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drivers: net: ethernet: davince_mdio: device tree implementation 

device tree implementation for davinci mdio driver

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mugunthan V N 2012-08-06 05:05:57 +00:00 committed by David S. Miller
parent aae06bf5f9
commit ec03e6a89e
2 changed files with 70 additions and 4 deletions
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33
Documentation/devicetree/bindings/net/davinci-mdio.txt Normal file
View File

@ -0,0 +1,33 @@
TI SoC Davinci MDIO Controller Device Tree Bindings
---------------------------------------------------
Required properties:
- compatible : Should be "ti,davinci_mdio"
- reg : physical base address and size of the davinci mdio
registers map
- bus_freq : Mdio Bus frequency
Optional properties:
- ti,hwmods : Must be "davinci_mdio"
Note: "ti,hwmods" field is used to fetch the base address and irq
resources from TI, omap hwmod data base during device registration.
Future plan is to migrate hwmod data base contents into device tree
blob so that, all the required data will be used from device tree dts
file.
Examples:
mdio: davinci_mdio@4A101000 {
compatible = "ti,cpsw";
reg = <0x4A101000 0x1000>;
bus_freq = <1000000>;
};
(or)
mdio: davinci_mdio@4A101000 {
compatible = "ti,cpsw";
ti,hwmods = "davinci_mdio";
bus_freq = <1000000>;
};

41
drivers/net/ethernet/ti/davinci_mdio.c
View File

@ -36,6 +36,8 @@
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/davinci_emac.h>
#include <linux/of.h>
#include <linux/of_device.h>
/*
* This timeout definition is a worst-case ultra defensive measure against
@ -289,6 +291,25 @@ static int davinci_mdio_write(struct mii_bus *bus, int phy_id,
return 0;
}
static int davinci_mdio_probe_dt(struct mdio_platform_data *data,
struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
u32 prop;
if (!node)
return -EINVAL;
if (of_property_read_u32(node, "bus_freq", &prop)) {
pr_err("Missing bus_freq property in the DT.\n");
return -EINVAL;
}
data->bus_freq = prop;
return 0;
}
static int __devinit davinci_mdio_probe(struct platform_device *pdev)
{
struct mdio_platform_data *pdata = pdev->dev.platform_data;
@ -304,8 +325,6 @@ static int __devinit davinci_mdio_probe(struct platform_device *pdev)
return -ENOMEM;
}
data->pdata = pdata ? (*pdata) : default_pdata;
data->bus = mdiobus_alloc();
if (!data->bus) {
dev_err(dev, "failed to alloc mii bus\n");
@ -313,14 +332,22 @@ static int __devinit davinci_mdio_probe(struct platform_device *pdev)
goto bail_out;
}
if (dev->of_node) {
if (davinci_mdio_probe_dt(&data->pdata, pdev))
data->pdata = default_pdata;
snprintf(data->bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
} else {
data->pdata = pdata ? (*pdata) : default_pdata;
snprintf(data->bus->id, MII_BUS_ID_SIZE, "%s-%x",
pdev->name, pdev->id);
}
data->bus->name = dev_name(dev);
data->bus->read = davinci_mdio_read,
data->bus->write = davinci_mdio_write,
data->bus->reset = davinci_mdio_reset,
data->bus->parent = dev;
data->bus->priv = data;
snprintf(data->bus->id, MII_BUS_ID_SIZE, "%s-%x",
pdev->name, pdev->id);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
@ -454,11 +481,17 @@ static const struct dev_pm_ops davinci_mdio_pm_ops = {
.resume = davinci_mdio_resume,
};
static const struct of_device_id davinci_mdio_of_mtable[] = {
{ .compatible = "ti,davinci_mdio", },
{ /* sentinel */ },
};
static struct platform_driver davinci_mdio_driver = {
.driver = {
.name = "davinci_mdio",
.owner = THIS_MODULE,
.pm = &davinci_mdio_pm_ops,
.of_match_table = of_match_ptr(davinci_mdio_of_mtable),
},
.probe = davinci_mdio_probe,
.remove = __devexit_p(davinci_mdio_remove),