[PATCH] [v2] fec: convert to gpio descriptor

[PATCH] [v2] fec: convert to gpio descriptor

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

The driver can be trivially converted, as it only triggers the gpio
pin briefly to do a reset, and it already only supports DT.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2 changes, suggested by Andrew Lunn:
 - reorder header inclusions,
 - use dev_err_probe()
---
 drivers/net/ethernet/freescale/fec_main.c | 25 ++++++++---------------
 1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 5ff45b1a74a5..2716898e0b9b 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -56,12 +56,12 @@
 #include <linux/fec.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
-#include <linux/of_gpio.h>
 #include <linux/of_mdio.h>
 #include <linux/of_net.h>
 #include <linux/regulator/consumer.h>
 #include <linux/if_vlan.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/gpio/consumer.h>
 #include <linux/prefetch.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
@@ -4035,10 +4035,11 @@ static int fec_enet_init(struct net_device *ndev)
 #ifdef CONFIG_OF
 static int fec_reset_phy(struct platform_device *pdev)
 {
-	int err, phy_reset;
+	struct gpio_desc *phy_reset;
 	bool active_high = false;
 	int msec = 1, phy_post_delay = 0;
 	struct device_node *np = pdev->dev.of_node;
+	int err;
 
 	if (!np)
 		return 0;
@@ -4048,12 +4049,6 @@ static int fec_reset_phy(struct platform_device *pdev)
 	if (!err && msec > 1000)
 		msec = 1;
 
-	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))
-		return 0;
-
 	err = of_property_read_u32(np, "phy-reset-post-delay", &phy_post_delay);
 	/* valid reset duration should be less than 1s */
 	if (!err && phy_post_delay > 1000)
@@ -4061,20 +4056,18 @@ static int fec_reset_phy(struct platform_device *pdev)
 
 	active_high = of_property_read_bool(np, "phy-reset-active-high");
 
-	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;
-	}
+	phy_reset = devm_gpiod_get(&pdev->dev, "phy-reset",
+			active_high ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW);
+	if (IS_ERR(phy_reset))
+		return dev_err_probe(&pdev->dev, PTR_ERR(phy_reset),
+				     "failed to get phy-reset-gpios\n");
 
 	if (msec > 20)
 		msleep(msec);
 	else
 		usleep_range(msec * 1000, msec * 1000 + 1000);
 
-	gpio_set_value_cansleep(phy_reset, !active_high);
+	gpiod_set_value_cansleep(phy_reset, !active_high);
 
 	if (!phy_post_delay)
 		return 0;
-- 
2.39.0

Re: [PATCH] [v2] fec: convert to gpio descriptor

[Andrew Lunn]

On Thu, Jan 26, 2023 at 10:05:59PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The driver can be trivially converted, as it only triggers the gpio
> pin briefly to do a reset, and it already only supports DT.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH] [v2] fec: convert to gpio descriptor

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Thu, 26 Jan 2023 22:05:59 +0100 you wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The driver can be trivially converted, as it only triggers the gpio
> pin briefly to do a reset, and it already only supports DT.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> 
> [...]

Here is the summary with links:
  - [v2] fec: convert to gpio descriptor
    https://git.kernel.org/netdev/net-next/c/468ba54bd616

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
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Re: [PATCH] [v2] fec: convert to gpio descriptor

[Marc Kleine-Budde]

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On 26.01.2023 22:05:59, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The driver can be trivially converted, as it only triggers the gpio
> pin briefly to do a reset, and it already only supports DT.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

On current net-next/main 6a8ab436831d ("Merge branch
'add-support-for-the-the-vsc7512-internal-copper-phys'") this causes the
riot board (arch/arm/boot/dts/imx6dl-riotboard.dts) to not probe the
fec:

| Jan 31 16:32:12 riot kernel: fec 2188000.ethernet: error -ENOENT: failed to get phy-reset-gpios
| Jan 31 16:32:12 riot kernel: fec: probe of 2188000.ethernet failed with error -2

reverting 468ba54bd616 ("fec: convert to gpio descriptor") solves the
problem.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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Re: [PATCH] [v2] fec: convert to gpio descriptor

[Andrew Lunn]

On Tue, Jan 31, 2023 at 04:38:51PM +0100, Marc Kleine-Budde wrote:
> On 26.01.2023 22:05:59, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@arndb.de>
> > 
> > The driver can be trivially converted, as it only triggers the gpio
> > pin briefly to do a reset, and it already only supports DT.
> > 
> > Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> 
> On current net-next/main 6a8ab436831d ("Merge branch
> 'add-support-for-the-the-vsc7512-internal-copper-phys'") this causes the
> riot board (arch/arm/boot/dts/imx6dl-riotboard.dts) to not probe the
> fec:
> 
> | Jan 31 16:32:12 riot kernel: fec 2188000.ethernet: error -ENOENT: failed to get phy-reset-gpios
> | Jan 31 16:32:12 riot kernel: fec: probe of 2188000.ethernet failed with error -2

Hi Marc

Could you try swapping the devm_gpiod_get() for
devm_gpiod_get_optional().

It is kind of hidden, but:

-       else if (!gpio_is_valid(phy_reset))
-               return 0;

made the GPIO optional, since -2 is not a valid GPIO number and so it
would silently return.

The real fix will need to be a bit more complex, since we don't want
to do the sleeps etc if the GPIO is not present.

	Andrew