[PATCH] powerpc: implement get_direction() in cpm2

[Christophe Leroy (CS GROUP)]

The lack of get_direction() callback in this driver causes GPIOLIB to
emit a warning. Implement it.

Fixes: e623c4303ed1 ("gpiolib: sanitize the return value of gpio_chip::get_direction()")
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@xxxxxxxxxx>
---
 arch/powerpc/sysdev/cpm_common.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c
index 07ea605ab0e6..b5d200e3ad68 100644
--- a/arch/powerpc/sysdev/cpm_common.c
+++ b/arch/powerpc/sysdev/cpm_common.c
@@ -181,6 +181,18 @@ static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
 	return 0;
 }
 
+static int cpm2_gpio32_get_direction(struct gpio_chip *gc, unsigned int gpio)
+{
+	struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(gc);
+	struct cpm2_ioports __iomem *iop = cpm2_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 cpm2_gpiochip_add32(struct device *dev)
 {
 	struct device_node *np = dev->of_node;
@@ -199,6 +211,7 @@ int cpm2_gpiochip_add32(struct device *dev)
 	gc->ngpio = 32;
 	gc->direction_input = cpm2_gpio32_dir_in;
 	gc->direction_output = cpm2_gpio32_dir_out;
+	gc->get_direction = cpm2_gpio32_get_direction;
 	gc->get = cpm2_gpio32_get;
 	gc->set = cpm2_gpio32_set;
 	gc->parent = dev;
-- 
2.54.0