[PATCH v4 14/21] net: stmmac: dwmac-sun8i: Prepare for second EMAC clock register

[Andre Przywara <andre.przywara@arm.com>]

The Allwinner H616 SoC has two EMAC controllers, with the second one
being tied to the internal PHY, but also using a separate EMAC clock
register.

To tell the driver about which clock register to use, we add a parameter
to our syscon phandle. The driver will use this value as an index into
the regmap, so that we can address more than the first register, if
needed.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
index 58e0511badba..c7951790ed98 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -1124,11 +1124,13 @@ static int sun8i_dwmac_probe(struct platform_device *pdev)
 	struct stmmac_resources stmmac_res;
 	struct sunxi_priv_data *gmac;
 	struct device *dev = &pdev->dev;
+	struct reg_field syscon_field;
 	phy_interface_t interface;
 	int ret;
 	struct stmmac_priv *priv;
 	struct net_device *ndev;
 	struct regmap *regmap;
+	u32 syscon_idx = 0;
 
 	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
 	if (ret)
@@ -1190,8 +1192,12 @@ static int sun8i_dwmac_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	gmac->regmap_field = devm_regmap_field_alloc(dev, regmap,
-						     *gmac->variant->syscon_field);
+	syscon_field = *gmac->variant->syscon_field;
+	ret = of_property_read_u32_index(pdev->dev.of_node, "syscon", 1,
+					 &syscon_idx);
+	if (!ret)
+		syscon_field.reg += syscon_idx * sizeof(u32);
+	gmac->regmap_field = devm_regmap_field_alloc(dev, regmap, syscon_field);
 	if (IS_ERR(gmac->regmap_field)) {
 		ret = PTR_ERR(gmac->regmap_field);
 		dev_err(dev, "Unable to map syscon register: %d\n", ret);
@@ -1263,6 +1269,8 @@ static const struct of_device_id sun8i_dwmac_match[] = {
 		.data = &emac_variant_a64 },
 	{ .compatible = "allwinner,sun50i-h6-emac",
 		.data = &emac_variant_h6 },
+	{ .compatible = "allwinner,sun50i-h616-emac",
+		.data = &emac_variant_h6 },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sun8i_dwmac_match);
-- 
2.17.5