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Date:	Tue, 13 Mar 2012 09:18:59 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Stefan Roese <sr@...x.de>
CC:	netdev@...r.kernel.org,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	devicetree-discuss@...abs.org, spear-devel@...t.st.com
Subject: Re: [PATCH v2] stmmac: Add device-tree support

On 03/13/2012 02:23 AM, Stefan Roese wrote:
> This patch adds support to configure the STMMAC ethernet driver via
> device-tree instead of platform_data.
> 
> Currently, only the properties needed on SPEAr600 are provided. All
> other properties should be added once needed on other platforms.
> 
> Signed-off-by: Stefan Roese <sr@...x.de>
> Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
> ---
> v2:
> - Renamed stm -> st
> - Renamed compatible to "st,spear600-gmac"
> - Removed "prog-burst-len", "had-gmac", has-pmt" properties.
>   They are now implicitly set for "st,spear600-gmac" compatible
>   devices.
> - Removed phy-addr
> - Used "if (pdev->dev.of_node)" to distinguish between DT
>   and non-DT version instead of #ifdef
> 
>  Documentation/devicetree/bindings/net/stmmac.txt   |   28 ++++++++
>  .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |   76 +++++++++++++++++++-
>  2 files changed, 102 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/net/stmmac.txt
> 
> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
> new file mode 100644
> index 0000000..a91f4e1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
> @@ -0,0 +1,28 @@
> +* STMicroelectronics 10/100/1000 Ethernet driver (GMAC)
> +
> +Required properties:
> +- compatible: Should be "st,spear600-gmac"
> +- reg: Address and length of the register set for the device
> +- interrupt-parent: Should be the phandle for the interrupt controller
> +  that services interrupts for this device
> +- interrupts: Should contain the STMMAC interrupts
> +- interrupt-names: Should contain the interrupt names "macirq"
> +  "eth_wake_irq" if this interrupt is supported in the "interrupts"
> +  property
> +- phy-mode: String, operation mode of the PHY interface.
> +  Supported values are: "mii", "rmii", "gmii", "rgmii".
> +
> +Optional properties:
> +- mac-address: 6 bytes, mac address
> +
> +Examples:
> +
> +	gmac0: stmmac@...00000 {

Use generic names: gmac0: ethernet@...00000

> +		compatible = "st,spear600-gmac";
> +		reg = <0xe0800000 0x8000>;
> +		interrupt-parent = <&vic1>;
> +		interrupts = <24 23>;
> +		interrupt-names = "macirq", "eth_wake_irq";
> +		mac-address = [000000000000]; /* Filled in by U-Boot */
> +		phy-mode = "gmii";
> +	};
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 3aad981..ed8b477 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -24,8 +24,50 @@
>  
>  #include <linux/platform_device.h>
>  #include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_net.h>
>  #include "stmmac.h"
>  
> +#ifdef CONFIG_OF
> +static int __devinit stmmac_probe_config_dt(struct platform_device *pdev,
> +					    struct plat_stmmacenet_data *plat,
> +					    const char **mac)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +
> +	if (!np)
> +		return -ENODEV;
> +
> +	*mac = of_get_mac_address(np);
> +
> +	plat->interface = of_get_phy_mode(np);
> +	of_property_read_u32(np, "phy-addr", &plat->phy_addr);

This property doesn't exist anymore.


> +	plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
> +					   sizeof(struct stmmac_mdio_bus_data),
> +					   GFP_KERNEL);
> +
> +	/*
> +	 * Currently only the properties needed on SPEAr600
> +	 * are provided. All other properties should be added
> +	 * once needed on other platforms.
> +	 */
> +        if (of_device_is_compatible(np, "st,spear600-gmac")) {

indent is using spaces.

> +		plat->pbl = 8;
> +		plat->has_gmac = 1;
> +		plat->pmt = 1;
> +	}
> +
> +	return 0;
> +}
> +#else
> +static int __devinit stmmac_probe_config_dt(struct platform_device *pdev,
> +					    struct plat_stmmacenet_data *plat,
> +					    const char **mac)
> +{
> +	return ERR_PTR(-ENOSYS);
> +}
> +#endif /* CONFIG_OF */
> +
>  /**
>   * stmmac_pltfr_probe
>   * @pdev: platform device pointer
> @@ -39,7 +81,8 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
>  	struct resource *res;
>  	void __iomem *addr = NULL;
>  	struct stmmac_priv *priv = NULL;
> -	struct plat_stmmacenet_data *plat_dat;
> +	struct plat_stmmacenet_data *plat_dat = NULL;
> +	const char *mac = NULL;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (!res)
> @@ -58,7 +101,25 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
>  		ret = -ENOMEM;
>  		goto out_release_region;
>  	}
> -	plat_dat = pdev->dev.platform_data;
> +
> +	if (pdev->dev.of_node) {
> +		plat_dat = devm_kzalloc(&pdev->dev,
> +					sizeof(struct plat_stmmacenet_data),
> +					GFP_KERNEL);
> +		if (!plat_dat) {
> +			pr_err("%s: ERROR: no memory", __func__);
> +			ret = -ENOMEM;
> +			goto out_unmap;
> +		}
> +
> +		ret = stmmac_probe_config_dt(pdev, plat_dat, &mac);
> +		if (ret) {
> +			pr_err("%s: main dt probe failed", __func__);
> +			goto out_unmap;
> +		}
> +	} else {
> +		plat_dat = pdev->dev.platform_data;
> +	}
>  
>  	/* Custom initialisation (if needed)*/
>  	if (plat_dat->init) {
> @@ -73,6 +134,10 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
>  		goto out_unmap;
>  	}
>  
> +	/* Get MAC address if available (DT) */
> +	if (mac)
> +		memcpy(priv->dev->dev_addr, mac, ETH_ALEN);
> +
>  	/* Get the MAC information */
>  	priv->dev->irq = platform_get_irq_byname(pdev, "macirq");
>  	if (priv->dev->irq == -ENXIO) {
> @@ -178,6 +243,12 @@ static const struct dev_pm_ops stmmac_pltfr_pm_ops = {
>  static const struct dev_pm_ops stmmac_pltfr_pm_ops;
>  #endif /* CONFIG_PM */
>  
> +static const struct of_device_id stmmac_dt_ids[] = {
> +	{ .compatible = "st,spear600-gmac", },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, stmmac_dt_ids);
> +
>  static struct platform_driver stmmac_driver = {
>  	.probe = stmmac_pltfr_probe,
>  	.remove = stmmac_pltfr_remove,
> @@ -185,6 +256,7 @@ static struct platform_driver stmmac_driver = {
>  		   .name = STMMAC_RESOURCE_NAME,
>  		   .owner = THIS_MODULE,
>  		   .pm = &stmmac_pltfr_pm_ops,
> +		   .of_match_table = of_match_ptr(stmmac_dt_ids),
>  		   },
>  };
>  

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