linux-kernel - Re: [PATCH v2] arm64: dts: mediatek: mt8188-geralt: Enable first SCP core

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Message-ID: <f613c223-a2ae-4092-8361-0396ace8df99@collabora.com>
Date: Wed, 15 Oct 2025 10:31:55 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Chen-Yu Tsai <wenst@...omium.org>
Cc: Matthias Brugger <matthias.bgg@...il.com>,
 linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Fei Shao <fshao@...omium.org>
Subject: Re: [PATCH v2] arm64: dts: mediatek: mt8188-geralt: Enable first SCP
 core

Il 15/10/25 09:31, Chen-Yu Tsai ha scritto:
> On Tue, Oct 14, 2025 at 9:27 PM AngeloGioacchino Del Regno
> <angelogioacchino.delregno@...labora.com> wrote:
>>
>> Il 14/08/25 11:25, Chen-Yu Tsai ha scritto:
>>> The first SCP core is used to drive the video decoder and encoders.
>>>
>>> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
>>> ---
>>> Changes since v1:
>>> - Added SCP vreq pin
>>> ---
>>>    .../boot/dts/mediatek/mt8188-geralt.dtsi      | 25 +++++++++++++++++++
>>>    1 file changed, 25 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi b/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi
>>> index c5254ae0bb99..7fedbacdac44 100644
>>> --- a/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi
>>> +++ b/arch/arm64/boot/dts/mediatek/mt8188-geralt.dtsi
>>> @@ -164,6 +164,12 @@ reserved_memory: reserved-memory {
>>>                #size-cells = <2>;
>>>                ranges;
>>>
>>> +             scp_mem_reserved: memory@...00000 {
>>> +                     compatible = "shared-dma-pool";
>>> +                     reg = <0 0x50000000 0 0x800000>;
>>> +                     no-map;
>>> +             };
>>> +
>>>                apu_mem: memory@...00000 {
>>>                        compatible = "shared-dma-pool";
>>>                        reg = <0 0x55000000 0 0x1400000>;
>>> @@ -1077,6 +1083,13 @@ pins-bus {
>>>                };
>>>        };
>>>
>>> +     scp_pins: scp-pins {
>>> +             pins-scp-vreq {
>>> +                     pinmux = <PINMUX_GPIO98__FUNC_O_SCP_VREQ_VAO>;
>>> +                     bias-disable;
>>> +             };
>>> +     };
>>> +
>>>        spi0_pins: spi0-pins {
>>>                pins-bus {
>>>                        pinmux = <PINMUX_GPIO69__FUNC_O_SPIM0_CSB>,
>>> @@ -1146,6 +1159,18 @@ &postmask0_out {
>>>        remote-endpoint = <&dither0_in>;
>>>    };
>>>
>>> +&scp_cluster {
>>> +     status = "okay";
>>> +};
>>> +
>>> +&scp_c0 {
>>> +     pinctrl-names = "default";
>>> +     pinctrl-0 = <&scp_pins>;
>>> +     firmware-name = "mediatek/mt8188/scp.img";
>>
>> After a (very brief) discussion with Arnd last time, turns out we decided to avoid
>> using the firmware-name property, including for mtk-scp.
>>
>> Please resend without firmware-name.
>>
>> P.S.: there's a patch to construct the firmware name from compatible...
>> https://lore.kernel.org/r/20250911140043.190801-1-angelogioacchino.delregno@collabora.com
> 
> I'm aware of the patch, but did that get merged?

Not yet.

 >> If not then this would
> cause it to default to just /lib/firmware/scp.img?

Yes... but there's no way around it, we can't add firmware-name to devicetrees.

> 
> ChenYu
> 
>> Cheers,
>> Angelo
>>
>>> +     memory-region = <&scp_mem_reserved>;
>>> +     status = "okay";
>>> +};
>>> +
>>>    &sound {
>>>        pinctrl-names = "aud_etdm_hp_on", "aud_etdm_hp_off",
>>>                        "aud_etdm_spk_on", "aud_etdm_spk_off",
>>
>>