On some systems (such as the Qualcomm APQ8060 Dragonboard) the
RESET signal of the SMSC911x is not pulled up by a resistor but
connected to a GPIO line, so that the operating system must
explicitly deassert RESET before use.
Support this in the SMSC911x driver so this ethernet connector
can be used on such targets.
Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
---
ChangeLog v1->v2:
- Use devm_gpiod_request_optiona() and request the line with
GPIOD_OUT_LOW so it is deasserted immediately if active.
---
drivers/net/ethernet/smsc/smsc911x.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/net/ethernet/smsc/smsc911x.c
b/drivers/net/ethernet/smsc/smsc911x.c
index ca3134540d2d..8ab8d4b9614b 100644
--- a/drivers/net/ethernet/smsc/smsc911x.c
+++ b/drivers/net/ethernet/smsc/smsc911x.c
@@ -62,6 +62,7 @@
#include <linux/acpi.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
+#include <linux/gpio/consumer.h>
#include "smsc911x.h"
@@ -147,6 +148,9 @@ struct smsc911x_data {
/* regulators */
struct regulator_bulk_data supplies[SMSC911X_NUM_SUPPLIES];
+ /* Reset GPIO */
+ struct gpio_desc *reset_gpiod;
+
/* clock */
struct clk *clk;
};
@@ -438,6 +442,11 @@ static int smsc911x_request_resources(struct
platform_device *pdev)
netdev_err(ndev, "couldn't get regulators %d\n",
ret);
+ /* Request optional RESET GPIO */
+ pdata->reset_gpiod = devm_gpiod_get_optional(&pdev->dev,
+ "reset",
+ GPIOD_OUT_LOW);
+
/* Request clock */
pdata->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(pdata->clk))
--
2.7.4
