linux-kernel - Re: [PATCH v2 1/2] arm64: dts: mediatek: mt8186: Add missing clocks to ssusb power domains

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Message-ID: <c8878258-9f3b-4e2f-a022-3bd43bcfd02e@collabora.com>
Date: Wed, 14 Feb 2024 10:03:28 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 Matthias Brugger <matthias.bgg@...il.com>
Cc: Chen-Yu Tsai <wenst@...omium.org>,
 Eugen Hristev <eugen.hristev@...labora.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Allen-KH Cheng <allen-kh.cheng@...iatek.com>, kernel@...labora.com,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] arm64: dts: mediatek: mt8186: Add missing clocks
 to ssusb power domains

Il 13/02/24 16:02, Nícolas F. R. A. Prado ha scritto:
> The ssusb power domains currently don't list any clocks, despite
> depending on some, and thus rely on the bootloader leaving the required
> clocks on in order to work.
> 
> When booting with the upstream arm64 defconfig, the power domain
> controller will defer probe until modules have loaded since it has an
> indirect dependency on CONFIG_MTK_CMDQ, which is configured as a module.
> However at the point where modules are loaded, unused clocks are also
> disabled, causing the ssusb domains to fail to be enabled and
> consequently the controller to fail probe:
> 
> mtk-power-controller 10006000.syscon:power-controller: /soc/syscon@...06000/power-controller/power-domain@4: failed to power on domain: -110
> mtk-power-controller: probe of 10006000.syscon:power-controller failed with error -110
> 
> Add the missing clocks for the ssusb power domains so that they can
> successfully probe without relying on the bootloader state.
> 
> Fixes: d9e43c1e7a38 ("arm64: dts: mt8186: Add power domains controller")
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>