linux-kernel - Re: [PATCH v2 19/66] media: sun6i-csi: Grab bus clock instead of passing it to regmap

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Message-ID: <20220209092035.tz5ctosidpib47fq@houat>
Date:   Wed, 9 Feb 2022 10:20:35 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-staging@...ts.linux.dev,
        Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Helen Koike <helen.koike@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 19/66] media: sun6i-csi: Grab bus clock instead of
 passing it to regmap

Hi,

On Sat, Feb 05, 2022 at 07:53:42PM +0100, Paul Kocialkowski wrote:
> Since the bus clock alone is not enough to get access to the registers,
> don't pass it to regmap and manage it instead just like the other
> clocks.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

I'm not really sure about this one.

Sure, there's more resources involved than the clock to get access to
the registers (like reset), but you can't have a functional device
without the reset line deasserted.

You can however have a functional device without the bus clock enabled,
so it just seems much better to let regmap manage it.

Unless there's a drawback to it of course, but it should be in your
commit log if so.

Maxime

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