powerpc/8xx: implement get_direction() in cpm1

The lack of get_direction() callbacks in this driver causes GPIOLIB to
emit a warning. Implement them for 16- and 32-bit variants.

Reported-by: Christophe Leroy <chleroy@kernel.org>
Closes: https://lore.kernel.org/all/63487206f6e5a93eaf9f41784317fe99d394312f.1780399750.git.chleroy@kernel.org/
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Fixes: e623c4303ed1 ("gpiolib: sanitize the return value of gpio_chip::get_direction()")
Tested-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
[Maddy: Fixed the Fixes tag]
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260603-powerpc-8xx-cpm1-get-dir-v1-1-2ae1c9a5b992@oss.qualcomm.com

diff --git a/arch/powerpc/platforms/8xx/cpm1.c b/arch/powerpc/platforms/8xx/cpm1.c
index f00734f0590cf7c7382f808dce27373d9ff3d8bc..b31376bf6778802a7f6b6b499066846b6b1f61e9 100644 (file)
--- a/arch/powerpc/platforms/8xx/cpm1.c
+++ b/arch/powerpc/platforms/8xx/cpm1.c
@@ -472,6 +472,18 @@ static int cpm1_gpio16_dir_in(struct gpio_chip *gc, unsigned int gpio)
        return 0;
 }
 
+static int cpm1_gpio16_get_direction(struct gpio_chip *gc, unsigned int gpio)
+{
+       struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
+       struct cpm_ioport16 __iomem *iop = cpm1_gc->regs;
+       u16 pin_mask = 1 << (15 - gpio);
+
+       if (in_be16(&iop->dir) & pin_mask)
+               return GPIO_LINE_DIRECTION_OUT;
+
+       return GPIO_LINE_DIRECTION_IN;
+}
+
 int cpm1_gpiochip_add16(struct device *dev)
 {
        struct device_node *np = dev->of_node;
@@ -498,6 +510,7 @@ int cpm1_gpiochip_add16(struct device *dev)
        gc->ngpio = 16;
        gc->direction_input = cpm1_gpio16_dir_in;
        gc->direction_output = cpm1_gpio16_dir_out;
+       gc->get_direction = cpm1_gpio16_get_direction;
        gc->get = cpm1_gpio16_get;
        gc->set = cpm1_gpio16_set;
        gc->to_irq = cpm1_gpio16_to_irq;
@@ -604,6 +617,18 @@ static int cpm1_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
        return 0;
 }
 
+static int cpm1_gpio32_get_direction(struct gpio_chip *gc, unsigned int gpio)
+{
+       struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(gc);
+       struct cpm_ioport32b __iomem *iop = cpm1_gc->regs;
+       u32 pin_mask = 1 << (31 - gpio);
+
+       if (in_be32(&iop->dir) & pin_mask)
+               return GPIO_LINE_DIRECTION_OUT;
+
+       return GPIO_LINE_DIRECTION_IN;
+}
+
 int cpm1_gpiochip_add32(struct device *dev)
 {
        struct device_node *np = dev->of_node;
@@ -621,6 +646,7 @@ int cpm1_gpiochip_add32(struct device *dev)
        gc->ngpio = 32;
        gc->direction_input = cpm1_gpio32_dir_in;
        gc->direction_output = cpm1_gpio32_dir_out;
+       gc->get_direction = cpm1_gpio32_get_direction;
        gc->get = cpm1_gpio32_get;
        gc->set = cpm1_gpio32_set;
        gc->parent = dev;