linux-kernel - Re: [PATCH 03/22] clk: mediatek: Fix corner case of tuner_en

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Date:   Wed, 30 Jun 2021 19:09:40 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     Chun-Jie Chen <chun-jie.chen@...iatek.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, srv_heupstream@...iatek.com,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH 03/22] clk: mediatek: Fix corner case of tuner_en_reg

On Wed, Jun 30, 2021 at 6:53 PM Matthias Brugger <matthias.bgg@...il.com> wrote:
>
>
>
> On 30/06/2021 09:31, Chen-Yu Tsai wrote:
> > On Thu, Jun 17, 2021 at 7:01 AM Chun-Jie Chen
> > <chun-jie.chen@...iatek.com> wrote:
> >>
> >> On MT8195, tuner_en_reg is moved to register offest 0x0.
> >> If we only judge by tuner_en_reg, it may lead to wrong address.
> >> Add tuner_en_bit to the check condition. And it has been confirmed,
> >> on all the MediaTek SoCs, bit0 of offset 0x0 is always occupied by
> >> clock square control.
> >>
> >> Signed-off-by: Chun-Jie Chen <chun-jie.chen@...iatek.com>
> >
> > Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
> >
> > Though you might want to consider converting these types of checks into feature
> > flags.
> >
>
> Yes I think adding a feature flag is the way to go. Luckily there are only a few
> SoCs that will need updates at the same time.

I also see that the different clock modules are tied together using only clock
names written in the drivers, instead of clock references in the device tree.

Unfortunately reworking this would likely require a lot more work. I previously
did a bit of internal reworking for the sunxi drivers. While not the same, I
think the plumbing required is comparable.

ChenYu