linux-kernel - Re: [PATCH 3/5] gpu: drm: adp: Add a backlight driver for the Summit LCD

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Message-ID: <f2181c71-db23-4d94-9afb-cb8f2fc46bea@kernel.org>
Date: Mon, 25 Nov 2024 15:49:55 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: fnkl.kernel@...il.com, Hector Martin <marcan@...can.st>,
 Sven Peter <sven@...npeter.dev>, Alyssa Rosenzweig <alyssa@...enzweig.io>,
 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>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Jessica Zhang <quic_jesszhan@...cinc.com>, asahi@...ts.linux.dev
Cc: linux-arm-kernel@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Nick Chan <towinchenmi@...il.com>
Subject: Re: [PATCH 3/5] gpu: drm: adp: Add a backlight driver for the Summit
 LCD

On 24/11/2024 23:29, Sasha Finkelstein via B4 Relay wrote:
> From: Sasha Finkelstein <fnkl.kernel@...il.com>
> 
> This is the display panel used for the touchbar on laptops that have it.


...


> +static int summit_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct backlight_properties props = { 0 };
> +	struct device *dev = &dsi->dev;
> +	struct summit_data *panel;
> +
> +	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
> +	if (!panel)
> +		return -ENOMEM;
> +
> +	mipi_dsi_set_drvdata(dsi, panel);
> +	panel->dsi = dsi;
> +
> +	int ret = device_property_read_u32(dev, "max-brightness", &props.max_brightness);
That's an undocumented property, which suggests you did not test your DTS.

It does not look like you tested the DTS against bindings. Please run
`make dtbs_check W=1` (see
Documentation/devicetree/bindings/writing-schema.rst or
https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
for instructions).

Best regards,
Krzysztof