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kernel
os
linux
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>
authored by
Guenter Roeck
and committed by
David S. Miller
1d251481
78cdb079
+16
-6
+13
-6
drivers/net/phy/mdio-gpio.c
+13
-6
drivers/net/phy/mdio-gpio.c
···
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struct mdio_gpio_info {
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struct mdiobb_ctrl ctrl;
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int mdc, mdio;
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int mdc_active_low, mdio_active_low;
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};
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static void *mdio_gpio_of_get_data(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct mdio_gpio_platform_data *pdata;
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enum of_gpio_flags flags;
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int ret;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return NULL;
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-
ret = of_get_gpio(np, 0);
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ret = of_get_gpio_flags(np, 0, &flags);
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if (ret < 0)
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return NULL;
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pdata->mdc = ret;
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pdata->mdc_active_low = flags & OF_GPIO_ACTIVE_LOW;
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-
ret = of_get_gpio(np, 1);
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ret = of_get_gpio_flags(np, 1, &flags);
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if (ret < 0)
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return NULL;
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pdata->mdio = ret;
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pdata->mdio_active_low = flags & OF_GPIO_ACTIVE_LOW;
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return pdata;
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}
···
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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if (dir)
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-
gpio_direction_output(bitbang->mdio, 1);
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gpio_direction_output(bitbang->mdio,
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1 ^ bitbang->mdio_active_low);
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else
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gpio_direction_input(bitbang->mdio);
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}
···
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struct mdio_gpio_info *bitbang =
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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-
return gpio_get_value(bitbang->mdio);
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return gpio_get_value(bitbang->mdio) ^ bitbang->mdio_active_low;
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}
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static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
···
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struct mdio_gpio_info *bitbang =
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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gpio_set_value(bitbang->mdio, what);
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gpio_set_value(bitbang->mdio, what ^ bitbang->mdio_active_low);
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}
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static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
···
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struct mdio_gpio_info *bitbang =
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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gpio_set_value(bitbang->mdc, what);
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gpio_set_value(bitbang->mdc, what ^ bitbang->mdc_active_low);
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}
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static struct mdiobb_ops mdio_gpio_ops = {
···
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bitbang->ctrl.ops = &mdio_gpio_ops;
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bitbang->ctrl.reset = pdata->reset;
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bitbang->mdc = pdata->mdc;
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bitbang->mdc_active_low = pdata->mdc_active_low;
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bitbang->mdio = pdata->mdio;
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bitbang->mdio_active_low = pdata->mdio_active_low;
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new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
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if (!new_bus)