From: Anand Moon <linux.amoon@gmail.com>
To: netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
devicetree@vger.kernel.org
Cc: Anand Moon <linux.amoon@gmail.com>,
Jerome Brunet <jbrunet@baylibre.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
Rob Herring <robh+dt@kernel.org>,
Kevin Hilman <khilman@baylibre.com>,
Giuseppe Cavallaro <peppe.cavallaro@st.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Jose Abreu <joabreu@synopsys.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
Emiliano Ingrassia <ingrassia@epigenesys.com>
Subject: [PATCHv1 3/3] net: stmmac: dwmac-meson8b: Add reset controller for ethernet phy
Date: Fri, 30 Jul 2021 01:40:52 +0530 [thread overview]
Message-ID: <20210729201100.3994-4-linux.amoon@gmail.com> (raw)
In-Reply-To: <20210729201100.3994-1-linux.amoon@gmail.com>
Add reset controller for Ethernet phy reset on every boot for
Amlogic SoC.
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Anand Moon <linux.amoon@gmail.com>
---
.../ethernet/stmicro/stmmac/dwmac-meson8b.c | 20 +++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
index c7a6588d9398..8b3b5e8c2a8a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -17,6 +17,7 @@
#include <linux/of_net.h>
#include <linux/mfd/syscon.h>
#include <linux/platform_device.h>
+#include <linux/reset.h>
#include <linux/stmmac.h>
#include "stmmac_platform.h"
@@ -95,6 +96,7 @@ struct meson8b_dwmac {
u32 tx_delay_ns;
u32 rx_delay_ps;
struct clk *timing_adj_clk;
+ struct reset_control *eth_reset;
};
struct meson8b_dwmac_clk_configs {
@@ -384,6 +386,17 @@ static int meson8b_init_prg_eth(struct meson8b_dwmac *dwmac)
meson8b_dwmac_mask_bits(dwmac, PRG_ETH0, PRG_ETH0_TX_AND_PHY_REF_CLK,
PRG_ETH0_TX_AND_PHY_REF_CLK);
+ /* Make sure the Ethernet PHY is properly reseted, as U-Boot may leave
+ * it at deasserted state, and thus it may fail to reset EMAC.
+ *
+ * This assumes the driver has exclusive access to the EPHY reset.
+ */
+ ret = reset_control_reset(dwmac->eth_reset);
+ if (ret) {
+ dev_err(dwmac->dev, "Cannot reset internal PHY\n");
+ return ret;
+ }
+
return 0;
}
@@ -465,6 +478,13 @@ static int meson8b_dwmac_probe(struct platform_device *pdev)
goto err_remove_config_dt;
}
+ dwmac->eth_reset = devm_reset_control_get_exclusive(dwmac->dev, "ethreset");
+ if (IS_ERR_OR_NULL(dwmac->eth_reset)) {
+ dev_err(dwmac->dev, "Failed to get Ethernet reset\n");
+ ret = PTR_ERR(dwmac->eth_reset);
+ goto err_remove_config_dt;
+ }
+
ret = meson8b_init_rgmii_delays(dwmac);
if (ret)
goto err_remove_config_dt;
--
2.32.0
next prev parent reply other threads:[~2021-07-29 20:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-29 20:10 [PATCHv1 0/3] Add Reset controller to Ethernet PHY Anand Moon
2021-07-29 20:10 ` [PATCHv1 1/3] arm64: dts: amlogic: add missing ethernet reset ID Anand Moon
2021-07-30 9:42 ` Philipp Zabel
2021-07-29 20:10 ` [PATCHv1 2/3] ARM: dts: meson: Use new reset id for reset controller Anand Moon
2021-07-30 9:45 ` Philipp Zabel
2021-07-30 18:48 ` Anand Moon
2021-07-29 20:10 ` Anand Moon [this message]
2021-07-29 20:21 ` [PATCHv1 3/3] net: stmmac: dwmac-meson8b: Add reset controller for ethernet phy Andrew Lunn
2021-08-03 20:45 ` Martin Blumenstingl
2021-08-03 20:41 ` [PATCHv1 0/3] Add Reset controller to Ethernet PHY Martin Blumenstingl
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