[PATCH] net: fec: fix conversion to gpiod API

Dmitry Torokhov
2023-01-31T22:48:34Z

The reset line is optional, so we should be using
devm_gpiod_get_optional() and not abort probing if it is not available.
Also, gpiolib already handles phy-reset-active-high, continuing handling
it directly in the driver when using gpiod API results in flipped logic.

While at this convert phy properties parsing from OF to generic device
properties to avoid #ifdef-ery.

Fixes: 468ba54bd616 ("fec: convert to gpio descriptor")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
drivers/net/ethernet/freescale/fec_main.c | 36 ++++++++---------------
1 file changed, 12 insertions(+), 24 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 2716898e0b9b..c2b54a31541e 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -27,6 +27,7 @@
#include <linux/string.h>
#include <linux/pm_runtime.h>
#include <linux/ptrace.h>
+#include <linux/err.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
@@ -65,6 +66,7 @@
#include <linux/prefetch.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
+#include <linux/property.h>
#include <soc/imx/cpuidle.h>
#include <linux/filter.h>
#include <linux/bpf.h>
@@ -4032,42 +4034,38 @@ static int fec_enet_init(struct net_device *ndev)
return ret;
}

-#ifdef CONFIG_OF
static int fec_reset_phy(struct platform_device *pdev)
{
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;
-
- err = of_property_read_u32(np, "phy-reset-duration", &msec);
+ err = device_property_read_u32(&pdev->dev, "phy-reset-duration", &msec);
/* A sane reset duration should not be longer than 1s */
if (!err && msec > 1000)
msec = 1;

- err = of_property_read_u32(np, "phy-reset-post-delay", &phy_post_delay);
+ err = device_property_read_u32(&pdev->dev, "phy-reset-post-delay",
+ &phy_post_delay);
/* valid reset duration should be less than 1s */
if (!err && phy_post_delay > 1000)
return -EINVAL;

- active_high = of_property_read_bool(np, "phy-reset-active-high");
-
- phy_reset = devm_gpiod_get(&pdev->dev, "phy-reset",
- active_high ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW);
+ phy_reset = devm_gpiod_get_optional(&pdev->dev, "phy-reset",
+ GPIOD_OUT_HIGH);
if (IS_ERR(phy_reset))
return dev_err_probe(&pdev->dev, PTR_ERR(phy_reset),
- "failed to get phy-reset-gpios\n");
+ "failed to request phy-reset-gpios\n");
+
+ if (!phy_reset)
+ return 0;

if (msec > 20)
msleep(msec);
else
usleep_range(msec * 1000, msec * 1000 + 1000);

- gpiod_set_value_cansleep(phy_reset, !active_high);
+ gpiod_set_value_cansleep(phy_reset, 0);

if (!phy_post_delay)
return 0;
@@ -4080,16 +4078,6 @@ static int fec_reset_phy(struct platform_device *pdev)

return 0;
}
-#else /* CONFIG_OF */
-static int fec_reset_phy(struct platform_device *pdev)
-{
- /*
- * In case of platform probe, the reset has been done
- * by machine code.
- */
- return 0;
-}
-#endif /* CONFIG_OF */

static void
fec_enet_get_queue_num(struct platform_device *pdev, int *num_tx, int *num_rx)
--
2.39.1.456.gfc5497dd1b-goog

--
Dmitry