linux-kernel - Re: [PATCH v3 2/5] ARM: dts: exynos: Use 'hpd-gpios' instead of 'hpd-gpio'

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Date:   Wed, 24 Aug 2016 21:13:00 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Milo Kim <woogyom.kim@...il.com>
Cc:     Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <k.kozlowski@...sung.com>,
        David Airlie <airlied@...ux.ie>, devicetree@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Inki Dae <inki.dae@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 2/5] ARM: dts: exynos: Use 'hpd-gpios' instead of
 'hpd-gpio'

On Wed, Aug 24, 2016 at 10:07:16PM +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@...30000[0]'
>

Thanks for fixing this, applied!

BR,
Krzysztof