linux-kernel - [PATCH v2 3/4] gpio: gpio-rcar: Drop direct use of valid

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Message-ID: <fae20f205d4d3c9f0bafb133e51dd115f68de84d.1740745270.git.mazziesaccount@gmail.com>
Date: Fri, 28 Feb 2025 14:36:01 +0200
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <mazziesaccount@...il.com>,
	Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH v2 3/4] gpio: gpio-rcar: Drop direct use of valid_mask

The valid_mask member of the struct gpio_chip is unconditionally written
by the GPIO core at driver registration. It should not be directly
populated by the drivers. Hiding the valid_mask in struct gpio_device
makes it clear it is not meant to be directly populated by drivers. This
means drivers should not access it directly from the struct gpio_chip.

The gpio-rcar checks the valid mask in set/get_multiple() operations.
This is no longer needed [1]. Drop these checks.

Additionally, the valid_mask is needed for enabling the GPIO inputs at
probe time. Use the new valid_mask -getter function instead of accessing
it directly from the struct gpio_chip.

Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
---
Please note that this change is compile-tested only. All reviewing and
testing is highly appreciated.

Revision history:
v1 => v2:
 - New patch

[1]: https://lore.kernel.org/all/TY3PR01MB11346EC54C8672C4D28F931F686CC2@TY3PR01MB11346.jpnprd01.prod.outlook.com/
---
 drivers/gpio/gpio-rcar.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 2ecee3269a0c..e32d731d0473 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -336,9 +336,6 @@ static int gpio_rcar_get_multiple(struct gpio_chip *chip, unsigned long *mask,
 	unsigned long flags;
 
 	bankmask = mask[0] & GENMASK(chip->ngpio - 1, 0);
-	if (chip->valid_mask)
-		bankmask &= chip->valid_mask[0];
-
 	if (!bankmask)
 		return 0;
 
@@ -380,9 +377,6 @@ static void gpio_rcar_set_multiple(struct gpio_chip *chip, unsigned long *mask,
 	u32 val, bankmask;
 
 	bankmask = mask[0] & GENMASK(chip->ngpio - 1, 0);
-	if (chip->valid_mask)
-		bankmask &= chip->valid_mask[0];
-
 	if (!bankmask)
 		return;
 
@@ -482,10 +476,13 @@ static int gpio_rcar_parse_dt(struct gpio_rcar_priv *p, unsigned int *npins)
 static void gpio_rcar_enable_inputs(struct gpio_rcar_priv *p)
 {
 	u32 mask = GENMASK(p->gpio_chip.ngpio - 1, 0);
+	const unsigned long *valid_mask;
+
+	valid_mask = gpiochip_query_valid_mask(&p->gpio_chip);
 
 	/* Select "Input Enable" in INEN */
-	if (p->gpio_chip.valid_mask)
-		mask &= p->gpio_chip.valid_mask[0];
+	if (valid_mask)
+		mask &= valid_mask[0];
 	if (mask)
 		gpio_rcar_write(p, INEN, gpio_rcar_read(p, INEN) | mask);
 }
-- 
2.48.1


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