linux-kernel - [PATCH RESEND 1/2] pinctrl: core: take into account the pins array in pinctrl_pins

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Date: Fri, 10 May 2024 18:25:38 +0200
From: Léo DUBOIN <lduboin@...ebox.fr>
To: linus.walleij@...aro.org
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Léo DUBOIN <lduboin@...ebox.fr>
Subject: [PATCH RESEND 1/2] pinctrl: core: take into account the pins array in pinctrl_pins_show()

We previously only looked at the 'pin_base' of the pinctrl_gpio_ranges
struct for determining if a pin matched a GPIO number.

This value is present only if the 'pins' array is not NULL,
and is 0 otherwise. This means that GPIO ranges declared using
gpiochip_add_pingroup_range(), thus making use of pins, were always matched
by the pins in the range [0-npins] even if they contained pins in a
completely separate range.

Signed-off-by: Léo DUBOIN <lduboin@...ebox.fr>
---
 drivers/pinctrl/core.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 6649357637ff..901f2f9bf850 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -1672,11 +1672,20 @@ static int pinctrl_pins_show(struct seq_file *s, void *what)
 #ifdef CONFIG_GPIOLIB
 		gpio_num = -1;
 		list_for_each_entry(range, &pctldev->gpio_ranges, node) {
-			if ((pin >= range->pin_base) &&
-			    (pin < (range->pin_base + range->npins))) {
-				gpio_num = range->base + (pin - range->pin_base);
-				break;
+			if (range->pins != NULL) {
+				for (int i = 0; i < range->npins; ++i) {
+					if (range->pins[i] == pin) {
+						gpio_num = range->base + i;
+						break;
+					}
+				}
+			} else if ((pin >= range->pin_base) &&
+				   (pin < (range->pin_base + range->npins))) {
+				gpio_num =
+					range->base + (pin - range->pin_base);
 			}
+			if (gpio_num != -1)
+				break;
 		}
 		if (gpio_num >= 0)
 			/*
-- 
2.42.0