Re: [RFC PATCH 06/13] pinctrl: renesas: pinctrl-rzg2l: Make cfg to u64 in struct rzg2l_variable_pin_cfg

[Lad, Prabhakar]

Hi Geert,

Thank you for the review.

On Thu, Mar 28, 2024 at 2:14 PM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
>
> Hi Prabhakar,
>
> On Tue, Mar 26, 2024 at 11:30 PM Prabhakar <prabhakar.csengg@xxxxxxxxx> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> >
> > 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@xxxxxxxxxxxxxx>
>
> 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