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authorLinus Walleij <linus.walleij@linaro.org>2016-09-07 15:53:42 +0200
committerDavid S. Miller <davem@davemloft.net>2016-09-07 21:05:54 -0700
commitdd0cb7dbb065f4acdd8d0597f122d0ed9e93f12e (patch)
tree34ac360424f2c57cbd658b3491efbaba391a6ef4 /drivers/net/ethernet/smsc
parent216559d9032704a7a5d2fcd3c9c086dd9f7cd557 (diff)
downloadlinux-dd0cb7dbb065f4acdd8d0597f122d0ed9e93f12e.tar.bz2
net: smsc911x: request and deassert optional RESET GPIO
On some systems (such as the Qualcomm APQ8060 Dragonboard) the RESET signal of the SMSC911x is not pulled up by a resistor (or the internal pull-up that will pull it up if the pin is not even connected) but instead 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. Notice that we request the line to go logical low (deassert) whilst the line on the actual component is active low. This is managed in the respective hardware description when specifying the GPIO line with e.g. device tree or ACPI. With device tree it looks like this in one case: reset-gpios = <&tlmm 30 GPIO_ACTIVE_LOW>; Which means that logically requesting the RESET line to be deasserted will result in the line being driven high, taking the device out of reset. Cc: Jeremy Linton <jeremy.linton@arm.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Jeremy Linton <jeremy.linton@arm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/smsc')
-rw-r--r--drivers/net/ethernet/smsc/smsc911x.c9
1 files changed, 9 insertions, 0 deletions
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))