| Message ID | 20200429201644.1144546-7-martin.blumenstingl@googlemail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | dwmac-meson8b Ethernet RX delay configuration | expand |
On Wed, Apr 29, 2020 at 10:16:39PM +0200, Martin Blumenstingl wrote: > 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> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Andrew
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;
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(+)