diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2015-08-04 16:55:15 +0300 |
|---|---|---|
| committer | Simon Horman <horms+renesas@verge.net.au> | 2015-08-05 00:39:28 +0300 |
| commit | 09d1c7b4babd3ef9bfc0a148931e5e5702db5e1b (patch) | |
| tree | 4396f58afa088eee74c550bcdd59602ba2103f5d /arch/arm/boot/dts/r8a7740.dtsi | |
| parent | 17ccec50cc40bef00b26d506d483e928804cb20e (diff) | |
| download | linux-09d1c7b4babd3ef9bfc0a148931e5e5702db5e1b.tar.xz | |
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>
Diffstat (limited to 'arch/arm/boot/dts/r8a7740.dtsi')
| -rw-r--r-- | arch/arm/boot/dts/r8a7740.dtsi | 1 |
1 files changed, 1 insertions, 0 deletions
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>, |