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pinctrl: renesas: rzt2h: Skip PFC mode configuration if already set

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In rzt2h_pinctrl_set_pfc_mode(), read the PMC and PFC registers upfront
and skip the pin function configuration if the pin is already in
peripheral mode with the desired function.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260513115312.1574367-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
This commit is contained in:
Lad Prabhakar 2026-05-13 12:53:12 +01:00 committed by Geert Uytterhoeven
parent ccf707ca74
commit f9fb67bc77
1 changed files with 6 additions and 1 deletions
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7
drivers/pinctrl/renesas/pinctrl-rzt2h.c
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@ -191,6 +191,12 @@ static void rzt2h_pinctrl_set_pfc_mode(struct rzt2h_pinctrl *pctrl,
guard(raw_spinlock_irqsave)(&pctrl->lock);
reg64 = rzt2h_pinctrl_readq(pctrl, port, PFC(port));
/* Check if pin is already configured to the desired function */
if ((rzt2h_pinctrl_readb(pctrl, port, PMC(port)) & BIT(pin)) &&
field_get(PFC_PIN_MASK(pin), reg64) == func)
return;
/* Set pin to 'Non-use (Hi-Z input protection)' */
reg16 = rzt2h_pinctrl_readw(pctrl, port, PM(port));
reg16 &= ~PM_PIN_MASK(pin);
@ -200,7 +206,6 @@ static void rzt2h_pinctrl_set_pfc_mode(struct rzt2h_pinctrl *pctrl,
rzt2h_pinctrl_set_gpio_en(pctrl, port, pin, true);
/* Select Pin function mode with PFC register */
reg64 = rzt2h_pinctrl_readq(pctrl, port, PFC(port));
reg64 &= ~PFC_PIN_MASK(pin);
rzt2h_pinctrl_writeq(pctrl, port, reg64 | ((u64)func << (pin * 8)), PFC(port));