[PATCH] [wireless-next] mt76: fix building without CONFIG_LEDS_CLASS

[Arnd Bergmann]

When CONFIG_LEDS_CLASS is disabled, or it is a loadable module while
mt76 is built-in, we run into a link error:

drivers/net/wireless/mediatek/mt76/mac80211.o: In function 
`mt76_register_device':
mac80211.c:(.text+0xb78): relocation truncated to fit: R_AARCH64_CALL26 against 
undefined symbol `devm_of_led_classdev_register'

We don't really need a hard dependency here as the driver can presumably
work just fine without LEDs, so this follows the iwlwifi example and
adds a separate Kconfig option for the LED support, this will be available
whenever it will link, and otherwise the respective code gets left out from
the driver object.

Fixes: 17f1de56df05 ("mt76: add common code shared between multiple chipsets")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/net/wireless/mediatek/mt76/Kconfig       | 5 +++++
 drivers/net/wireless/mediatek/mt76/mac80211.c    | 8 +++++---
 drivers/net/wireless/mediatek/mt76/mt76x2_init.c | 6 ++++--
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/Kconfig 
b/drivers/net/wireless/mediatek/mt76/Kconfig
index fc05d79c80d0..9d12c1f5284e 100644
--- a/drivers/net/wireless/mediatek/mt76/Kconfig
+++ b/drivers/net/wireless/mediatek/mt76/Kconfig
@@ -8,3 +8,8 @@ config MT76x2E
        depends on PCI
        ---help---
          This adds support for MT7612/MT7602/MT7662-based wireless PCIe 
devices.
+
+config MT76_LEDS
+       bool "LED support for MT76"
+       depends on MT76_CORE
+       depends on LEDS_CLASS=y || MT76_CORE=LEDS_CLASS
diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c 
b/drivers/net/wireless/mediatek/mt76/mac80211.c
index 3acf0e175d71..144e312a9407 100644
--- a/drivers/net/wireless/mediatek/mt76/mac80211.c
+++ b/drivers/net/wireless/mediatek/mt76/mac80211.c
@@ -295,9 +295,11 @@ int mt76_register_device(struct mt76_dev *dev, bool vht,
        mt76_check_sband(dev, NL80211_BAND_2GHZ);
        mt76_check_sband(dev, NL80211_BAND_5GHZ);
 
-       ret = mt76_led_init(dev);
-       if (ret)
-               return ret;
+       if (IS_ENABLED(CONFIG_MT76_LEDS)) {
+               ret = mt76_led_init(dev);
+               if (ret)
+                       return ret;
+       }
 
        return ieee80211_register_hw(hw);
 }
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2_init.c 
b/drivers/net/wireless/mediatek/mt76/mt76x2_init.c
index 4373a2ba5143..0c9d02af205d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x2_init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2_init.c
@@ -849,8 +849,10 @@ int mt76x2_register_device(struct mt76x2_dev *dev)
        mt76x2_dfs_init_detector(dev);
 
        /* init led callbacks */
-       dev->mt76.led_cdev.brightness_set = mt76x2_led_set_brightness;
-       dev->mt76.led_cdev.blink_set = mt76x2_led_set_blink;
+       if (IS_ENABLED(CONFIG_MT76_LEDS)) {
+               dev->mt76.led_cdev.brightness_set = mt76x2_led_set_brightness;
+               dev->mt76.led_cdev.blink_set = mt76x2_led_set_blink;
+       }
 
        ret = mt76_register_device(&dev->mt76, true, mt76x2_rates,
                                   ARRAY_SIZE(mt76x2_rates));
-- 
2.9.0