From 837afa592c6234be82acb5d23e0a39e9befdaa85 Mon Sep 17 00:00:00 2001 From: Biju Das Date: Tue, 19 Aug 2025 09:40:20 +0100 Subject: [PATCH] pinctrl: renesas: rzg2l: Add suspend/resume support for Schmitt control registers Renesas RZ/G3E supports a power-saving mode where power to most of the SoC components is lost, including the PIN controller. Save and restore the Schmitt control register contents to ensure the functionality is preserved after a suspend/resume cycle. Signed-off-by: Biju Das Reviewed-by: Claudiu Beznea Tested-by: Claudiu Beznea # on RZ/G3S Reviewed-by: Geert Uytterhoeven Link: https://lore.kernel.org/20250819084022.20512-1-biju.das.jz@bp.renesas.com Signed-off-by: Geert Uytterhoeven --- drivers/pinctrl/renesas/pinctrl-rzg2l.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c index f72814dab38ce..7b8219f200639 100644 --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c @@ -321,6 +321,7 @@ struct rzg2l_pinctrl_pin_settings { * @iolh: IOLH registers cache * @pupd: PUPD registers cache * @ien: IEN registers cache + * @smt: SMT registers cache * @sd_ch: SD_CH registers cache * @eth_poc: ET_POC registers cache * @oen: Output Enable register cache @@ -334,6 +335,7 @@ struct rzg2l_pinctrl_reg_cache { u32 *iolh[2]; u32 *ien[2]; u32 *pupd[2]; + u32 *smt; u8 sd_ch[2]; u8 eth_poc[2]; u8 oen; @@ -2704,6 +2706,10 @@ static int rzg2l_pinctrl_reg_cache_alloc(struct rzg2l_pinctrl *pctrl) if (!cache->pfc) return -ENOMEM; + cache->smt = devm_kcalloc(pctrl->dev, nports, sizeof(*cache->smt), GFP_KERNEL); + if (!cache->smt) + return -ENOMEM; + for (u8 i = 0; i < 2; i++) { u32 n_dedicated_pins = pctrl->data->n_dedicated_pins; @@ -2965,7 +2971,7 @@ 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, has_pupd; + bool has_iolh, has_ien, has_pupd, has_smt; u32 off, caps; u8 pincnt; u64 cfg; @@ -2978,6 +2984,7 @@ static void rzg2l_pinctrl_pm_setup_regs(struct rzg2l_pinctrl *pctrl, bool suspen 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); + has_smt = !!(caps & PIN_CFG_SMT); if (suspend) RZG2L_PCTRL_REG_ACCESS32(suspend, pctrl->base + PFC(off), cache->pfc[port]); @@ -3016,6 +3023,9 @@ static void rzg2l_pinctrl_pm_setup_regs(struct rzg2l_pinctrl *pctrl, bool suspen cache->ien[1][port]); } } + + if (has_smt) + RZG2L_PCTRL_REG_ACCESS32(suspend, pctrl->base + SMT(off), cache->smt[port]); } } -- 2.47.3