linux-kernel - Re: [PATCH 8/8] drm/msm/dp: Support external GPIO HPD with 3rd pinctrl chip

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Message-ID: <b3f89c19-a6d6-40a0-9225-111cc59221a2@kernel.org>
Date: Fri, 29 Nov 2024 09:21:08 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Xiangxu Yin <quic_xiangxuy@...cinc.com>, Rob Clark <robdclark@...il.com>,
 Abhinav Kumar <quic_abhinavk@...cinc.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Kuogee Hsieh <quic_khsieh@...cinc.com>,
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski
 <brgl@...ev.pl>, quic_lliu6@...cinc.com, quic_fangez@...cinc.com
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
 linux-gpio@...r.kernel.org
Subject: Re: [PATCH 8/8] drm/msm/dp: Support external GPIO HPD with 3rd
 pinctrl chip

On 29/11/2024 08:57, Xiangxu Yin wrote:
>  
> +	if (of_find_property(pdev->dev.of_node, "dp-hpd-gpio", NULL)) {
> +		dp->ext_gpio = true;
> +		dp->gpio_num = of_get_named_gpio(pdev->dev.of_node, "dp-hpd-gpio", 0);
> +		if (dp->gpio_num < 0) {
> +			dev_err(&pdev->dev, "Failed to get gpio:%d\n", dp->gpio_num);
> +			return dp->gpio_num;
> +		}
> +
> +		if (!gpio_is_valid(dp->gpio_num)) {
> +			DRM_ERROR("gpio(%d) invalid\n", dp->gpio_num);
> +			return -EINVAL;
> +		}
> +
> +		rc = gpio_request(dp->gpio_num, "dp-hpd-gpio");
This is not how you request GPIOs. All this code is just wrong. See
Gpiolib API description/document. Or any other driver using GPIOs.

Best regards,
Krzysztof