linux-kernel - Re: [RESEND PATCH v2 2/6] ARM: dts: stm32: add pin map for LTDC on stm32f7

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Message-ID: <CABGWkvoRZqQsEmpNRhhrRUrf+WHebErPO9Jt2L9bsNL_EKeoHg@mail.gmail.com>
Date:   Fri, 9 Jun 2023 08:21:18 +0200
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     Alexandre TORGUE <alexandre.torgue@...s.st.com>
Cc:     linux-kernel@...r.kernel.org,
        Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>,
        linux-arm-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org,
        Philippe Cornu <philippe.cornu@...s.st.com>,
        Amarula patchwork <linux-amarula@...rulasolutions.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        michael@...rulasolutions.com,
        linux-stm32@...md-mailman.stormreply.com,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [RESEND PATCH v2 2/6] ARM: dts: stm32: add pin map for LTDC on stm32f7

Hi Alexandre,

On Thu, Jun 8, 2023 at 2:42 PM Alexandre TORGUE
<alexandre.torgue@...s.st.com> wrote:
>
> Hi Dario
>
> On 6/7/23 08:31, Dario Binacchi wrote:
> > Add pin configurations for using LTDC (LCD-tft Display Controller) on
> > stm32f746-disco board.
> >
> > Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> > ---
> >
> > (no changes since v1)
> >
> >   arch/arm/boot/dts/stm32f7-pinctrl.dtsi | 35 ++++++++++++++++++++++++++
> >   1 file changed, 35 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/stm32f7-pinctrl.dtsi b/arch/arm/boot/dts/stm32f7-pinctrl.dtsi
> > index 9f65403295ca..f3f90b9bcd61 100644
> > --- a/arch/arm/boot/dts/stm32f7-pinctrl.dtsi
> > +++ b/arch/arm/boot/dts/stm32f7-pinctrl.dtsi
> > @@ -365,6 +365,41 @@ pins2 {
> >                                       bias-pull-up;
> >                               };
> >                       };
> > +
> > +
> > +                     ltdc_pins_a: ltdc-pins-a-0 {
>
>   ltdc-pins-a-0 -->  ltdc-pins-0 is a bit cleaner. I know that I have to
> fix sdio pins nodes in this file to keep the same spirit for all group
> names.

I have looked at the file arch/arm/boot/dts/stm32f7-pinctrl.dtsi, and
based on the following nodes:
usart1_pins_a: usart1-0
i2c1_pins_b: i2c1-0
can1_pins_a: can1-0

I have decided to rename ltdc-pins-a-0 to ltdc-0.

I hope you agree.

Thanks and regards,

Dario

>
> If there is no V3 I wil do it directly when I'll apply DT patches if you
> agree.
>
> Alex
>
>
> > +                             pins {
> > +                                     pinmux = <STM32_PINMUX('E', 4, AF14)>, /* LCD_B0 */
> > +                                              <STM32_PINMUX('G',12, AF9)>,  /* LCD_B4 */
> > +                                              <STM32_PINMUX('I', 9, AF14)>, /* LCD_VSYNC */
> > +                                              <STM32_PINMUX('I',10, AF14)>, /* LCD_HSYNC */
> > +                                              <STM32_PINMUX('I',14, AF14)>, /* LCD_CLK */
> > +                                              <STM32_PINMUX('I',15, AF14)>, /* LCD_R0 */
> > +                                              <STM32_PINMUX('J', 0, AF14)>, /* LCD_R1 */
> > +                                              <STM32_PINMUX('J', 1, AF14)>, /* LCD_R2 */
> > +                                              <STM32_PINMUX('J', 2, AF14)>, /* LCD_R3 */
> > +                                              <STM32_PINMUX('J', 3, AF14)>, /* LCD_R4 */
> > +                                              <STM32_PINMUX('J', 4, AF14)>, /* LCD_R5 */
> > +                                              <STM32_PINMUX('J', 5, AF14)>, /* LCD_R6 */
> > +                                              <STM32_PINMUX('J', 6, AF14)>, /* LCD_R7 */
> > +                                              <STM32_PINMUX('J', 7, AF14)>, /* LCD_G0 */
> > +                                              <STM32_PINMUX('J', 8, AF14)>, /* LCD_G1 */
> > +                                              <STM32_PINMUX('J', 9, AF14)>, /* LCD_G2 */
> > +                                              <STM32_PINMUX('J',10, AF14)>, /* LCD_G3 */
> > +                                              <STM32_PINMUX('J',11, AF14)>, /* LCD_G4 */
> > +                                              <STM32_PINMUX('J',13, AF14)>, /* LCD_B1 */
> > +                                              <STM32_PINMUX('J',14, AF14)>, /* LCD_B2 */
> > +                                              <STM32_PINMUX('J',15, AF14)>, /* LCD_B3 */
> > +                                              <STM32_PINMUX('K', 0, AF14)>, /* LCD_G5 */
> > +                                              <STM32_PINMUX('K', 1, AF14)>, /* LCD_G6 */
> > +                                              <STM32_PINMUX('K', 2, AF14)>, /* LCD_G7 */
> > +                                              <STM32_PINMUX('K', 4, AF14)>, /* LCD_B5 */
> > +                                              <STM32_PINMUX('K', 5, AF14)>, /* LCD_B6 */
> > +                                              <STM32_PINMUX('K', 6, AF14)>, /* LCD_B7 */
> > +                                              <STM32_PINMUX('K', 7, AF14)>; /* LCD_DE */
> > +                                     slew-rate = <2>;
> > +                             };
> > +                     };
> >               };
> >       };
> >   };
>


-- 

Dario Binacchi

Senior Embedded Linux Developer

dario.binacchi@...rulasolutions.com

__________________________________


Amarula Solutions SRL

Via Le Canevare 30, 31100 Treviso, Veneto, IT

T. +39 042 243 5310
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