linux-kernel - Re: [PATCH v2 2/5] clk: mediatek: Refactor pll registration to pass device

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Message-ID: <ad744447-a871-43b8-aac1-128d4cfb8c47@collabora.com>
Date: Thu, 9 Oct 2025 10:52:30 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Chen-Yu Tsai <wenst@...omium.org>
Cc: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Dong Aisheng <aisheng.dong@....com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 Yassine Oudjana <y.oudjana@...tonmail.com>,
 Laura Nao <laura.nao@...labora.com>,
 Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 Chia-I Wu <olvaffe@...il.com>, kernel@...labora.com,
 linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v2 2/5] clk: mediatek: Refactor pll registration to pass
 device

Il 09/10/25 10:18, Chen-Yu Tsai ha scritto:
> On Thu, Oct 9, 2025 at 4:09 PM AngeloGioacchino Del Regno
> <angelogioacchino.delregno@...labora.com> wrote:
>>
>> Il 08/10/25 18:05, Nicolas Frattaroli ha scritto:
>>> As it stands, mtk_clk_register_plls takes a struct device_node pointer
>>> as its first argument. This is a tragic happenstance, as it's trivial to
>>> get the device_node from a struct device, but the opposite not so much.
>>> The struct device is a much more useful thing to have passed down.
>>>
>>> Refactor mtk_clk_register_plls to take a struct device pointer instead
>>> of a struct device_node pointer, and fix up all users of this function.
>>>
>>> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
>>> ---
>>>    drivers/clk/mediatek/clk-mt2701.c            | 2 +-
>>>    drivers/clk/mediatek/clk-mt2712-apmixedsys.c | 2 +-
>>>    drivers/clk/mediatek/clk-mt6735-apmixedsys.c | 4 ++--
>>>    drivers/clk/mediatek/clk-mt6765.c            | 2 +-
>>>    drivers/clk/mediatek/clk-mt6779.c            | 2 +-
>>>    drivers/clk/mediatek/clk-mt6797.c            | 2 +-
>>>    drivers/clk/mediatek/clk-mt7622-apmixedsys.c | 2 +-
>>>    drivers/clk/mediatek/clk-mt7629.c            | 2 +-
>>>    drivers/clk/mediatek/clk-mt7981-apmixed.c    | 2 +-
>>>    drivers/clk/mediatek/clk-mt7986-apmixed.c    | 2 +-
>>>    drivers/clk/mediatek/clk-mt7988-apmixed.c    | 2 +-
>>>    drivers/clk/mediatek/clk-mt8135-apmixedsys.c | 3 ++-
>>>    drivers/clk/mediatek/clk-mt8167-apmixedsys.c | 2 +-
>>>    drivers/clk/mediatek/clk-mt8183-apmixedsys.c | 2 +-
>>>    drivers/clk/mediatek/clk-mt8188-apmixedsys.c | 2 +-
>>>    drivers/clk/mediatek/clk-mt8195-apusys_pll.c | 3 ++-
>>>    drivers/clk/mediatek/clk-mt8196-apmixedsys.c | 3 ++-
>>>    drivers/clk/mediatek/clk-mt8196-mcu.c        | 2 +-
>>>    drivers/clk/mediatek/clk-mt8196-mfg.c        | 2 +-
>>>    drivers/clk/mediatek/clk-mt8196-vlpckgen.c   | 2 +-
>>>    drivers/clk/mediatek/clk-mt8365-apmixedsys.c | 2 +-
>>>    drivers/clk/mediatek/clk-mt8516-apmixedsys.c | 2 +-
>>>    drivers/clk/mediatek/clk-pll.c               | 7 ++++---
>>>    drivers/clk/mediatek/clk-pll.h               | 6 +++---
>>>    24 files changed, 33 insertions(+), 29 deletions(-)
>>>
>>
>> ..snip..
>>
>>> diff --git a/drivers/clk/mediatek/clk-pll.h b/drivers/clk/mediatek/clk-pll.h
>>> index d71c150ce83e4bb2fe78290c2d5570a90084246d..0e2b94b9cd4b56adceee3b04e9ab24c2526471da 100644
>>> --- a/drivers/clk/mediatek/clk-pll.h
>>> +++ b/drivers/clk/mediatek/clk-pll.h
>>> @@ -78,9 +78,9 @@ struct mtk_clk_pll {
>>>        const struct mtk_pll_data *data;
>>>    };
>>>
>>
>> There's a forward declaration of struct device_node in this header: with this
>> change, that becomes unused.
>>
>> Please change that to a forward declaration of struct device instead.
>>
>> While at it, I'd appreciate if you could either:
>>    A. Remove the forward declaration for `struct clk_hw_onecell_data` and for
>>       `struct clk_ops` (as both come from clk-provider.h - which this already
>>        includes);
>>      ...or...
>>    B. Remove the inclusion of clk-provider.h and keep the forward declarations.
> 
> Prefer (B) since no APIs from clk-provider.h are referenced in the header.
> It is up to the implementation to directly include any and all headers it
> needs.
> 

Me too. Also because other drivers are doing that.
I didn't have strong opinions about this anyway, so I didn't want to influence the
decision too much - but at this point I just said it so I could've said it before
anyway :-P

Angelo

> ChenYu
> 
>> After which:
>>
>> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>>
>>> -int mtk_clk_register_plls(struct device_node *node,
>>> -                       const struct mtk_pll_data *plls, int num_plls,
>>> -                       struct clk_hw_onecell_data *clk_data);
>>> +int mtk_clk_register_plls(struct device *dev, const struct mtk_pll_data *plls,
>>> +                       int num_plls, struct clk_hw_onecell_data *clk_data);
>>> +
>>>    void mtk_clk_unregister_plls(const struct mtk_pll_data *plls, int num_plls,
>>>                             struct clk_hw_onecell_data *clk_data);
>>>
>>>
>>
>>


-- 
AngeloGioacchino Del Regno
Senior Software Engineer

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