On Tue, Aug 23, 2016 at 06:13:37PM +0900, Milo Kim wrote:
> This patch enables getting a HPD GPIO descriptor quickly.
> The exynos-hdmi driver uses "hpd" for HDMI hot plug detection.
>
> static int hdmi_resources_init(struct hdmi_context *hdata)
> {
> ...
> hdata->hpd_gpio = devm_gpiod_get(dev, "hpd", GPIOD_IN);
> ...
> }
>
> This calls 'of_find_gpio()' and it generates the GPIO consumer ID by referring
> GPIO suffix. So 'hpd-gpios' is preferred on getting a GPIO descriptor.
>
> However, if the device tree uses 'hpd-gpio', then the exynos-hdmi driver
> always retries to get a GPIO descriptor because the first GPIO suffix is not
> 'gpio' but 'gpios'. So you always see the debug message below.
>
> of_get_named_gpiod_flags: can't parse 'hpd-gpios' property of node '/soc/hdmi@14530000[0]'
>
> Use the preferred property, 'hpd-gpios' instead of 'hpd-gpio'.
>
> Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
> Cc: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
> Cc: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-samsung-soc@xxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Milo Kim <woogyom.kim@xxxxxxxxx>
> ---
> Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt | 4 ++--
> arch/arm/boot/dts/exynos4210-universal_c210.dts | 2 +-
> arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 2 +-
> arch/arm/boot/dts/exynos5250-arndale.dts | 2 +-
> arch/arm/boot/dts/exynos5250-smdk5250.dts | 2 +-
> arch/arm/boot/dts/exynos5250-snow-common.dtsi | 2 +-
> arch/arm/boot/dts/exynos5250-spring.dts | 2 +-
> arch/arm/boot/dts/exynos5420-peach-pit.dts | 2 +-
> arch/arm/boot/dts/exynos5420-smdk5420.dts | 2 +-
> arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 2 +-
> arch/arm/boot/dts/exynos5800-peach-pi.dts | 2 +-
> 11 files changed, 12 insertions(+), 12 deletions(-)
Acked-by: Rob Herring <robh@xxxxxxxxxx>
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