ath9k: parse the device configuration from an OF node

This allows setting the MAC address and specifying that the firmware
will be requested from userspace (because there might not be a hardware
EEPROM connected to the chip) for ath9k based PCI devices using
the device tree.

There is some out-of-tree code to "convert devicetree to
ath9k_platform_data" (for example in OpenWrt and LEDE) which becomes
obsolete with this patch.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index cfa3fe82ade3..b7c8ff9b4192 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -20,6 +20,8 @@
 #include <linux/slab.h>
 #include <linux/ath9k_platform.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_net.h>
 #include <linux/relay.h>
 #include <net/ieee80211_radiotap.h>
 
@@ -555,6 +557,42 @@ static int ath9k_init_platform(struct ath_softc *sc)
         return 0;
 }
 
+static int ath9k_of_init(struct ath_softc *sc)
+{
+        struct device_node *np = sc->dev->of_node;
+        struct ath_hw *ah = sc->sc_ah;
+        struct ath_common *common = ath9k_hw_common(ah);
+        enum ath_bus_type bus_type = common->bus_ops->ath_bus_type;
+        const char *mac;
+        char eeprom_name[100];
+        int ret;
+
+        if (!of_device_is_available(np))
+                return 0;
+
+        ath_dbg(common, CONFIG, "parsing configuration from OF node\n");
+
+        if (of_property_read_bool(np, "qca,no-eeprom")) {
+                /* ath9k-eeprom-<bus>-<id>.bin */
+                scnprintf(eeprom_name, sizeof(eeprom_name),
+                          "ath9k-eeprom-%s-%s.bin",
+                          ath_bus_type_to_string(bus_type), dev_name(ah->dev));
+
+                ret = ath9k_eeprom_request(sc, eeprom_name);
+                if (ret)
+                        return ret;
+        }
+
+        mac = of_get_mac_address(np);
+        if (mac)
+                ether_addr_copy(common->macaddr, mac);
+
+        ah->ah_flags &= ~AH_USE_EEPROM;
+        ah->ah_flags |= AH_NO_EEP_SWAP;
+
+        return 0;
+}
+
 static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
                             const struct ath_bus_ops *bus_ops)
 {
@@ -611,6 +649,10 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
         if (ret)
                 return ret;
 
+        ret = ath9k_of_init(sc);
+        if (ret)
+                return ret;
+
         if (ath9k_led_active_high != -1)
                 ah->config.led_active_high = ath9k_led_active_high == 1;