linux-kernel - Re: [PATCH v1 14/14] ARM: dts: imx6ull-uti260b: Add board

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Date: Tue, 13 Feb 2024 09:52:36 +0100
From: Stefan Wahren <wahrenst@....net>
To: Sebastian Reichel <sre@...nel.org>
Cc: Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>, Fabio Estevam <festevam@...il.com>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 NXP Linux Team <linux-imx@....com>, Dong Aisheng <aisheng.dong@....com>,
 Linus Walleij <linus.walleij@...aro.org>,
 Dmitry Torokhov <dmitry.torokhov@...il.com>, Mark Brown
 <broonie@...nel.org>, linux-arm-kernel@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 14/14] ARM: dts: imx6ull-uti260b: Add board

>>> +&ecspi3 {
>>> +	cs-gpios = <&gpio1 20 GPIO_ACTIVE_LOW>;
>>> +	pinctrl-names = "default";
>>> +	pinctrl-0 = <&mux_spi3>, <&mux_spi3_cs>;
>>> +	status = "okay";
>>> +
>>> +	panel@0 {
>>> +		compatible = "inanbo,t28cp45tn89-v17";
>>> +		reg = <0>;
>>> +		backlight = <&panel_backlight>;
>>> +		power-supply = <&reg_vsd>;
>>> +		spi-cpha;
>>> +		spi-cpol;
>>> +		spi-max-frequency = <100000>;
>> This seems slow to me. Is this a limitation of the display?
> I just used something slow, which should definitely work. I will try
> to increase to 1MHz. Note, that the display is not driven via SPI.
> SPI is just used for the configuration.
Thanks for clarification. Yes, 1 MHz would be better.
>
> Thanks for the review,
>
> -- Sebastian