[PATCH net] net: dsa: mt7530: don't build GPIO support if !GPIOLIB

[DENG Qingfang]

The new GPIO support may be optional at runtime, but it requires
building against gpiolib:

ERROR: modpost: "gpiochip_get_data" [drivers/net/dsa/mt7530.ko]
undefined!
ERROR: modpost: "devm_gpiochip_add_data_with_key"
[drivers/net/dsa/mt7530.ko] undefined!

Add #ifdef to exclude GPIO support if GPIOLIB is not enabled.

Fixes: 429a0edeefd8 ("net: dsa: mt7530: MT7530 optional GPIO support")
Reported-by: Arnd Bergmann <a...@arndb.de>
Signed-off-by: DENG Qingfang <dqf...@gmail.com>
---
 drivers/net/dsa/mt7530.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index c17de2bcf2fe..f06f5fa2f898 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -1624,6 +1624,7 @@ mtk_get_tag_protocol(struct dsa_switch *ds, int port,
        }
 }
 
+#ifdef CONFIG_GPIOLIB
 static inline u32
 mt7530_gpio_to_bit(unsigned int offset)
 {
@@ -1726,6 +1727,7 @@ mt7530_setup_gpio(struct mt7530_priv *priv)
 
        return devm_gpiochip_add_data(dev, gc, priv);
 }
+#endif /* CONFIG_GPIOLIB */
 
 static int
 mt7530_setup(struct dsa_switch *ds)
@@ -1868,11 +1870,13 @@ mt7530_setup(struct dsa_switch *ds)
                }
        }
 
+#ifdef CONFIG_GPIOLIB
        if (of_property_read_bool(priv->dev->of_node, "gpio-controller")) {
                ret = mt7530_setup_gpio(priv);
                if (ret)
                        return ret;
        }
+#endif /* CONFIG_GPIOLIB */
 
        mt7530_setup_port5(ds, interface);
 
-- 
2.25.1