On 08/24/2016 04:25 AM, 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 at 14530000[0]'
>
> Use the preferred property, 'hpd-gpios' instead of 'hpd-gpio'.
>
> Acked-by: Rob Herring <robh at kernel.org>
> Cc: Kukjin Kim <kgene at kernel.org>
> Cc: Krzysztof Kozlowski <k.kozlowski at samsung.com>
> Cc: David Airlie <airlied at linux.ie>
> Cc: Inki Dae <inki.dae at samsung.com>
> Cc: Joonyoung Shim <jy0922.shim at samsung.com>
> Cc: Seung-Woo Kim <sw0312.kim at samsung.com>
> Cc: Kyungmin Park <kyungmin.park at samsung.com>
> Cc: devicetree at vger.kernel.org
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: linux-samsung-soc at vger.kernel.org
> Cc: linux-kernel at vger.kernel.org
> Cc: dri-devel at lists.freedesktop.org
> Signed-off-by: Milo Kim <woogyom.kim at gmail.com>
I am not sure if this long Cc list is necessary.
Anyway:
Reviewed-by: Andrzej Hajda <a.hajda at samsung.com>
--
Regards
Andrzej
