net: fec_mxc: Add ref clock setup support for i.MX8M Mini/Nano/Plus

The FEC ref clock frequency on i.MX8M Mini/Nano/Plus was so far configured
via ad-hoc board code. Replace that with DM clock clk_set_rate() instead.
This way, the driver claims all its required clock and sets the ref clock
rate, without any need of architecture specific register fiddling.

Signed-off-by: Marek Vasut <marex@denx.de>

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index 1a6c18a..7a85771 100644 (file)
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -1196,6 +1196,33 @@ static void fec_gpio_reset(struct fec_priv *priv)
 }
 #endif
 
+static int fecmxc_set_ref_clk(struct clk *clk_ref, phy_interface_t interface)
+{
+       unsigned int freq;
+       int ret;
+
+       if (!CONFIG_IS_ENABLED(CLK_CCF))
+               return 0;
+
+       if (interface == PHY_INTERFACE_MODE_MII)
+               freq = 25000000;
+       else if (interface == PHY_INTERFACE_MODE_RMII)
+               freq = 50000000;
+       else if (interface == PHY_INTERFACE_MODE_RGMII ||
+                interface == PHY_INTERFACE_MODE_RGMII_ID ||
+                interface == PHY_INTERFACE_MODE_RGMII_RXID ||
+                interface == PHY_INTERFACE_MODE_RGMII_TXID)
+               freq = 125000000;
+       else
+               return -EINVAL;
+
+       ret = clk_set_rate(clk_ref, freq);
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
 static int fecmxc_probe(struct udevice *dev)
 {
        bool dm_mii_bus = true;
@@ -1253,6 +1280,11 @@ static int fecmxc_probe(struct udevice *dev)
 
                ret = clk_get_by_name(dev, "enet_clk_ref", &priv->clk_ref);
                if (!ret) {
+                       ret = fecmxc_set_ref_clk(&priv->clk_ref,
+                                                pdata->phy_interface);
+                       if (ret)
+                               return ret;
+
                        ret = clk_enable(&priv->clk_ref);
                        if (ret)
                                return ret;