From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: robh+dt@kernel.org, andrew@lunn.ch, f.fainelli@gmail.com,
linux-amlogic@lists.infradead.org, devicetree@vger.kernel.org
Cc: jianxin.pan@amlogic.com, davem@davemloft.net,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Subject: [PATCH v3 6/8] net: stmmac: dwmac-meson8b: Fetch the "timing-adjustment" clock
Date: Tue, 12 May 2020 23:11:01 +0200 [thread overview]
Message-ID: <20200512211103.530674-7-martin.blumenstingl@googlemail.com> (raw)
In-Reply-To: <20200512211103.530674-1-martin.blumenstingl@googlemail.com>
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.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c | 8 ++++++++
1 file changed, 8 insertions(+)
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;
--
2.26.2
next prev parent reply other threads:[~2020-05-12 21:11 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-12 21:10 [PATCH v3 0/8] dwmac-meson8b Ethernet RX delay configuration Martin Blumenstingl
2020-05-12 21:10 ` [PATCH v3 1/8] dt-bindings: net: meson-dwmac: Add the amlogic,rx-delay-ns property Martin Blumenstingl
2020-05-24 21:28 ` Pavel Machek
2020-05-24 22:05 ` Florian Fainelli
2020-05-25 9:07 ` Pavel Machek
2020-05-25 13:57 ` Andrew Lunn
2020-05-25 20:17 ` Pavel Machek
2020-05-12 21:10 ` [PATCH v3 2/8] dt-bindings: net: dwmac-meson: Document the "timing-adjustment" clock Martin Blumenstingl
2020-05-12 21:10 ` [PATCH v3 3/8] net: stmmac: dwmac-meson8b: use FIELD_PREP instead of open-coding it Martin Blumenstingl
2020-05-12 21:10 ` [PATCH v3 4/8] net: stmmac: dwmac-meson8b: Move the documentation for the TX delay Martin Blumenstingl
2020-05-12 21:11 ` [PATCH v3 5/8] net: stmmac: dwmac-meson8b: Add the PRG_ETH0_ADJ_* bits Martin Blumenstingl
2020-05-12 21:11 ` Martin Blumenstingl [this message]
2020-05-12 21:11 ` [PATCH v3 7/8] net: stmmac: dwmac-meson8b: Make the clock enabling code re-usable Martin Blumenstingl
2020-05-12 21:11 ` [PATCH v3 8/8] net: stmmac: dwmac-meson8b: add support for the RX delay configuration Martin Blumenstingl
2020-05-13 19:23 ` [PATCH v3 0/8] dwmac-meson8b Ethernet " David Miller
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