[PATCH] gpio: Pass mask and size with the init_valid_mask()

[Linus Walleij <linus.walleij@linaro.org>]

It is more helpful for drivers to have the affected fields
directly available when we use the callback to set up the
valid mask. Change this and switch over the only user
(MSM) to use the passed parameters. If we do this we can
also move the mask out of publicly visible struct fields.

Cc: Stephen Boyd <swboyd@chromium.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpio/gpiolib.c             |  8 +++++---
 drivers/pinctrl/qcom/pinctrl-msm.c | 19 ++++++++++---------
 include/linux/gpio/driver.h        |  4 +++-
 3 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 5277b8f1ff7c..22b87c6e8cd5 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -375,10 +375,12 @@ static int gpiochip_alloc_valid_mask(struct gpio_chip *gc)
 	return 0;
 }
 
-static int gpiochip_init_valid_mask(struct gpio_chip *gpiochip)
+static int gpiochip_init_valid_mask(struct gpio_chip *gc)
 {
-	if (gpiochip->init_valid_mask)
-		return gpiochip->init_valid_mask(gpiochip);
+	if (gc->init_valid_mask)
+		return gc->init_valid_mask(gc,
+					   gc->valid_mask,
+					   gc->ngpio);
 
 	return 0;
 }
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index 7f35c196bb3e..a5d8f75da4a7 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -593,24 +593,25 @@ static void msm_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 #define msm_gpio_dbg_show NULL
 #endif
 
-static int msm_gpio_init_valid_mask(struct gpio_chip *chip)
+static int msm_gpio_init_valid_mask(struct gpio_chip *gc,
+				    unsigned long *valid_mask,
+				    unsigned int ngpios)
 {
-	struct msm_pinctrl *pctrl = gpiochip_get_data(chip);
+	struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
 	int ret;
 	unsigned int len, i;
-	unsigned int max_gpios = pctrl->soc->ngpios;
 	const int *reserved = pctrl->soc->reserved_gpios;
 	u16 *tmp;
 
 	/* Driver provided reserved list overrides DT and ACPI */
 	if (reserved) {
-		bitmap_fill(chip->valid_mask, max_gpios);
+		bitmap_fill(valid_mask, ngpios);
 		for (i = 0; reserved[i] >= 0; i++) {
-			if (i >= max_gpios || reserved[i] >= max_gpios) {
+			if (i >= ngpios || reserved[i] >= ngpios) {
 				dev_err(pctrl->dev, "invalid list of reserved GPIOs\n");
 				return -EINVAL;
 			}
-			clear_bit(reserved[i], chip->valid_mask);
+			clear_bit(reserved[i], valid_mask);
 		}
 
 		return 0;
@@ -622,7 +623,7 @@ static int msm_gpio_init_valid_mask(struct gpio_chip *chip)
 	if (ret < 0)
 		return 0;
 
-	if (ret > max_gpios)
+	if (ret > ngpios)
 		return -EINVAL;
 
 	tmp = kmalloc_array(len, sizeof(*tmp), GFP_KERNEL);
@@ -635,9 +636,9 @@ static int msm_gpio_init_valid_mask(struct gpio_chip *chip)
 		goto out;
 	}
 
-	bitmap_zero(chip->valid_mask, max_gpios);
+	bitmap_zero(valid_mask, ngpios);
 	for (i = 0; i < len; i++)
-		set_bit(tmp[i], chip->valid_mask);
+		set_bit(tmp[i], valid_mask);
 
 out:
 	kfree(tmp);
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 72d48a2bab65..dc03323897ef 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -363,7 +363,9 @@ struct gpio_chip {
 	void			(*dbg_show)(struct seq_file *s,
 						struct gpio_chip *chip);
 
-	int			(*init_valid_mask)(struct gpio_chip *chip);
+	int			(*init_valid_mask)(struct gpio_chip *chip,
+						   unsigned long *valid_mask,
+						   unsigned int ngpios);
 
 	int			base;
 	u16			ngpio;
-- 
2.21.0