diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2014-04-15 19:16:41 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-04-16 15:09:51 -0400 |
| commit | 1d2514818a2c3d94dd250e6027cb928a4e192548 (patch) | |
| tree | c4ff94f2b9df1d5b96c5c46b2bc4d02b1167ed04 /drivers | |
| parent | 78cdb079685cd8365acaf9fce896137e7d60e1c1 (diff) | |
| download | linux-1d2514818a2c3d94dd250e6027cb928a4e192548.tar.bz2 | |
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')
| -rw-r--r-- | drivers/net/phy/mdio-gpio.c | 19 |
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) |