linux-kernel - Re: [RFC PATCH] ARM: dts: stm32f469-disco: use the same 3v3 for SD and DSI nodes

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Date:   Thu, 14 Sep 2023 10:56:59 +0200
From:   Alexandre TORGUE <alexandre.torgue@...s.st.com>
To:     Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        <linux-kernel@...r.kernel.org>
CC:     <linux-amarula@...rulasolutions.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [RFC PATCH] ARM: dts: stm32f469-disco: use the same 3v3 for SD
 and DSI nodes

On 9/4/23 20:06, Dario Binacchi wrote:
> In the board schematic, the power supply for the SD card is the same 3.3
> volts used to power the LCD panel and other peripherals. By generalizing
> the name of the voltage regulator, it simplifies the device tree and makes
> it more readable.
> 

It makes sens as it is the same discret regulator (no pmic involved).

regards
Alex

> Link: https://www.st.com/en/evaluation-tools/32f469idiscovery.html#cad-resources
> Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> 
> ---
> 
>   arch/arm/boot/dts/st/stm32f469-disco.dts | 15 ++++-----------
>   1 file changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/st/stm32f469-disco.dts b/arch/arm/boot/dts/st/stm32f469-disco.dts
> index cbbd521bf010..8a4f8ddd083d 100644
> --- a/arch/arm/boot/dts/st/stm32f469-disco.dts
> +++ b/arch/arm/boot/dts/st/stm32f469-disco.dts
> @@ -69,16 +69,9 @@ aliases {
>   		serial0 = &usart3;
>   	};
>   
> -	mmc_vcard: mmc_vcard {
> +	vcc_3v3: vcc-3v3 {
>   		compatible = "regulator-fixed";
> -		regulator-name = "mmc_vcard";
> -		regulator-min-microvolt = <3300000>;
> -		regulator-max-microvolt = <3300000>;
> -	};
> -
> -	vdd_dsi: vdd-dsi {
> -		compatible = "regulator-fixed";
> -		regulator-name = "vdd_dsi";
> +		regulator-name = "vcc_3v3";
>   		regulator-min-microvolt = <3300000>;
>   		regulator-max-microvolt = <3300000>;
>   	};
> @@ -164,7 +157,7 @@ panel@0 {
>   		compatible = "orisetech,otm8009a";
>   		reg = <0>; /* dsi virtual channel (0..3) */
>   		reset-gpios = <&gpioh 7 GPIO_ACTIVE_LOW>;
> -		power-supply = <&vdd_dsi>;
> +		power-supply = <&vcc_3v3>;
>   		status = "okay";
>   
>   		port {
> @@ -219,7 +212,7 @@ timer@2 {
>   
>   &sdio {
>   	status = "okay";
> -	vmmc-supply = <&mmc_vcard>;
> +	vmmc-supply = <&vcc_3v3>;
>   	cd-gpios = <&gpiog 2 GPIO_ACTIVE_LOW>;
>   	broken-cd;
>   	pinctrl-names = "default", "opendrain";