[PATCH] rockchip: derive GPIO bank from alias if available

[John Keeping]

Upstream device trees now use standard node names like "gpio at ff..." but
the rk_gpio driver expects a name like "gpio0 at ff..." (note the index
before the @).

This is not a change that can be made in a -u-boot.dtsi file, so
updating to the latest upstream device trees requires updating the
driver.

Other GPIO drivers already use the sequence number to derive the bank.
This can be set explicitly using an alias in the device tree (which can
be added in a -u-boot.dtsi file) but Rockchip GPIO banks are defined in
order in the device tree anyway so when no aliases are supplied the
indexes should still be correct.

Note that the bank name is only used by the `gpio` command or
potentially by board code via dm_gpio_lookup_name() and related
functions; it is not used by driver code which will lookup GPIOs from
the device tree by phandle.  No Rockchip platforms make any use of
dm_gpio_lookup_name() or `gpio` in the boot scripts.

Cc: Quentin Schulz <quentin.schulz at theobroma-systems.com>
Cc: Johan Jonker <jbx6244 at gmail.com>
Signed-off-by: John Keeping <john at metanate.com>
---
 drivers/gpio/rk_gpio.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/rk_gpio.c b/drivers/gpio/rk_gpio.c
index 68f30157a9..8568f10cd0 100644
--- a/drivers/gpio/rk_gpio.c
+++ b/drivers/gpio/rk_gpio.c
@@ -142,7 +142,6 @@ static int rockchip_gpio_probe(struct udevice *dev)
 {
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 	struct rockchip_gpio_priv *priv = dev_get_priv(dev);
-	char *end;
 	int ret;
 
 	priv->regs = dev_read_addr_ptr(dev);
@@ -151,9 +150,8 @@ static int rockchip_gpio_probe(struct udevice *dev)
 		return ret;
 
 	uc_priv->gpio_count = ROCKCHIP_GPIOS_PER_BANK;
-	end = strrchr(dev->name, '@');
-	priv->bank = trailing_strtoln(dev->name, end);
-	priv->name[0] = 'A' + priv->bank;
+
+	priv->name[0] = 'A' + dev_seq(dev);
 	uc_priv->bank_name = priv->name;
 
 	return 0;
-- 
2.39.0