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Date: Mon, 6 Dec 2021 11:13:25 +0100
From: Philippe Schenker <philippe.schenker@...adex.com>
To: netdev@...r.kernel.org, Joakim Zhang <qiangqing.zhang@....com>,
Fabio Estevam <festevam@...il.com>,
Fugang Duan <fugang.duan@....com>,
"David S . Miller" <davem@...emloft.net>,
Russell King <linux@...linux.org.uk>,
Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>
Cc: Philippe Schenker <philippe.schenker@...adex.com>,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH 1/2] net: fec: make fec_reset_phy not only usable once
inside fec_reset_phy devm_gpio_request_once is called hence making
the function only callable once as the gpio is not stored somewhere nor
freed at the end.
Create a new function to collect the data around phy-reset-gpio from
devicetree and store it in fec_enet_private. Make fec_reset_phy use
the data stored in fec_enet_private, so this function can be called
multiple times.
Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>
---
drivers/net/ethernet/freescale/fec.h | 6 ++
drivers/net/ethernet/freescale/fec_main.c | 94 +++++++++++++++--------
2 files changed, 69 insertions(+), 31 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index 7b4961daa254..466607bbf9cf 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -631,6 +631,12 @@ struct fec_enet_private {
int pps_enable;
unsigned int next_counter;
+ /* PHY reset signal */
+ bool phy_reset_active_high;
+ int phy_reset_duration;
+ int phy_reset_gpio;
+ int phy_reset_post_delay;
+
u64 ethtool_stats[];
};
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index bc418b910999..92840f18c48f 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -3588,62 +3588,90 @@ static int fec_enet_init(struct net_device *ndev)
}
#ifdef CONFIG_OF
-static int fec_reset_phy(struct platform_device *pdev)
+static int fec_reset_phy_probe(struct platform_device *pdev,
+ struct net_device *ndev)
{
- int err, phy_reset;
- bool active_high = false;
- int msec = 1, phy_post_delay = 0;
struct device_node *np = pdev->dev.of_node;
+ struct fec_enet_private *fep = netdev_priv(ndev);
+ int tmp, ret;
if (!np)
return 0;
- err = of_property_read_u32(np, "phy-reset-duration", &msec);
+ tmp = 1;
+ ret = of_property_read_u32(np, "phy-reset-duration", &tmp);
/* A sane reset duration should not be longer than 1s */
- if (!err && msec > 1000)
- msec = 1;
+ if (!ret && tmp > 1000)
+ tmp = 1;
+
+ fep->phy_reset_duration = tmp;
- phy_reset = of_get_named_gpio(np, "phy-reset-gpios", 0);
- if (phy_reset == -EPROBE_DEFER)
- return phy_reset;
- else if (!gpio_is_valid(phy_reset))
+ tmp = of_get_named_gpio(np, "phy-reset-gpios", 0);
+ if (tmp == -EPROBE_DEFER)
+ return tmp;
+ else if (!gpio_is_valid(tmp))
return 0;
- err = of_property_read_u32(np, "phy-reset-post-delay", &phy_post_delay);
+ fep->phy_reset_gpio = tmp;
+
+ tmp = 0;
+ ret = of_property_read_u32(np, "phy-reset-post-delay", &tmp);
/* valid reset duration should be less than 1s */
- if (!err && phy_post_delay > 1000)
+ if (!ret && tmp > 1000)
return -EINVAL;
- active_high = of_property_read_bool(np, "phy-reset-active-high");
+ fep->phy_reset_post_delay = tmp;
- err = devm_gpio_request_one(&pdev->dev, phy_reset,
- active_high ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
- "phy-reset");
- if (err) {
- dev_err(&pdev->dev, "failed to get phy-reset-gpios: %d\n", err);
- return err;
+ fep->phy_reset_active_high =
+ of_property_read_bool(np, "phy-reset-active-high");
+
+ ret = devm_gpio_request_one(&pdev->dev, fep->phy_reset_gpio,
+ fep->phy_reset_active_high ?
+ GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+ "phy-reset");
+ if (ret) {
+ dev_err(&pdev->dev, "failed to get phy-reset-gpios: %d\n", ret);
+ return ret;
}
- if (msec > 20)
- msleep(msec);
+ return 0;
+}
+
+static int fec_reset_phy(struct net_device *ndev)
+{
+ struct fec_enet_private *fep = netdev_priv(ndev);
+
+ gpio_set_value_cansleep(fep->phy_reset_gpio,
+ fep->phy_reset_active_high);
+
+ if (fep->phy_reset_duration > 20)
+ msleep(fep->phy_reset_duration);
else
- usleep_range(msec * 1000, msec * 1000 + 1000);
+ usleep_range(fep->phy_reset_duration * 1000,
+ fep->phy_reset_duration * 1000 + 1000);
- gpio_set_value_cansleep(phy_reset, !active_high);
+ gpio_set_value_cansleep(fep->phy_reset_gpio,
+ !fep->phy_reset_active_high);
- if (!phy_post_delay)
+ if (!fep->phy_reset_post_delay)
return 0;
- if (phy_post_delay > 20)
- msleep(phy_post_delay);
+ if (fep->phy_reset_post_delay > 20)
+ msleep(fep->phy_reset_post_delay);
else
- usleep_range(phy_post_delay * 1000,
- phy_post_delay * 1000 + 1000);
+ usleep_range(fep->phy_reset_post_delay * 1000,
+ fep->phy_reset_post_delay * 1000 + 1000);
return 0;
}
#else /* CONFIG_OF */
-static int fec_reset_phy(struct platform_device *pdev)
+static int fec_reset_phy_probe(struct platform_device *pdev,
+ struct net_device *ndev)
+{
+ return 0;
+}
+
+static int fec_reset_phy(struct net_device *ndev)
{
/*
* In case of platform probe, the reset has been done
@@ -3918,7 +3946,11 @@ fec_probe(struct platform_device *pdev)
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
- ret = fec_reset_phy(pdev);
+ ret = fec_reset_phy_probe(pdev, ndev);
+ if (ret)
+ goto failed_reset;
+
+ ret = fec_reset_phy(ndev);
if (ret)
goto failed_reset;
--
2.34.0
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