mac80211 ath9k: force QCA953x clock to 25MHz

The QCA953x only supports 25 MHz refclk, however some OEMs set an
invalid bootstrap value for the REF_CLK option, which would break the
clock detection in ath9k.

Force the QCA953x refclk to 25MHz in ath9k, as this is (according to the
datasheet) the only valid frequency.

Signed-off-by: David Bauer <mail@david-bauer.net>

package/kernel/mac80211/patches/ath/552-ahb_of.patch

@@ -16,7 +16,7 @@
  
  static const struct platform_device_id ath9k_platform_id_table[] = {
  	{
-@@ -69,6 +77,235 @@ static const struct ath_bus_ops ath_ahb_
+@@ -69,6 +77,242 @@ static const struct ath_bus_ops ath_ahb_
  	.eeprom_read = ath_ahb_eeprom_read,
  };
  
@@ -232,7 +232,14 @@
 +		pdata->external_reset = data->wmac_reset;
 +	}
 +
-+	if (data->bootstrap_reg && data->bootstrap_ref) {
++	if (data->dev_id == AR9300_DEVID_AR953X) {
++		/*
++		 * QCA953x only supports 25MHz refclk.
++		 * Some vendors have an invalid bootstrap option
++		 * set, which would break the WMAC here.
++		 */
++		pdata->is_clk_25mhz = true;
++	} else if (data->bootstrap_reg && data->bootstrap_ref) {
 +		u32 t = ath79_reset_rr(data->bootstrap_reg);
 +		if (t & data->bootstrap_ref)
 +			pdata->is_clk_25mhz = false;
@@ -252,7 +259,7 @@
  static int ath_ahb_probe(struct platform_device *pdev)
  {
  	void __iomem *mem;
-@@ -80,6 +317,17 @@ static int ath_ahb_probe(struct platform
+@@ -80,6 +324,17 @@ static int ath_ahb_probe(struct platform
  	int ret = 0;
  	struct ath_hw *ah;
  	char hw_name[64];
@@ -270,7 +277,7 @@
  
  	if (!dev_get_platdata(&pdev->dev)) {
  		dev_err(&pdev->dev, "no platform data specified\n");
-@@ -122,13 +370,16 @@ static int ath_ahb_probe(struct platform
+@@ -122,13 +377,16 @@ static int ath_ahb_probe(struct platform
  	sc->mem = mem;
  	sc->irq = irq;
  
@@ -288,7 +295,7 @@
  	if (ret) {
  		dev_err(&pdev->dev, "failed to initialize device\n");
  		goto err_irq;
-@@ -159,6 +410,9 @@ static int ath_ahb_remove(struct platfor
+@@ -159,6 +417,9 @@ static int ath_ahb_remove(struct platfor
  		free_irq(sc->irq, sc);
  		ieee80211_free_hw(sc->hw);
  	}
@@ -298,7 +305,7 @@
  
  	return 0;
  }
-@@ -168,6 +422,9 @@ static struct platform_driver ath_ahb_dr
+@@ -168,6 +429,9 @@ static struct platform_driver ath_ahb_dr
  	.remove     = ath_ahb_remove,
  	.driver		= {
  		.name	= "ath9k",