual error code is -517 = -EPROBE_DEFER. The problem is that PFC+GPIO registration is handled in multiple steps: 1. pinctrl_register(), 2. gpiochip_add(), 3. gpiochip_add_pin_range(). Configuration of the hogs is handled in gpiochip_add(): gpiochip_add of_gpiochip_add of_gpiochip_scan_hogs gpiod_hog gpiochip_request_own_desc __gpiod_request chip->request pinctrl_request_gpio pinctrl_get_device_gpio_range However, at this point the GPIO controller hasn't been added to pinctrldev_list yet, so the range can't be found, and the operation fails with -EPROBE_DEFER. To fix this, add a "gpio-ranges" property to the gpio device node, so the ranges are added by of_gpiochip_add_pin_range(), which is called by of_gpiochip_add() before the call to of_gpiochip_scan_hogs(). Signed-off-by: Geert Uytterhoeven Acked-by: Laurent Pinchart Acked-by: Linus Walleij --- v2: - Add Acked-by. --- arch/arm/boot/dts/r8a73a4.dtsi | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm/boot/dts/r8a73a4.dtsi b/arch/arm/boot/dts/r8a73a4.dtsi index 5090d1a8f652e8be..cb4f7b2798fe23be 100644 --- a/arch/arm/boot/dts/r8a73a4.dtsi +++ b/arch/arm/boot/dts/r8a73a4.dtsi @@ -207,6 +207,13 @@ reg = <0 0xe6050000 0 0x9000>; gpio-controller; #gpio-cells = <2>; + gpio-ranges + <&pfc 0 0 31>, <&pfc 32 32 9>, + <&pfc 64 64 22>, <&pfc 96 96 31>, + <&pfc 128 128 7>, <&pfc 160 160 19>, + <&pfc 192 192 31>, <&pfc 224 224 27>, + <&pfc 256 256 28>, <&pfc 288 288 21>, + <&pfc 320 320 10>; interrupts-extended <&irqc0 0 0>, <&irqc0 1 0>, <&irqc0 2 0>, <&irqc0 3 0>, <&irqc0 4 0>, <&irqc0 5 0>, <&irqc0 6 0>, <&irqc0 7 0>, -- 1.9.1