linux-kernel - Re: [Linux-stm32] [PATCH 09/12] arm64: dts: st: add lvds support on stm32mp255

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <a00bb4e2-b0e8-44ef-bf14-5e4f5e60f9d0@foss.st.com>
Date: Fri, 25 Jul 2025 13:13:22 +0200
From: Clement LE GOFFIC <clement.legoffic@...s.st.com>
To: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>,
        Yannick Fertre
	<yannick.fertre@...s.st.com>,
        Philippe Cornu <philippe.cornu@...s.st.com>,
        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>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre
 Torgue <alexandre.torgue@...s.st.com>,
        Catalin Marinas
	<catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Christophe Roullier
	<christophe.roullier@...s.st.com>
CC: <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [Linux-stm32] [PATCH 09/12] arm64: dts: st: add lvds support on
 stm32mp255

On 7/25/25 13:08, Clement LE GOFFIC wrote:
> Hi Raphael,
> 
> On 7/25/25 12:04, Raphael Gallais-Pou wrote:
>> The LVDS is used on STM32MP2 as a display interface.
>>
>> Add the LVDS node.
>>
>> Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
>> ---
>>   arch/arm64/boot/dts/st/stm32mp255.dtsi | 12 ++++++++++++
>>   1 file changed, 12 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/st/stm32mp255.dtsi b/arch/arm64/boot/ 
>> dts/st/stm32mp255.dtsi
>> index 
>> f689b47c5010033120146cf1954d6624c0270045..a4d965f785fa42c4597494010855aec7e1b9fdd1 100644
>> --- a/arch/arm64/boot/dts/st/stm32mp255.dtsi
>> +++ b/arch/arm64/boot/dts/st/stm32mp255.dtsi
>> @@ -6,6 +6,18 @@
>>   #include "stm32mp253.dtsi"
>>   &rifsc {
>> +    lvds: lvds@...60000 {
>> +        compatible = "st,stm32mp25-lvds";
> 
> For the compatible you now need one comaptible per SoC.
> It means your compatible should look like : "st,stm32mp251-lvds".
> This way, if on the 253 or 255 there is an issue you are able to easily 
> add match data in the driver with compatible "st,stm32mp253-lvds" or 
> "st,stm32mp255-lvds".
> A prior discussion on this subject has been raised on my V1 of HDP 
> involving Krzysztof and Alexandre :
> https://lore.kernel.org/all/418a80a9-8c08-4dd1- 
> bf49-1bd7378321aa@...nel.org/
Woops, this comment should target the add of the ltdc compatible as I 
see that lvds one already exists and can't be changed.
Though the main idea is here.

> 
>> +        #clock-cells = <0>;
>> +        reg = <0x48060000 0x2000>;
>> +        clocks = <&rcc CK_BUS_LVDS>, <&rcc CK_KER_LVDSPHY>;
>> +        clock-names = "pclk", "ref";
>> +        resets = <&rcc LVDS_R>;
>> +        access-controllers = <&rifsc 84>;
>> +        power-domains = <&CLUSTER_PD>;
>> +        status = "disabled";
>> +    };
>> +
>>       vdec: vdec@...d0000 {
>>           compatible = "st,stm32mp25-vdec";
>>           reg = <0x480d0000 0x3c8>;
>>
> 
> Best regards,
> Clément