[PATCH] gpio: rockchip: Fix GPIO after convert to dynamic base allocation

[Jonas Karlman <jonas@kwiboo.se>]

The commit c8079f83e0bf ("gpio: rockchip: convert to dynamic GPIO base
allocation") broke GPIO on devices using device trees which don't set
the gpio-ranges property, something only Rockchip RK35xx SoC DTs do.

On a Rockchip RK3399 device something like following is now observed:

[    0.082771] rockchip-gpio ff720000.gpio: probed /pinctrl/gpio@ff720000
[    0.083531] rockchip-gpio ff730000.gpio: probed /pinctrl/gpio@ff730000
[    0.084110] rockchip-gpio ff780000.gpio: probed /pinctrl/gpio@ff780000
[    0.084746] rockchip-gpio ff788000.gpio: probed /pinctrl/gpio@ff788000
[    0.085389] rockchip-gpio ff790000.gpio: probed /pinctrl/gpio@ff790000
--
[    0.212208] rockchip-pinctrl pinctrl: pin 637 is not registered so it cannot be requested
[    0.212271] rockchip-pinctrl pinctrl: error -EINVAL: pin-637 (gpio3:637)
[    0.212344] leds-gpio leds: error -EINVAL: Failed to get GPIO '/leds/led-0'
[    0.212389] leds-gpio leds: probe with driver leds-gpio failed with error -22
--
[    0.607545] rockchip-pinctrl pinctrl: pin 519 is not registered so it cannot be requested
[    0.608775] rockchip-pinctrl pinctrl: error -EINVAL: pin-519 (gpio0:519)
[    0.610003] dwmmc_rockchip fe320000.mmc: probe with driver dwmmc_rockchip failed with error -22
--
[    0.805882] rockchip-pinctrl pinctrl: pin 547 is not registered so it cannot be requested
[    0.806672] rockchip-pinctrl pinctrl: error -EINVAL: pin-547 (gpio1:547)
[    0.807301] reg-fixed-voltage regulator-vbus-typec: error -EINVAL: can't get GPIO
[    0.807307] rockchip-pinctrl pinctrl: pin 602 is not registered so it cannot be requested
[    0.807970] reg-fixed-voltage regulator-vbus-typec: probe with driver reg-fixed-voltage failed with error -22
[    0.808692] rockchip-pinctrl pinctrl: error -EINVAL: pin-602 (gpio2:602)
[    0.810279] reg-fixed-voltage regulator-vcc3v3-pcie: error -EINVAL: can't get GPIO
[    0.810284] rockchip-pinctrl pinctrl: pin 665 is not registered so it cannot be requested
[    0.810299] rockchip-pinctrl pinctrl: error -EINVAL: pin-665 (gpio4:665)
[    0.810960] reg-fixed-voltage regulator-vcc3v3-pcie: probe with driver reg-fixed-voltage failed with error -22
[    0.811679] reg-fixed-voltage regulator-vcc5v0-host: error -EINVAL: can't get GPIO
[    0.813943] reg-fixed-voltage regulator-vcc5v0-host: probe with driver reg-fixed-voltage failed with error -22
--
[    0.867788] rockchip-pinctrl pinctrl: pin 522 is not registered so it cannot be requested
[    0.868537] rockchip-pinctrl pinctrl: error -EINVAL: pin-522 (gpio0:522)
[    0.869166] pwrseq_simple sdio-pwrseq: error -EINVAL: reset GPIOs not ready
[    0.869798] pwrseq_simple sdio-pwrseq: probe with driver pwrseq_simple failed with error -22
--
[    0.940365] rockchip-pinctrl pinctrl: pin 623 is not registered so it cannot be requested
[    0.941084] rockchip-pinctrl pinctrl: error -EINVAL: pin-623 (gpio3:623)
[    0.941823] rk_gmac-dwmac fe300000.ethernet: error -EINVAL: Cannot register the MDIO bus
[    0.942542] rk_gmac-dwmac fe300000.ethernet: error -EINVAL: MDIO bus (id: 0) registration failed
[    0.943772] rk_gmac-dwmac fe300000.ethernet: probe with driver rk_gmac-dwmac failed with error -22

Restore GPIO to a working state on devices using older Rockchip SoCs
and/or DTs not having the gpio-ranges property set by restoring prior
use of bank->pin_base as the pin_offset value.

Also change to use bank->nr_pins as the npins value to align and prevent
a possible future breakage if gc->ngpio is ever changed to match the 32
GPIOs each controller theoretically can handle.

Fixes: c8079f83e0bf ("gpio: rockchip: convert to dynamic GPIO base allocation")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 drivers/gpio/gpio-rockchip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 08ea64434f8f..44d7ebd12724 100644
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -617,7 +617,7 @@ static int rockchip_gpiolib_register(struct rockchip_pin_bank *bank)
 			return -ENODEV;
 
 		ret = gpiochip_add_pin_range(gc, dev_name(pctldev->dev), 0,
-					     gc->base, gc->ngpio);
+					     bank->pin_base, bank->nr_pins);
 		if (ret) {
 			dev_err(bank->dev, "Failed to add pin range\n");
 			goto fail;
-- 
2.53.0