linux-kernel - Re: [PATCH 2/4] arm64: dts: mediatek: mt8192: Fix systimer 13 MHz clock description

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Message-ID: <4e73921f-c8c1-7943-72a7-a95b20a68bbf@collabora.com>
Date:   Tue, 13 Dec 2022 12:25:14 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>
Subject: Re: [PATCH 2/4] arm64: dts: mediatek: mt8192: Fix systimer 13 MHz
 clock description

Il 01/12/22 09:42, Chen-Yu Tsai ha scritto:
> The systimer block derives its 13 MHz clock by dividing the main 26 MHz
> oscillator clock by 2 internally, not through the TOPCKGEN clock
> controller.
> 
> On the MT8192 this divider is fixed to /2 and is not configurable.
> 
> Making the systimer block take the 26 MHz clock directly requires
> changing the implementations. As an ABI compatible fix, change the
> input clock of the systimer block a fixed factor divide-by-2 clock
> that takes the 26 MHz oscillator as its input.
> 
> Fixes: 48489980e27e ("arm64: dts: Add Mediatek SoC MT8192 and evaluation board dts and Makefile")
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>

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