linux-kernel - Re: [PATCH] pinctrl: renesas: rzg2l: Add suspend/resume support for pull up/down

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Message-ID: <CA+V-a8sd6B+_dSqrQJTggO2mr4GRQ8sqg3ES205mhgp0yz-fLA@mail.gmail.com>
Date: Wed, 5 Feb 2025 11:27:59 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: geert+renesas@...der.be, linus.walleij@...aro.org, 
	linux-renesas-soc@...r.kernel.org, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH] pinctrl: renesas: rzg2l: Add suspend/resume support for
 pull up/down

On Wed, Feb 5, 2025 at 10:13 AM Claudiu <claudiu.beznea@...on.dev> wrote:
>
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> The Renesas RZ/G3S supports a power-saving mode where power to most of the
> SoC components is lost, including the PIN controller. Save and restore the
> pull-up/pull-down register contents to ensure the functionality is
> preserved after a suspend/resume cycle.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
>  drivers/pinctrl/renesas/pinctrl-rzg2l.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Cheers,
Prabhakar

> diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> index 4fae24453c11..7eb91ac5ba42 100644
> --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> @@ -318,6 +318,7 @@ struct rzg2l_pinctrl_pin_settings {
>   * @pmc: PMC registers cache
>   * @pfc: PFC registers cache
>   * @iolh: IOLH registers cache
> + * @pupd: PUPD registers cache
>   * @ien: IEN registers cache
>   * @sd_ch: SD_CH registers cache
>   * @eth_poc: ET_POC registers cache
> @@ -331,6 +332,7 @@ struct rzg2l_pinctrl_reg_cache {
>         u32     *pfc;
>         u32     *iolh[2];
>         u32     *ien[2];
> +       u32     *pupd[2];
>         u8      sd_ch[2];
>         u8      eth_poc[2];
>         u8      eth_mode;
> @@ -2712,6 +2714,11 @@ static int rzg2l_pinctrl_reg_cache_alloc(struct rzg2l_pinctrl *pctrl)
>                 if (!cache->ien[i])
>                         return -ENOMEM;
>
> +               cache->pupd[i] = devm_kcalloc(pctrl->dev, nports, sizeof(*cache->pupd[i]),
> +                                             GFP_KERNEL);
> +               if (!cache->pupd[i])
> +                       return -ENOMEM;
> +
>                 /* Allocate dedicated cache. */
>                 dedicated_cache->iolh[i] = devm_kcalloc(pctrl->dev, n_dedicated_pins,
>                                                         sizeof(*dedicated_cache->iolh[i]),
> @@ -2953,7 +2960,7 @@ static void rzg2l_pinctrl_pm_setup_regs(struct rzg2l_pinctrl *pctrl, bool suspen
>         struct rzg2l_pinctrl_reg_cache *cache = pctrl->cache;
>
>         for (u32 port = 0; port < nports; port++) {
> -               bool has_iolh, has_ien;
> +               bool has_iolh, has_ien, has_pupd;
>                 u32 off, caps;
>                 u8 pincnt;
>                 u64 cfg;
> @@ -2965,6 +2972,7 @@ static void rzg2l_pinctrl_pm_setup_regs(struct rzg2l_pinctrl *pctrl, bool suspen
>                 caps = FIELD_GET(PIN_CFG_MASK, cfg);
>                 has_iolh = !!(caps & (PIN_CFG_IOLH_A | PIN_CFG_IOLH_B | PIN_CFG_IOLH_C));
>                 has_ien = !!(caps & PIN_CFG_IEN);
> +               has_pupd = !!(caps & PIN_CFG_PUPD);
>
>                 if (suspend)
>                         RZG2L_PCTRL_REG_ACCESS32(suspend, pctrl->base + PFC(off), cache->pfc[port]);
> @@ -2983,6 +2991,15 @@ static void rzg2l_pinctrl_pm_setup_regs(struct rzg2l_pinctrl *pctrl, bool suspen
>                         }
>                 }
>
> +               if (has_pupd) {
> +                       RZG2L_PCTRL_REG_ACCESS32(suspend, pctrl->base + PUPD(off),
> +                                                cache->pupd[0][port]);
> +                       if (pincnt >= 4) {
> +                               RZG2L_PCTRL_REG_ACCESS32(suspend, pctrl->base + PUPD(off),
> +                                                        cache->pupd[1][port]);
> +                       }
> +               }
> +
>                 RZG2L_PCTRL_REG_ACCESS16(suspend, pctrl->base + PM(off), cache->pm[port]);
>                 RZG2L_PCTRL_REG_ACCESS8(suspend, pctrl->base + P(off), cache->p[port]);
>
> --
> 2.43.0
>
>