Thread (12 messages) 12 messages, 4 authors, 2025-06-11

Re: [PATCH 3/4] net: can: mcp251x: use new GPIO line value setter callbacks

From: Vincent Mailhol <hidden>
Date: 2025-06-10 14:04:48
Also in: linux-arm-kernel, linux-arm-msm, linux-can, linux-gpio, linux-mediatek, lkml

On 10/06/2025 at 21:37, Bartosz Golaszewski wrote:
From: Bartosz Golaszewski <redacted>

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Signed-off-by: Bartosz Golaszewski <redacted>
                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This does not match the address with which you sent the patch: brgl@bgdev.pl
quoted hunk ↗ jump to hunk
---
 drivers/net/can/spi/mcp251x.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
index ec5c64006a16f703bc816983765584c5f3ac76e8..7545497d14b46c6388f3976c2bf7b9a99e959c1e 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -530,8 +530,8 @@ static int mcp251x_gpio_get_multiple(struct gpio_chip *chip,
 	return 0;
 }
 
-static void mcp251x_gpio_set(struct gpio_chip *chip, unsigned int offset,
-			     int value)
+static int mcp251x_gpio_set(struct gpio_chip *chip, unsigned int offset,
+			    int value)
 {
 	struct mcp251x_priv *priv = gpiochip_get_data(chip);
 	u8 mask, val;
@@ -545,9 +545,11 @@ static void mcp251x_gpio_set(struct gpio_chip *chip, unsigned int offset,
 
 	priv->reg_bfpctrl &= ~mask;
 	priv->reg_bfpctrl |= val;
+
+	return 0;
mcp251x_gpio_set() calls mcp251x_write_bits() which calls mcp251x_spi_write()
which can fail.

For this change to really make sense, the return value of mcp251x_spi_write()
should be propagated all the way around.
quoted hunk ↗ jump to hunk
 }
 
-static void
+static int
 mcp251x_gpio_set_multiple(struct gpio_chip *chip,
 			  unsigned long *maskp, unsigned long *bitsp)
 {
@@ -561,7 +563,7 @@ mcp251x_gpio_set_multiple(struct gpio_chip *chip,
 	val = FIELD_PREP(BFPCTRL_BFS_MASK, val);
 
 	if (!mask)
-		return;
+		return 0;
 
 	mutex_lock(&priv->mcp_lock);
 	mcp251x_write_bits(priv->spi, BFPCTRL, mask, val);
@@ -569,6 +571,8 @@ mcp251x_gpio_set_multiple(struct gpio_chip *chip,
 
 	priv->reg_bfpctrl &= ~mask;
 	priv->reg_bfpctrl |= val;
+
+	return 0;
Same as above.
quoted hunk ↗ jump to hunk
 }
 
 static void mcp251x_gpio_restore(struct spi_device *spi)
@@ -594,8 +598,8 @@ static int mcp251x_gpio_setup(struct mcp251x_priv *priv)
 	gpio->get_direction = mcp251x_gpio_get_direction;
 	gpio->get = mcp251x_gpio_get;
 	gpio->get_multiple = mcp251x_gpio_get_multiple;
-	gpio->set = mcp251x_gpio_set;
-	gpio->set_multiple = mcp251x_gpio_set_multiple;
+	gpio->set_rv = mcp251x_gpio_set;
+	gpio->set_multiple_rv = mcp251x_gpio_set_multiple;
 	gpio->base = -1;
 	gpio->ngpio = ARRAY_SIZE(mcp251x_gpio_names);
 	gpio->names = mcp251x_gpio_names;
Yours sincerely,
Vincent Mailhol
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