[v2,3/3] net/fec: add device tree probe support

It adds device tree probe support for fec driver.

Signed-off-by: Jason Liu <jason.hui@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
---
 Documentation/devicetree/bindings/net/fsl-fec.txt |   24 +++++
 drivers/net/fec.c                                 |   99 +++++++++++++++++++-
 2 files changed, 118 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/net/fsl-fec.txt

On Tue, Jul 5, 2011 at 9:13 AM, Shawn Guo <shawn.guo@linaro.org> wrote:
> It adds device tree probe support for fec driver.
>
> Signed-off-by: Jason Liu <jason.hui@linaro.org>
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Grant Likely <grant.likely@secretlab.ca>
> Acked-by: Grant Likely <grant.likely@secretlab.ca>

Minor comments below, but my Acked-by above still stands.

g.

> ---
>  Documentation/devicetree/bindings/net/fsl-fec.txt |   24 +++++
>  drivers/net/fec.c                                 |   99 +++++++++++++++++++-
>  2 files changed, 118 insertions(+), 5 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/net/fsl-fec.txt
>
> diff --git a/Documentation/devicetree/bindings/net/fsl-fec.txt b/Documentation/devicetree/bindings/net/fsl-fec.txt
> new file mode 100644
> index 0000000..1dad888
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/fsl-fec.txt
> @@ -0,0 +1,24 @@
> +* Freescale Fast Ethernet Controller (FEC)
> +
> +Required properties:
> +- compatible : Should be "fsl,<soc>-fec"
> +- reg : Address and length of the register set for the device
> +- interrupts : Should contain fec interrupt
> +- phy-mode : String, operation mode of the PHY interface.
> +  Supported values are: "mii", "gmii", "sgmii", "tbi", "rmii",
> +  "rgmii", "rgmii-id", "rgmii-rxid", "rgmii-txid", "rtbi".
> +- gpios : Should specify the gpio for phy reset

Let's be explicit for the gpio property: phy-reset-gpios.

