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authorGuenter Roeck <linux@roeck-us.net>2014-04-16 06:16:41 +0400
committerDavid S. Miller <davem@davemloft.net>2014-04-16 23:09:51 +0400
commit1d2514818a2c3d94dd250e6027cb928a4e192548 (patch)
treec4ff94f2b9df1d5b96c5c46b2bc4d02b1167ed04 /drivers/net/phy/mdio-gpio.c
parent78cdb079685cd8365acaf9fce896137e7d60e1c1 (diff)
downloadlinux-1d2514818a2c3d94dd250e6027cb928a4e192548.tar.xz
net: mdio-gpio: Add support for active low gpio pins
Some systems using mdio-gpio may use active-low gpio pins (eg with inverters or FETs connected to all or some of the gpio pins). Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/mdio-gpio.c')
-rw-r--r--drivers/net/phy/mdio-gpio.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
index e853066c805a..fac211a5001e 100644
--- a/drivers/net/phy/mdio-gpio.c
+++ b/drivers/net/phy/mdio-gpio.c
@@ -33,28 +33,32 @@
struct mdio_gpio_info {
struct mdiobb_ctrl ctrl;
int mdc, mdio;
+ int mdc_active_low, mdio_active_low;
};
static void *mdio_gpio_of_get_data(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct mdio_gpio_platform_data *pdata;
+ enum of_gpio_flags flags;
int ret;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
- ret = of_get_gpio(np, 0);
+ ret = of_get_gpio_flags(np, 0, &flags);
if (ret < 0)
return NULL;
pdata->mdc = ret;
+ pdata->mdc_active_low = flags & OF_GPIO_ACTIVE_LOW;
- ret = of_get_gpio(np, 1);
+ ret = of_get_gpio_flags(np, 1, &flags);
if (ret < 0)
return NULL;
pdata->mdio = ret;
+ pdata->mdio_active_low = flags & OF_GPIO_ACTIVE_LOW;
return pdata;
}
@@ -65,7 +69,8 @@ static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
container_of(ctrl, struct mdio_gpio_info, ctrl);
if (dir)
- gpio_direction_output(bitbang->mdio, 1);
+ gpio_direction_output(bitbang->mdio,
+ 1 ^ bitbang->mdio_active_low);
else
gpio_direction_input(bitbang->mdio);
}
@@ -75,7 +80,7 @@ static int mdio_get(struct mdiobb_ctrl *ctrl)
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
- return gpio_get_value(bitbang->mdio);
+ return gpio_get_value(bitbang->mdio) ^ bitbang->mdio_active_low;
}
static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
@@ -83,7 +88,7 @@ static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
- gpio_set_value(bitbang->mdio, what);
+ gpio_set_value(bitbang->mdio, what ^ bitbang->mdio_active_low);
}
static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
@@ -91,7 +96,7 @@ static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
- gpio_set_value(bitbang->mdc, what);
+ gpio_set_value(bitbang->mdc, what ^ bitbang->mdc_active_low);
}
static struct mdiobb_ops mdio_gpio_ops = {
@@ -117,7 +122,9 @@ static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
bitbang->ctrl.ops = &mdio_gpio_ops;
bitbang->ctrl.reset = pdata->reset;
bitbang->mdc = pdata->mdc;
+ bitbang->mdc_active_low = pdata->mdc_active_low;
bitbang->mdio = pdata->mdio;
+ bitbang->mdio_active_low = pdata->mdio_active_low;
new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
if (!new_bus)