linux-kernel - Re: [PATCH v2 07/13] pinctrl: renesas: pinctrl-rzg2l: Add function pointer for writing to PMC register

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Date: Tue, 28 May 2024 20:33:48 +0100
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 <krzk+dt@...nel.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, 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 v2 07/13] pinctrl: renesas: pinctrl-rzg2l: Add function
 pointer for writing to PMC register

Hi Geert,

Thank you for the review.

On Wed, May 22, 2024 at 1:39 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Tue, Apr 23, 2024 at 7:59 PM Prabhakar <prabhakar.csengg@...ilcom> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > This patch introduces a function pointer, pmc_writeb(), in the
> > struct rzg2l_pinctrl_data to facilitate writing to the PMC register. On
> > the RZ/V2H(P) SoC, unlocking the PWPR.REGWE_A bit before writing to PMC
> > registers is required, whereas this is not the case for the existing
> > RZ/G2L family. This addition enables the reuse of existing code for
> > RZ/V2H(P). Additionally, this patch populates this function pointer with
> > appropriate data for existing SoCs.
> >
> > Note that this functionality is only handled in rzg2l_gpio_request(), as
> > PMC unlock/lock during PFC setup will be taken care of in the
> > pwpr_pfc_unlock/pwpr_pfc_lock.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > RFC->v2
> > - No change
>
> Thanks for the update!
>
> > --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > @@ -463,6 +464,11 @@ static const struct rzg2l_variable_pin_cfg r9a07g043f_variable_pin_cfg[] = {
> >  };
> >  #endif
> >
> > +static void rzg2l_pmc_writeb(struct rzg2l_pinctrl *pctrl, u8 val, void __iomem *addr)
>
> Please pass the register offset instead of the virtual register address.
> You do have pctrl->base here, and rzv2h_pmc_writeb() will need to use
> pctrl->base for all other register writes anyway.
>
Agreed,  I will pass the register offset (u16 offset) instead of
virtual address.

Cheers,
Prabhakar