linux-kernel - RE: [PATCH 3/3] net: mdio-gpio: Add support for separate MDI and MDO gpio pins

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Message-ID: <724F6C6CDC8C86478473775085778C4E09E85DFE@ImsEx1.ims.dom>
Date:	Wed, 16 Apr 2014 02:45:50 +0000
From:	Chris Healy <chealy@...co-us.com>
To:	Guenter Roeck <linux@...ck-us.net>,
	Florian Fainelli <f.fainelli@...il.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"cphealy@...il.com" <cphealy@...il.com>
Subject: RE: [PATCH 3/3] net: mdio-gpio: Add support for separate MDI and
 MDO 	gpio pins

This is for a system with fixed assignments of input and output pins
(various variants of Kontron COMe).

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Tested-by: Chris Healy <cphealy@...il.com>
---
 drivers/net/phy/mdio-gpio.c |   34 +++++++++++++++++++++++++++++++---
 include/linux/mdio-gpio.h   |    2 ++
 2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
index fac211a..9c4defd 100644
--- a/drivers/net/phy/mdio-gpio.c
+++ b/drivers/net/phy/mdio-gpio.c
@@ -32,8 +32,8 @@

 struct mdio_gpio_info {
        struct mdiobb_ctrl ctrl;
-       int mdc, mdio;
-       int mdc_active_low, mdio_active_low;
+       int mdc, mdio, mdo;
+       int mdc_active_low, mdio_active_low, mdo_active_low;
 };

 static void *mdio_gpio_of_get_data(struct platform_device *pdev)
@@ -60,6 +60,12 @@ static void *mdio_gpio_of_get_data(struct platform_device *pdev)
        pdata->mdio = ret;
        pdata->mdio_active_low = flags & OF_GPIO_ACTIVE_LOW;

+       ret = of_get_gpio_flags(np, 2, &flags);
+       if (ret > 0) {
+               pdata->mdo = ret;
+               pdata->mdo_active_low = flags & OF_GPIO_ACTIVE_LOW;
+       }
+
        return pdata;
 }

@@ -68,6 +74,16 @@ static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
        struct mdio_gpio_info *bitbang =
                container_of(ctrl, struct mdio_gpio_info, ctrl);

+       if (bitbang->mdo) {
+               /* Separate output pin. Always set its value to high
+                * when changing direction. If direction is input,
+                * assume the pin serves as pull-up. If direction is
+                * output, the default value is high.
+                */
+               gpio_set_value(bitbang->mdo, 1 ^ bitbang->mdo_active_low);
+               return;
+       }
+
        if (dir)
                gpio_direction_output(bitbang->mdio,
                                      1 ^ bitbang->mdio_active_low);
@@ -88,7 +104,10 @@ 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 ^ bitbang->mdio_active_low);
+       if (bitbang->mdo)
+               gpio_set_value(bitbang->mdo, what ^ bitbang->mdo_active_low);
+       else
+               gpio_set_value(bitbang->mdio, what ^ bitbang->mdio_active_low);
 }

 static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
@@ -125,6 +144,8 @@ static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
        bitbang->mdc_active_low = pdata->mdc_active_low;
        bitbang->mdio = pdata->mdio;
        bitbang->mdio_active_low = pdata->mdio_active_low;
+       bitbang->mdo = pdata->mdo;
+       bitbang->mdo_active_low = pdata->mdo_active_low;

        new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
        if (!new_bus)
@@ -151,6 +172,13 @@ static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
        if (devm_gpio_request(dev, bitbang->mdio, "mdio"))
                goto out_free_bus;

+       if (bitbang->mdo) {
+               if (devm_gpio_request(dev, bitbang->mdo, "mdo"))
+                       goto out_free_bus;
+               gpio_direction_output(bitbang->mdo, 1);
+               gpio_direction_input(bitbang->mdio);
+       }
+
        gpio_direction_output(bitbang->mdc, 0);

        dev_set_drvdata(dev, new_bus);
diff --git a/include/linux/mdio-gpio.h b/include/linux/mdio-gpio.h
index 57e57fe..66c30a7 100644
--- a/include/linux/mdio-gpio.h
+++ b/include/linux/mdio-gpio.h
@@ -17,9 +17,11 @@ struct mdio_gpio_platform_data {
        /* GPIO numbers for bus pins */
        unsigned int mdc;
        unsigned int mdio;
+       unsigned int mdo;

        bool mdc_active_low;
        bool mdio_active_low;
+       bool mdo_active_low;

        unsigned int phy_mask;
        int irqs[PHY_MAX_ADDR];
--
1.7.9.7


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