linux-kernel - Re: [RFC PATCH 06/13] pinctrl: renesas: pinctrl-rzg2l: Make cfg to u64 in struct rzg2l_variable_pin

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Message-ID: <CA+V-a8udXMwzZvJhDH5kK9J4ihLU00TbpKNb5-YoxOGFtdgpPg@mail.gmail.com>
Date: Thu, 28 Mar 2024 19:53:12 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Magnus Damm <magnus.damm@...il.com>, linux-renesas-soc@...r.kernel.org, 
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [RFC PATCH 06/13] pinctrl: renesas: pinctrl-rzg2l: Make cfg to
 u64 in struct rzg2l_variable_pin_cfg

Hi Geert,

Thank you for the review.

On Thu, Mar 28, 2024 at 2:14 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Tue, Mar 26, 2024 at 11:30 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Now that we have updated the macro PIN_CFG_MASK to allow for the maximum
> > configuration bits, update the size of 'cfg' to 'u64' in the
> > 'struct rzg2l_variable_pin_cfg'.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Thanks for your patch!
>
> > --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > @@ -241,7 +241,7 @@ struct rzg2l_dedicated_configs {
> >   * @pin: port pin
> >   */
> >  struct rzg2l_variable_pin_cfg {
> > -       u32 cfg:20;
> > +       u64 cfg:46;
> >         u32 port:5;
> >         u32 pin:3;
>
> Doesn't this store the 46 cfg bits in a 64-bit word, and the 8 port
> and pin bits in a different 32-bit word?  Worse, you'll get 4 bytes
> of padding at the end of the structure.
Agreed.

> Changing the port and pin to u64 should make sure everything is
> stored together in a single 64-bit word.
>
I'll change the port and pin to u64 .

Cheers,
Prabhakar