[PATCH 2/3 v2] net: smsc911x: request and deassert optional RESET GPIO
From: Linus Walleij <hidden>
Date: 2016-08-24 13:00:17
Subsystem:
networking drivers, smsc911x ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Steve Glendinning, Linus Torvalds
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 <redacted> --- 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