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Subject: Re: [PATCH v3 3/5] ARM: dts: stm32: enable ltdc binding with ili9341
 on stm32429-disco board
To:     Linus Walleij <linus.walleij@linaro.org>, <dillon.minfei@gmail.com>
CC:     Rob Herring <robh+dt@kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        "thierry.reding@gmail.com" <thierry.reding@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        Dave Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@lists.freedesktop.org>,
        linux-clk <linux-clk@vger.kernel.org>
References: <1589267017-17294-1-git-send-email-dillon.minfei@gmail.com>
 <1589267017-17294-4-git-send-email-dillon.minfei@gmail.com>
 <CACRpkda5VjjBdbruXTi33QBNb=VU6vK2zDE8yyQXoWw7=NQFeg@mail.gmail.com>
From:   Alexandre Torgue <alexandre.torgue@st.com>
Message-ID: <a4ebd7cd-5756-0683-135f-0f96be8a4a7b@st.com>
Date:   Thu, 14 May 2020 14:52:49 +0200
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On 5/14/20 10:24 AM, Linus Walleij wrote:
> On Tue, May 12, 2020 at 9:04 AM <dillon.minfei@gmail.com> wrote:
> 
>> From: dillon min <dillon.minfei@gmail.com>
>>
>> Enable the ltdc & ili9341 on stm32429-disco board.
>>
>> Signed-off-by: dillon min <dillon.minfei@gmail.com>
> 
> This mostly looks good but...
> 
>> +&spi5 {
>> +       status = "okay";
>> +       pinctrl-0 = <&spi5_pins>;
>> +       pinctrl-names = "default";
>> +       #address-cells = <1>;
>> +       #size-cells = <0>;
>> +       cs-gpios = <&gpioc 2 GPIO_ACTIVE_LOW>;
>> +       dmas = <&dma2 3 2 0x400 0x0>,
>> +              <&dma2 4 2 0x400 0x0>;
>> +       dma-names = "rx", "tx";
> 
> These DMA assignments seem to be SoC things and should
> rather be in the DTS(I) file where &spi5 is defined, right?
> stm32f429.dtsi I suppose?

I agree with Linus, DMA have to be defined in SoC dtsi. And if a board 
doesn't want to use it, we use the "delete-property".

> 
> It is likely the same no matter which device is using spi5.
> 
> Yours,
> Linus Walleij
>