linux-kernel - Re: [PATCH 1/3] clk: renesas: rzv2h-cpg: Move PLL access macros to source file

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Message-ID: <CAMuHMdVfnGhaJwfK93_StWsUDWDfwNp_9uwZB6VvKLMMNga9tg@mail.gmail.com>
Date: Wed, 5 Mar 2025 18:11:56 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc: Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, 
	linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 1/3] clk: renesas: rzv2h-cpg: Move PLL access macros to
 source file

Hi Prabhakar,

On Wed, 5 Mar 2025 at 17:38, Lad, Prabhakar <prabhakar.csengg@...il.com> wrote:
> On Wed, Mar 5, 2025 at 4:19 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > On Tue, 18 Feb 2025 at 12:44, Prabhakar <prabhakar.csengg@...il.com> wrote:
> > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > >
> > > Move the `PLL_CLK_ACCESS()`, `PLL_CLK1_OFFSET()`, and `PLL_CLK2_OFFSET()`
> > > macros from `rzv2h-cpg.h` to `rzv2h-cpg.c`, as they are not intended for
> > > use by SoC-specific CPG drivers.
> > >
> > > Additionally, update `PLL_CLK1_OFFSET()` and `PLL_CLK2_OFFSET()` to use
> > > the `FIELD_GET()` macro for better readability and simplify the
> > > `PLL_CLK_ACCESS()` macro.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Thanks for your patch!
> >
> > The changes look correct to me, so
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> > but I still have some comments...
> >
> > > --- a/drivers/clk/renesas/rzv2h-cpg.c
> > > +++ b/drivers/clk/renesas/rzv2h-cpg.c
> > > @@ -56,6 +56,10 @@
> > >
> > >  #define CPG_CLKSTATUS0         (0x700)
> > >
> > > +#define PLL_CLK_ACCESS(n)      (!!((n) & BIT(31)))
> >
> > OK
> >
> > > +#define PLL_CLK1_OFFSET(n)     FIELD_GET(GENMASK(15, 0), (n))
> > > +#define PLL_CLK2_OFFSET(n)     (PLL_CLK1_OFFSET(n) + (0x4))
> >
> > IMO, the original versions are more readable, as they clearly show
> > the symmetry between encoding and decoding.
> >
> > Perhaps a good alternative would be a structure with bitfields and
> > a PACK() macro, like is used for DDIV and SMUX?
> >
> Sure, I'll do that. Is it OK if I make that change on top of this
> series or do you want me to rework and send a v2?

I think there will be a v2 ;-)

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds