ath9k: register GPIO chip for OF targets

This partitialy reverts commit ccab68f2d3.

Registering the GPIO chip without a parent device completely breaks the
ath9k GPIOs for device tree targets.

As long as boards using the devicetree don't have the gpio-controller
property set for the ath9k node, the unloading of the driver works as
expected.

Register the GPIO chip with the ath9k device as parent only for OF
targets to find a trade-off between the needs of driver developers and
the broken LEDs and buttons seen by users.

Signed-off-by: Mathias Kresin <dev@kresin.me>

package/kernel/mac80211/patches/ath/548-ath9k_enable_gpio_chip.patch

@@ -45,7 +45,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  #ifdef CPTCFG_ATH9K_DEBUGFS
 --- a/drivers/net/wireless/ath/ath9k/gpio.c
 +++ b/drivers/net/wireless/ath/ath9k/gpio.c
-@@ -16,13 +16,130 @@
+@@ -16,13 +16,139 @@
  
  #include "ath9k.h"
  #include <linux/ath9k_platform.h>
@@ -126,7 +126,13 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 +	gc->sc = sc;
 +	snprintf(gc->label, sizeof(gc->label), "ath9k-%s",
 +		 wiphy_name(sc->hw->wiphy));
-+
++#ifdef CONFIG_OF
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0)
++	gc->gchip.parent = sc->dev;
++#else
++	gc->gchip.dev = sc->dev;
++#endif
++#endif
 +	gc->gchip.label = gc->label;
 +	gc->gchip.base = -1;	/* determine base automatically */
 +	gc->gchip.ngpio = ah->caps.num_gpio_pins;
@@ -141,6 +147,9 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
 +		return;
 +	}
 +
++#ifdef CONFIG_OF
++	gc->gchip.owner = NULL;
++#endif
 +	sc->gpiochip = gc;
 +}
 +
@@ -178,7 +187,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  static void ath_fill_led_pin(struct ath_softc *sc)
  {
  	struct ath_hw *ah = sc->sc_ah;
-@@ -80,6 +197,12 @@ static int ath_add_led(struct ath_softc
+@@ -80,6 +206,12 @@ static int ath_add_led(struct ath_softc
  	else
  		ath9k_hw_set_gpio(sc->sc_ah, gpio->gpio, gpio->active_low);
  
@@ -191,7 +200,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	return 0;
  }
  
-@@ -136,17 +259,24 @@ void ath_deinit_leds(struct ath_softc *s
+@@ -136,17 +268,24 @@ void ath_deinit_leds(struct ath_softc *s
  
  	while (!list_empty(&sc->leds)) {
  		led = list_first_entry(&sc->leds, struct ath_led, list);
@@ -216,7 +225,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	char led_name[32];
  	const char *trigger;
  	int i;
-@@ -156,6 +286,15 @@ void ath_init_leds(struct ath_softc *sc)
+@@ -156,6 +295,15 @@ void ath_init_leds(struct ath_softc *sc)
  	if (AR_SREV_9100(sc->sc_ah))
  		return;
  
@@ -232,7 +241,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	ath_fill_led_pin(sc);
  
  	if (pdata && pdata->leds && pdata->num_leds)
-@@ -180,6 +319,7 @@ void ath_init_leds(struct ath_softc *sc)
+@@ -180,6 +328,7 @@ void ath_init_leds(struct ath_softc *sc)
  	ath_create_gpio_led(sc, sc->sc_ah->led_pin, led_name, trigger,
  			   !sc->sc_ah->config.led_active_high);
  }

package/kernel/mac80211/patches/ath/549-ath9k_enable_gpio_buttons.patch

@@ -29,7 +29,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  
  #ifdef CPTCFG_MAC80211_LEDS
  
-@@ -124,6 +126,67 @@ static void ath9k_unregister_gpio_chip(s
+@@ -133,6 +135,67 @@ static void ath9k_unregister_gpio_chip(s
  	sc->gpiochip = NULL;
  }
  
@@ -97,7 +97,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  #else /* CONFIG_GPIOLIB */
  
  static inline void ath9k_register_gpio_chip(struct ath_softc *sc)
-@@ -134,6 +197,14 @@ static inline void ath9k_unregister_gpio
+@@ -143,6 +206,14 @@ static inline void ath9k_unregister_gpio
  {
  }
  
@@ -112,7 +112,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  #endif /* CONFIG_GPIOLIB */
  
  /********************************/
-@@ -257,6 +328,7 @@ void ath_deinit_leds(struct ath_softc *s
+@@ -266,6 +337,7 @@ void ath_deinit_leds(struct ath_softc *s
  {
  	struct ath_led *led;
  
@@ -120,7 +120,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	while (!list_empty(&sc->leds)) {
  		led = list_first_entry(&sc->leds, struct ath_led, list);
  #ifdef CONFIG_GPIOLIB
-@@ -296,6 +368,7 @@ void ath_init_leds(struct ath_softc *sc)
+@@ -305,6 +377,7 @@ void ath_init_leds(struct ath_softc *sc)
  	}
  
  	ath_fill_led_pin(sc);