| From b2b691e4954725d909adda858caa561b780a154a Mon Sep 17 00:00:00 2001 |
| From: Geert Uytterhoeven <geert+renesas@glider.be> |
| Date: Tue, 4 Aug 2015 15:55:15 +0200 |
| Subject: [PATCH 206/326] ARM: shmobile: r8a7740 dtsi: Add missing |
| "gpio-ranges" to gpio node |
| |
| 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 lcd0 (chip r8a7740_pfc, offset 176) 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 range is 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 <geert+renesas@glider.be> |
| Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> |
| Acked-by: Linus Walleij <linus.walleij@linaro.org> |
| Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
| (cherry picked from commit 09d1c7b4babd3ef9bfc0a148931e5e5702db5e1b) |
| Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
| --- |
| arch/arm/boot/dts/r8a7740.dtsi | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| diff --git a/arch/arm/boot/dts/r8a7740.dtsi b/arch/arm/boot/dts/r8a7740.dtsi |
| index d84714468cce..e14cb1438216 100644 |
| --- a/arch/arm/boot/dts/r8a7740.dtsi |
| +++ b/arch/arm/boot/dts/r8a7740.dtsi |
| @@ -291,6 +291,7 @@ |
| <0xe605800c 0x20>; |
| gpio-controller; |
| #gpio-cells = <2>; |
| + gpio-ranges = <&pfc 0 0 212>; |
| interrupts-extended = |
| <&irqpin0 0 0>, <&irqpin0 1 0>, <&irqpin0 2 0>, <&irqpin0 3 0>, |
| <&irqpin0 4 0>, <&irqpin0 5 0>, <&irqpin0 6 0>, <&irqpin0 7 0>, |
| -- |
| 2.6.2 |
| |
