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

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Date: Wed, 22 May 2024 14:39:30 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.com>
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 Prabhakar,

On Tue, Apr 23, 2024 at 7:59 PM Prabhakar <prabhakar.csengg@...il.com> 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.

> +{
> +       writeb(val, addr);
> +}

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

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