From 1763933d377ecb05454f8d20e3c8922480db2ac0 Mon Sep 17 00:00:00 2001
From: Chen-Yu Tsai <wenst@chromium.org>
Date: Tue, 8 Mar 2022 18:09:51 +0800
Subject: [PATCH] pinctrl: mediatek: paris: Skip custom extra pin config dump for virtual GPIOs
Git-commit: 1763933d377ecb05454f8d20e3c8922480db2ac0
Patch-mainline: v5.18-rc1
References: git-fixes

Virtual GPIOs do not have any hardware state associated with them. Any
attempt to read back hardware state for these pins result in error
codes.

Skip dumping extra pin config information for these virtual GPIOs.

Fixes: 184d8e13f9b1 ("pinctrl: mediatek: Add support for pin configuration dump via debugfs.")
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220308100956.2750295-7-wenst@chromium.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/pinctrl/mediatek/pinctrl-paris.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
index d4fde741e354..c8e74945401d 100644
--- a/drivers/pinctrl/mediatek/pinctrl-paris.c
+++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
@@ -581,6 +581,9 @@ ssize_t mtk_pctrl_show_one_pin(struct mtk_pinctrl *hw,
 	if (gpio >= hw->soc->npins)
 		return -EINVAL;
 
+	if (mtk_is_virt_gpio(hw, gpio))
+		return -EINVAL;
+
 	desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
 	pinmux = mtk_pctrl_get_pinmux(hw, gpio);
 	if (pinmux >= hw->soc->nfuncs)
-- 
2.31.1