[linux-yocto] [PATCH 19/35] gpio: pl061: specify gpio base via device tree

[Daniel Dragomir]

From: Anders Berg <anders.berg at avagotech.com>

Use DT alias to allow the gpio base to be selected. This solves compatibility
with user-space programs that expects a fixed numbering scheme from non-DT
system. If an alias for the device node is not defined in device tree, the
fallback is to use the dynamically allocated number.

Signed-off-by: Anders Berg <anders.berg at avagotech.com>
---
 drivers/gpio/gpio-pl061.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
index c13f8d1..d1c3b15 100644
--- a/drivers/gpio/gpio-pl061.c
+++ b/drivers/gpio/gpio-pl061.c
@@ -298,7 +298,11 @@ static int pl061_probe(struct device *dev,
 		if (irq_base <= 0)
 			return -ENODEV;
 	} else if (dev->of_node) {
-		chip->gc.base = -1;
+		int id = of_alias_get_id(dev->of_node, "gpio");
+		if (id < 0)
+			chip->gc.base = -1;
+		else
+			chip->gc.base = id * PL061_GPIO_NR;
 		irq_base = 0;
 	} else {
 		if (retchip)
-- 
1.8.1.4