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Message-Id: <20230720072304.3358701-2-m.felsch@pengutronix.de>
Date: Thu, 20 Jul 2023 09:23:04 +0200
From: Marco Felsch <m.felsch@...gutronix.de>
To: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org,
conor+dt@...nel.org,
peppe.cavallaro@...com,
alexandre.torgue@...s.st.com,
joabreu@...opsys.com,
mcoquelin.stm32@...il.com
Cc: devicetree@...r.kernel.org,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
kernel@...gutronix.de,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH net-next v3 2/2] net: stmmac: add support for phy-supply
Add generic phy-supply handling support to control the phy regulator to
avoid handling it within the glue code. Use the generic stmmac_platform
code to register a possible phy-supply and the stmmac_main code to
handle the power on/off.
Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
---
Changelog
v3:
- rebased onto net-next/main
- fixed changelog style
v2:
- adapt stmmac_phy_power
- move power-on/off into stmmac_main to handle WOL
- adapt commit message
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 58 ++++++++++++++++++-
.../ethernet/stmicro/stmmac/stmmac_platform.c | 10 ++++
include/linux/stmmac.h | 1 +
3 files changed, 68 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index e7ca52f0d2f2d..6ffb03abddfd9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -31,6 +31,7 @@
#include <linux/pm_runtime.h>
#include <linux/prefetch.h>
#include <linux/pinctrl/consumer.h>
+#include <linux/regulator/consumer.h>
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/seq_file.h>
@@ -1128,6 +1129,55 @@ static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
}
}
+/**
+ * stmmac_phy_power - PHY regulator on/off
+ * @priv: driver private structure
+ * @enable: turn on the regulator if true else turn it off
+ * Enable or disable the regulator powering the PHY.
+ */
+static int stmmac_phy_power(struct stmmac_priv *priv, bool enable)
+{
+ struct regulator *regulator = priv->plat->phy_regulator;
+ struct device *dev = priv->device;
+
+ if (!regulator)
+ return 0;
+
+ if (enable) {
+ int ret;
+
+ ret = regulator_enable(regulator);
+ if (ret)
+ dev_err(dev, "Fail to enable regulator\n");
+
+ return ret;
+ }
+
+ regulator_disable(regulator);
+
+ return 0;
+}
+
+/**
+ * stmmac_phy_power_on - PHY regulator on
+ * @priv: driver private structure
+ * Enable the PHY regulator
+ */
+static int stmmac_phy_power_on(struct stmmac_priv *priv)
+{
+ return stmmac_phy_power(priv, true);
+}
+
+/**
+ * stmmac_phy_power_off - PHY regulator off
+ * @priv: driver private structure
+ * Disable the PHY regulator
+ */
+static void stmmac_phy_power_off(struct stmmac_priv *priv)
+{
+ stmmac_phy_power(priv, false);
+}
+
/**
* stmmac_init_phy - PHY initialization
* @dev: net device structure
@@ -1253,7 +1303,8 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
return PTR_ERR(phylink);
priv->phylink = phylink;
- return 0;
+
+ return stmmac_phy_power_on(priv);
}
static void stmmac_display_rx_rings(struct stmmac_priv *priv,
@@ -7588,6 +7639,7 @@ void stmmac_dvr_remove(struct device *dev)
if (priv->hw->pcs != STMMAC_PCS_TBI &&
priv->hw->pcs != STMMAC_PCS_RTBI)
stmmac_mdio_unregister(ndev);
+ stmmac_phy_power_off(priv);
destroy_workqueue(priv->wq);
mutex_destroy(&priv->lock);
bitmap_free(priv->af_xdp_zc_qps);
@@ -7651,6 +7703,8 @@ int stmmac_suspend(struct device *dev)
if (device_may_wakeup(priv->device))
phylink_speed_down(priv->phylink, false);
phylink_suspend(priv->phylink, false);
+ if (!priv->plat->use_phy_wol)
+ stmmac_phy_power_off(priv);
}
rtnl_unlock();
@@ -7733,6 +7787,8 @@ int stmmac_resume(struct device *dev)
priv->irq_wake = 0;
} else {
pinctrl_pm_select_default_state(priv->device);
+ if (!priv->plat->use_phy_wol)
+ stmmac_phy_power_on(priv);
/* reset the phy so that it's ready */
if (priv->mii)
stmmac_mdio_reset(priv->mii);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 23d53ea04b24d..18988da4614cd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -11,6 +11,7 @@
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/of.h>
@@ -424,6 +425,15 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
if (plat->interface < 0)
plat->interface = plat->phy_interface;
+ /* Optional regulator for PHY */
+ plat->phy_regulator = devm_regulator_get_optional(&pdev->dev, "phy");
+ if (IS_ERR(plat->phy_regulator)) {
+ if (PTR_ERR(plat->phy_regulator) == -EPROBE_DEFER)
+ return ERR_CAST(plat->phy_regulator);
+ dev_info(&pdev->dev, "No regulator found\n");
+ plat->phy_regulator = NULL;
+ }
+
/* Some wrapper drivers still rely on phy_node. Let's save it while
* they are not converted to phylink. */
plat->phy_node = of_parse_phandle(np, "phy-handle", 0);
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index ef67dba775d04..b5d2d75de2759 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -222,6 +222,7 @@ struct plat_stmmacenet_data {
int phy_addr;
int interface;
phy_interface_t phy_interface;
+ struct regulator *phy_regulator;
struct stmmac_mdio_bus_data *mdio_bus_data;
struct device_node *phy_node;
struct device_node *phylink_node;
--
2.39.2
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