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Date: Sun, 3 Jul 2011 15:23:12 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Shawn Guo <shawn.guo@...aro.org>
Cc: netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
devicetree-discuss@...ts.ozlabs.org, patches@...aro.org,
Jason Liu <jason.hui@...aro.org>,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] net/fec: add device tree probe support
On Sun, Jul 03, 2011 at 04:06:41PM +0800, Shawn Guo wrote:
> It adds device tree probe support for fec driver.
>
> Signed-off-by: Jason Liu <jason.hui@...aro.org>
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Grant Likely <grant.likely@...retlab.ca>
Minor comments below. After addressing them you can add my:
Acked-by: Grant Likely <grant.likely@...retlab.ca>
I don't see any reason not to merge this one in v3.1
g.
> ---
> Documentation/devicetree/bindings/net/fsl-fec.txt | 24 ++++
> drivers/net/fec.c | 120 ++++++++++++++++++++-
> 2 files changed, 139 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".
We don't have a common binding for this yet. Should be
"fsl,phy-mode".
> +- gpios : Should specify the gpio for phy reset
> +
> +Optional properties:
> +- local-mac-address : 6 bytes, mac address
> +
> +Example:
> +
> +fec@...ec000 {
> + 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..3ee05ff 100644
> --- a/drivers/net/fec.c
> +++ b/drivers/net/fec.c
> @@ -44,6 +44,9 @@
> #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 <asm/cacheflush.h>
>
> @@ -78,6 +81,17 @@ 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], },
Personally, I'd drop the fec_devtype array entirely and have discrete
structures for each, but that isn't a big enough objection to withhold
my acked-by.
> + { /* sentinel */ },
Drop the trailing comma.
> +};
> +
> static unsigned char macaddr[ETH_ALEN];
> module_param_array(macaddr, byte, NULL, 0);
> MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
> @@ -734,8 +748,25 @@ 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;
> + int err;
> + err = of_property_read_string(np,
> + "local-mac-address", &mac);
> + if (err)
> + iap = (unsigned char *) mac;
There is already a function for doing this. of_get_mac_address().
And mac address is *not* a string, it is a byte array.
> + }
> + }
> +#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 +779,7 @@ 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 +1389,72 @@ 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;
> + int err, i;
> + const char *pm, *phy_modes[] = {
> + [PHY_INTERFACE_MODE_MII] = "mii",
> + [PHY_INTERFACE_MODE_GMII] = "gmii",
> + [PHY_INTERFACE_MODE_SGMII] = "sgmii",
> + [PHY_INTERFACE_MODE_TBI] = "tbi",
> + [PHY_INTERFACE_MODE_RMII] = "rmii",
> + [PHY_INTERFACE_MODE_RGMII] = "rgmii",
> + [PHY_INTERFACE_MODE_RGMII_ID] = "rgmii-id",
> + [PHY_INTERFACE_MODE_RGMII_RXID] = "rgmii-rxid",
> + [PHY_INTERFACE_MODE_RGMII_TXID] = "rgmii-txid",
> + [PHY_INTERFACE_MODE_RTBI] = "rtbi",
> + };
The phymodes table should be defined outside of the function.
> +
> + if (np) {
> + err = of_property_read_string(np, "phy-mode", &pm);
> + if (err)
> + return err;
> + for (i = 0; i < ARRAY_SIZE(phy_modes); i++)
> + if (!strcasecmp(pm, phy_modes[i]))
> + return i;
> + }
> +
> + 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;
> +}
> +#endif /* CONFIG_OF */
> +
> static int __devinit
> fec_probe(struct platform_device *pdev)
> {
> @@ -1366,6 +1463,11 @@ 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 = (struct platform_device_id *) of_id->data;
of_id->data is a void*. You don't need the cast.
>
> r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> if (!r)
> @@ -1397,9 +1499,16 @@ 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 == -ENODEV) {
> + 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 +1643,7 @@ 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
>
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