Re: [PATCH/RFC] pinctrl: sh-pfc: r8a77990: Fix MOD_SEL bit numbering

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

On Wed, Dec 26, 2018 at 7:46 AM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
> > From: Geert Uytterhoeven, Sent: Thursday, December 20, 2018 11:03 PM
> >
> > From: Takeshi Kihara <takeshi.kihara.df@xxxxxxxxxxx>
> >
> > MOD_SEL register bit numbering was different from R-Car E3 SoC and
> > R-Car H3/M3-[WN] SoCs.
> >
> > MOD_SEL 1-bit      H3/M3-[WN]  E3
> > ===============    ==========  =====
> > Set Value = H'0    b'0         b'0
> > Set Value = H'1    b'1         b'1
> >
> > MOD_SEL 2-bits     H3/M3-[WN]  E3
> > ===============    ==========  =====
> > Set Value = H'0    b'00        b'00
> > Set Value = H'1    b'01        b'10
> > Set Value = H'2    b'10        b'01
> > Set Value = H'3    b'11        b'11
> >
> > MOD_SEL 3-bits     H3/M3-[WN]  E3
> > ===============    ==========  =====
> > Set Value = H'0    b'000       b'000
> > Set Value = H'1    b'001       b'100
> > Set Value = H'2    b'010       b'010
> > Set Value = H'3    b'011       b'110
> > Set Value = H'4    b'100       b'001
> > Set Value = H'5    b'101       b'101
> > Set Value = H'6    b'110       b'011
> > Set Value = H'7    b'111       b'111
> >
> > This patch replaces the #define name and value of MOD_SEL.
> >
> > Signed-off-by: Takeshi Kihara <takeshi.kihara.df@xxxxxxxxxxx>
> > Fixes: 6d4036a1e3b3 ("pinctrl: sh-pfc: Initial R8A77990 PFC support")
> > [shimoda: Split a patch per SoC and revise the commit log]
> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> > [geert: Use macros to do the actual reordering]
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> > ---
> > Using a macro makes the code easier to writ, read, and maintain.
> > Use "git show --color-words" to see the difference.
> >
> > I'd love to handle the reversal in the PINMUX_CFG_REG_VAR()
> > descriptions, but I can't use e.g. REV8(MOD_SEL0_19_18_17) there, as
> > MOD_SEL0_19_18_17 is a single parameter, not 8 parameters.
> >
> > Can this be improved?
>
> Thank you for updating the patch to use the macros!
> I think this patch can improve readability.
>
> So,
>
> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>

Thanks, queuing in sh-pfc-for-v5.1.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds