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

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Date:   Mon, 23 Oct 2023 13:00:48 +0200
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     Alexandre TORGUE <alexandre.torgue@...s.st.com>
Cc:     linux-kernel@...r.kernel.org, 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

Hello Alexandre,

On Thu, Sep 14, 2023 at 10:57 AM Alexandre TORGUE
<alexandre.torgue@...s.st.com> wrote:
>
> 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).
>

I don't see it applied to linux-stm32/next. Is something missing?

Thanks and regards,
Dario

> 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";
>


-- 

Dario Binacchi

Senior Embedded Linux Developer

dario.binacchi@...rulasolutions.com

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