> +
> +Optional properties:
> +- local-mac-address : 6 bytes, mac address
> +
> +Example:
> +
> +fec@83fec000 {
> +       compatible = "fsl,imx51-fec", "fsl,imx27-fec";
> +       reg = <0x83fec000 0x4000>;
> +       interrupts = <87>;
> +       phy-mode = "mii";
> +       gpios = <&gpio1 14 0>; /* phy-reset, GPIO2_14 */
> +       local-mac-address = [00 04 9F 01 1B B9];
> +};
> diff --git a/drivers/net/fec.c b/drivers/net/fec.c
> index 7ae3f28..dec94f4 100644
> --- a/drivers/net/fec.c
> +++ b/drivers/net/fec.c
> @@ -44,6 +44,10 @@
>  #include <linux/platform_device.h>
>  #include <linux/phy.h>
>  #include <linux/fec.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_net.h>
>
>  #include <asm/cacheflush.h>
>
> @@ -78,6 +82,17 @@ static struct platform_device_id fec_devtype[] = {
>        { }
>  };
>
> +enum fec_type {
> +       IMX27_FEC,
> +       IMX28_FEC,
> +};
> +
> +static const struct of_device_id fec_dt_ids[] = {
> +       { .compatible = "fsl,imx27-fec", .data = &fec_devtype[IMX27_FEC], },
> +       { .compatible = "fsl,imx28-fec", .data = &fec_devtype[IMX28_FEC], },
> +       { /* sentinel */ }
> +};
> +
>  static unsigned char macaddr[ETH_ALEN];
>  module_param_array(macaddr, byte, NULL, 0);
>  MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
> @@ -734,8 +749,22 @@ static void __inline__ fec_get_mac(struct net_device *ndev)
>         */
>        iap = macaddr;
>
> +#ifdef CONFIG_OF
> +       /*
> +        * 2) from device tree data
> +        */
> +       if (!is_valid_ether_addr(iap)) {
> +               struct device_node *np = fep->pdev->dev.of_node;
> +               if (np) {
> +                       const char *mac = of_get_mac_address(np);
> +                       if (mac)
> +                               iap = (unsigned char *) mac;
> +               }
> +       }
> +#endif
> +
>        /*
> -        * 2) from flash or fuse (via platform data)
> +        * 3) from flash or fuse (via platform data)
>         */
>        if (!is_valid_ether_addr(iap)) {
>  #ifdef CONFIG_M5272
> @@ -748,7 +777,7 @@ static void __inline__ fec_get_mac(struct net_device *ndev)
>        }
>
>        /*
> -        * 3) FEC mac registers set by bootloader
> +        * 4) FEC mac registers set by bootloader
>         */
>        if (!is_valid_ether_addr(iap)) {
>                *((unsigned long *) &tmpaddr[0]) =
> @@ -1358,6 +1387,53 @@ static int fec_enet_init(struct net_device *ndev)
>        return 0;
>  }
>
> +#ifdef CONFIG_OF
> +static int __devinit fec_get_phy_mode_dt(struct platform_device *pdev)
> +{
> +       struct device_node *np = pdev->dev.of_node;
> +
> +       if (np)
> +               return of_get_phy_mode(np);
> +
> +       return -ENODEV;
> +}
> +
> +static int __devinit fec_reset_phy(struct platform_device *pdev)
> +{
> +       int err, phy_reset;
> +       struct device_node *np = pdev->dev.of_node;
> +
> +       if (!np)
> +               return -ENODEV;
> +
> +       phy_reset = of_get_gpio(np, 0);
> +       err = gpio_request_one(phy_reset, GPIOF_OUT_INIT_LOW, "phy-reset");
> +       if (err) {
> +               pr_warn("FEC: failed to get gpio phy-reset: %d\n", err);
> +               return err;
> +       }
> +
> +       msleep(1);
> +       gpio_set_value(phy_reset, 1);
> +
> +       return 0;
> +}
> +#else /* CONFIG_OF */
> +static inline int fec_get_phy_mode_dt(struct platform_device *pdev)
> +{
> +       return -ENODEV;
> +}
> +
> +static inline int fec_reset_phy(struct platform_device *pdev)
> +{
> +       /*
> +        * In case of platform probe, the reset has been done
> +        * by machine code.
> +        */
> +       return 0;

Perhaps platform code should be reworked to use GPIO also.

> +}
> +#endif /* CONFIG_OF */
> +
>  static int __devinit
>  fec_probe(struct platform_device *pdev)
>  {
> @@ -1366,6 +1442,11 @@ fec_probe(struct platform_device *pdev)
>        struct net_device *ndev;
>        int i, irq, ret = 0;
>        struct resource *r;
> +       const struct of_device_id *of_id;
> +
> +       of_id = of_match_device(fec_dt_ids, &pdev->dev);
> +       if (of_id)
> +               pdev->id_entry = of_id->data;
>
>        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>        if (!r)
> @@ -1397,9 +1478,16 @@ fec_probe(struct platform_device *pdev)
>
>        platform_set_drvdata(pdev, ndev);
>
> -       pdata = pdev->dev.platform_data;
> -       if (pdata)
> -               fep->phy_interface = pdata->phy;
> +       fep->phy_interface = fec_get_phy_mode_dt(pdev);
> +       if (fep->phy_interface < 0) {
> +               pdata = pdev->dev.platform_data;
> +               if (pdata)
> +                       fep->phy_interface = pdata->phy;
> +               else
> +                       fep->phy_interface = PHY_INTERFACE_MODE_MII;
> +       }
> +
> +       fec_reset_phy(pdev);
>
>        /* This device has up to three irqs on some platforms */
>        for (i = 0; i < 3; i++) {
> @@ -1534,6 +1622,7 @@ static struct platform_driver fec_driver = {
>  #ifdef CONFIG_PM
>                .pm     = &fec_pm_ops,
>  #endif
> +               .of_match_table = fec_dt_ids,
>        },
>        .id_table = fec_devtype,
>        .probe  = fec_probe,
> --
> 1.7.4.1
>
>
>