Merge branch 'rk3308-gmac'

Tobias Schramm says:

====================
Add support for RK3308 gmac

The Rockchip RK3308 SoC features an internal gmac. Only the signals
required for RMII are exposed so it is limited to 10/100 Mbit/s operation.
This patchset adds support for it.
I've tested the patchset on a Rock Pi S, works fine.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/rockchip-dwmac.yaml

@@ -19,6 +19,7 @@ select:
           - rockchip,rk3128-gmac
           - rockchip,rk3228-gmac
           - rockchip,rk3288-gmac
+          - rockchip,rk3308-gmac
           - rockchip,rk3328-gmac
           - rockchip,rk3366-gmac
           - rockchip,rk3368-gmac
@@ -38,6 +39,7 @@ properties:
           - rockchip,rk3128-gmac
           - rockchip,rk3228-gmac
           - rockchip,rk3288-gmac
+          - rockchip,rk3308-gmac
           - rockchip,rk3328-gmac
           - rockchip,rk3366-gmac
           - rockchip,rk3368-gmac

arch/arm64/boot/dts/rockchip/rk3308.dtsi

@@ -637,6 +637,28 @@ nfc: nand-controller@ff4b0000 {
 		status = "disabled";
 	};
 
+	gmac: ethernet@ff4e0000 {
+		compatible = "rockchip,rk3308-gmac";
+		reg = <0x0 0xff4e0000 0x0 0x10000>;
+		interrupts = <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "macirq";
+		clocks = <&cru SCLK_MAC>, <&cru SCLK_MAC_RX_TX>,
+			 <&cru SCLK_MAC_RX_TX>, <&cru SCLK_MAC_REF>,
+			 <&cru SCLK_MAC>, <&cru ACLK_MAC>,
+			 <&cru PCLK_MAC>, <&cru SCLK_MAC_RMII>;
+		clock-names = "stmmaceth", "mac_clk_rx",
+			      "mac_clk_tx", "clk_mac_ref",
+			      "clk_mac_refout", "aclk_mac",
+			      "pclk_mac", "clk_mac_speed";
+		phy-mode = "rmii";
+		pinctrl-names = "default";
+		pinctrl-0 = <&rmii_pins &mac_refclk_12ma>;
+		resets = <&cru SRST_MAC_A>;
+		reset-names = "stmmaceth";
+		rockchip,grf = <&grf>;
+		status = "disabled";
+	};
+
 	cru: clock-controller@ff500000 {
 		compatible = "rockchip,rk3308-cru";
 		reg = <0x0 0xff500000 0x0 0x1000>;

drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c

@@ -482,6 +482,54 @@ static const struct rk_gmac_ops rk3288_ops = {
 	.set_rmii_speed = rk3288_set_rmii_speed,
 };
 
+#define RK3308_GRF_MAC_CON0		0x04a0
+
+/* RK3308_GRF_MAC_CON0 */
+#define RK3308_GMAC_PHY_INTF_SEL_RMII	(GRF_CLR_BIT(2) | GRF_CLR_BIT(3) | \
+					GRF_BIT(4))
+#define RK3308_GMAC_FLOW_CTRL		GRF_BIT(3)
+#define RK3308_GMAC_FLOW_CTRL_CLR	GRF_CLR_BIT(3)
+#define RK3308_GMAC_SPEED_10M		GRF_CLR_BIT(0)
+#define RK3308_GMAC_SPEED_100M		GRF_BIT(0)
+
+static void rk3308_set_to_rmii(struct rk_priv_data *bsp_priv)
+{
+	struct device *dev = &bsp_priv->pdev->dev;
+
+	if (IS_ERR(bsp_priv->grf)) {
+		dev_err(dev, "Missing rockchip,grf property\n");
+		return;
+	}
+
+	regmap_write(bsp_priv->grf, RK3308_GRF_MAC_CON0,
+		     RK3308_GMAC_PHY_INTF_SEL_RMII);
+}
+
+static void rk3308_set_rmii_speed(struct rk_priv_data *bsp_priv, int speed)
+{
+	struct device *dev = &bsp_priv->pdev->dev;
+
+	if (IS_ERR(bsp_priv->grf)) {
+		dev_err(dev, "Missing rockchip,grf property\n");
+		return;
+	}
+
+	if (speed == 10) {
+		regmap_write(bsp_priv->grf, RK3308_GRF_MAC_CON0,
+			     RK3308_GMAC_SPEED_10M);
+	} else if (speed == 100) {
+		regmap_write(bsp_priv->grf, RK3308_GRF_MAC_CON0,
+			     RK3308_GMAC_SPEED_100M);
+	} else {
+		dev_err(dev, "unknown speed value for RMII! speed=%d", speed);
+	}
+}
+
+static const struct rk_gmac_ops rk3308_ops = {
+	.set_to_rmii = rk3308_set_to_rmii,
+	.set_rmii_speed = rk3308_set_rmii_speed,
+};
+
 #define RK3328_GRF_MAC_CON0	0x0900
 #define RK3328_GRF_MAC_CON1	0x0904
 #define RK3328_GRF_MAC_CON2	0x0908
@@ -1477,6 +1525,7 @@ static const struct of_device_id rk_gmac_dwmac_match[] = {
 	{ .compatible = "rockchip,rk3128-gmac", .data = &rk3128_ops },
 	{ .compatible = "rockchip,rk3228-gmac", .data = &rk3228_ops },
 	{ .compatible = "rockchip,rk3288-gmac", .data = &rk3288_ops },
+	{ .compatible = "rockchip,rk3308-gmac", .data = &rk3308_ops },
 	{ .compatible = "rockchip,rk3328-gmac", .data = &rk3328_ops },
 	{ .compatible = "rockchip,rk3366-gmac", .data = &rk3366_ops },
 	{ .compatible = "rockchip,rk3368-gmac", .data = &rk3368_ops },