linux-kernel - Re: [PATCH v2 3/9] spi: mtk-snfi: Add optional nfi

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Message-ID: <ef2e6859-56e1-bbf0-dbde-44ea3d7d2f3f@collabora.com>
Date:   Mon, 5 Dec 2022 15:21:35 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Xiangsheng Hou <xiangsheng.hou@...iatek.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Chuanhong Guo <gch981213@...il.com>
Cc:     linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, benliang.zhao@...iatek.com,
        bin.zhang@...iatek.com
Subject: Re: [PATCH v2 3/9] spi: mtk-snfi: Add optional nfi_hclk which needed
 for MT7986

Il 05/12/22 07:57, Xiangsheng Hou ha scritto:
> Add optional nfi_hclk which needed for MT7986.
> 
> Signed-off-by: Xiangsheng Hou <xiangsheng.hou@...iatek.com>

Is there any operation for which you need NFI_HCLK enabled, but at the same time
PAD_CLK and/or NFI_CLK can be disabled?

If NFI_HCLK and NFI_CLK must always be ON at the same time, adding this clock to
spi-mtk-snfi.c is *not* an optimal way of doing things: you can, at this point,
set NFI_HCLK as parent of NFI_CLK in the MT7986 clock driver instead, without
making any addition to this driver at all.

Regards,
Angelo