Re: [PATCH v2 3/9] spi: mtk-snfi: Add optional nfi_hclk which needed for MT7986

[Xiangsheng Hou (侯祥胜) <Xiangsheng.Hou@xxxxxxxxxxxx>]

Hi Angelo,

On Mon, 2022-12-05 at 15:21 +0100, AngeloGioacchino Del Regno wrote:
> 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@xxxxxxxxxxxx>
> 
> 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?

No, for the new IP design on MT7986, will need the
PAD_CLK/NFI_CLK/NFI_HCLK enabled at the same time.

> 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.

For some IC, there may have only NFI_CLK/PAD_CLK, and have no NFI_HCLK,
this rely on IC design.

Thanks
Xiangsheng Hou