linux-kernel - Re: [RFC PATCH 07/13] pinctrl: renesas: pinctrl-rzg2l: Validate power registers for SD and ETH

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Date: Thu, 28 Mar 2024 19:40:31 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: claudiu beznea <claudiu.beznea@...on.dev>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>, 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 07/13] pinctrl: renesas: pinctrl-rzg2l: Validate power
 registers for SD and ETH

Hi Claudiu,

Thank you for the review.

On Thu, Mar 28, 2024 at 8:01 AM claudiu beznea <claudiu.beznea@...on.dev> wrote:
>
> Hi, Prabhakar,
>
> On 27.03.2024 00:28, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > On RZ/V2H(P) SoC, the power registers for SD and ETH do not exist,
> > resulting in invalid register offsets. Ensure that the register offsets
> > are valid before any read/write operations are performed. If the power
> > registers are not available, both SD and ETH will be set to -EINVAL.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> >  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 16 ++++++++++------
> >  1 file changed, 10 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > index 348fdccaff72..705372faaeff 100644
> > --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > @@ -184,8 +184,8 @@
> >   */
> >  struct rzg2l_register_offsets {
> >       u16 pwpr;
> > -     u16 sd_ch;
> > -     u16 eth_poc;
> > +     int sd_ch;
> > +     int eth_poc;
> >  };
> >
> >  /**
> > @@ -2567,8 +2567,10 @@ static int rzg2l_pinctrl_suspend_noirq(struct device *dev)
> >       rzg2l_pinctrl_pm_setup_dedicated_regs(pctrl, true);
> >
> >       for (u8 i = 0; i < 2; i++) {
> > -             cache->sd_ch[i] = readb(pctrl->base + SD_CH(regs->sd_ch, i));
> > -             cache->eth_poc[i] = readb(pctrl->base + ETH_POC(regs->eth_poc, i));
> > +             if (regs->sd_ch != -EINVAL)
>
> As of my knowledge, the current users of this driver uses SD and ETH
> offsets different from zero. To avoid populating these values for all the
> SoCs and avoid increasing the size of these fields I think you can add
> checks like these:
>
> if (regs->sd_ch)
>         // set sd_ch
>
Agreed.

>
> Same for the rest.
>
OK.

Cheers,
Prabhakar