diff mbox series

[RFC,v2,06/11] net: stmmac: dwmac-meson8b: Fetch the "timing-adjustment" clock

Message ID 20200429201644.1144546-7-martin.blumenstingl@googlemail.com
State New
Headers show
Series dwmac-meson8b Ethernet RX delay configuration | expand

Commit Message

Martin Blumenstingl April 29, 2020, 8:16 p.m. UTC 
The PRG_ETHERNET registers have a built-in timing adjustment circuit
which can provide the RX delay in RGMII mode. This is driven by an
external (to this IP, but internal to the SoC) clock input. Fetch this
clock as optional (even though it's there on all supported SoCs) since
we just learned about it and existing .dtbs don't specify it.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
index 70075628c58e..41f3ef6bea66 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -85,6 +85,7 @@  struct meson8b_dwmac {
 	phy_interface_t			phy_mode;
 	struct clk			*rgmii_tx_clk;
 	u32				tx_delay_ns;
+	struct clk			*timing_adj_clk;
 };
 
 struct meson8b_dwmac_clk_configs {
@@ -380,6 +381,13 @@  static int meson8b_dwmac_probe(struct platform_device *pdev)
 				 &dwmac->tx_delay_ns))
 		dwmac->tx_delay_ns = 2;
 
+	dwmac->timing_adj_clk = devm_clk_get_optional(dwmac->dev,
+						      "timing-adjustment");
+	if (IS_ERR(dwmac->timing_adj_clk)) {
+		ret = PTR_ERR(dwmac->timing_adj_clk);
+		goto err_remove_config_dt;
+	}
+
 	ret = meson8b_init_rgmii_tx_clk(dwmac);
 	if (ret)
 		goto err_remove_config_dt;