linux-kernel - Re: [PATCH v4 07/10] clk: starfive: Add StarFive JH7110 Video-Output clock driver

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Date:   Thu, 13 Apr 2023 14:52:44 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Stephen Boyd <sboyd@...nel.org>
CC:     Conor Dooley <conor@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Xingyu Wu <xingyu.wu@...rfivetech.com>,
        <devicetree@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Hal Feng <hal.feng@...rfivetech.com>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v4 07/10] clk: starfive: Add StarFive JH7110 Video-Output
 clock driver

On Wed, Apr 12, 2023 at 09:04:08PM -0700, Stephen Boyd wrote:
> Quoting Xingyu Wu (2023-04-11 23:15:26)
> > On 2023/4/12 2:33, Stephen Boyd wrote:
> > > Quoting Xingyu Wu (2023-04-11 06:55:55)

> > >> +       if (ret < 0)
> > >> +               return dev_err_probe(priv->dev, ret, "failed to turn on power\n");
> > >> +
> > >> +       ret = jh7110_vout_top_crg_init(priv, top);
> > >> +       if (ret)
> > >> +               goto err_clk;
> > >> +
> > >> +       top->base = priv->base;
> > >> +       dev_set_drvdata(priv->dev, (void *)(&top->base));
> > > 
> > > See comment later about setting this to 'top' instead. Casting away
> > > iomem markings is not good hygiene.
> > 
> > JH7110 resets as the auxiliary device of clocks use the same iomem as the clocks
> > and the iomem will be got by dev_get_drvdata() in the 7110 reset drivers when registering reset.
> > So I follow the basic 7110 reset driver and also set the iomem not top_crg struct.
> 
> Oh I totally missed that this is how it's been done for the other
> starfive driver. It's still not good hygiene to stash the iomem pointer
> that way because the iomem marking is lost and has to be recovered. Can
> you make a wrapper struct, either for the adev or to pass in struct
> device::platform_data?

FWIW, this did come up on an earlier version of the other starfive
driver:
https://lore.kernel.org/linux-clk/e0d8f9ba-5bf4-d7dd-5110-20d4196556f9@starfivetech.com/

I probably should've pushed Hal to use a struct, but evidently I didn't
reply to his final message there, so apologies for that!


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