提交 66606aaf 编写于 作者: A Alexander Shiyan 提交者: Marc Kleine-Budde

can: mcp251x: Add device tree support

This patch adds Device Tree support to the Microchip MCP251X driver.
Signed-off-by: NAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
上级 c0ebbdd6
* Microchip MCP251X stand-alone CAN controller device tree bindings
Required properties:
- compatible: Should be one of the following:
- "microchip,mcp2510" for MCP2510.
- "microchip,mcp2515" for MCP2515.
- reg: SPI chip select.
- clocks: The clock feeding the CAN controller.
- interrupt-parent: The parent interrupt controller.
- interrupts: Should contain IRQ line for the CAN controller.
Optional properties:
- vdd-supply: Regulator that powers the CAN controller.
- xceiver-supply: Regulator that powers the CAN transceiver.
Example:
can0: can@1 {
compatible = "microchip,mcp2515";
reg = <1>;
clocks = <&clk24m>;
interrupt-parent = <&gpio4>;
interrupts = <13 0x2>;
vdd-supply = <&reg5v0>;
xceiver-supply = <&reg5v0>;
};
......@@ -58,6 +58,7 @@
#include <linux/can/dev.h>
#include <linux/can/led.h>
#include <linux/can/platform/mcp251x.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/device.h>
......@@ -68,6 +69,8 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
......@@ -263,6 +266,7 @@ struct mcp251x_priv {
int restart_tx;
struct regulator *power;
struct regulator *transceiver;
struct clk *clk;
};
#define MCP251X_IS(_model) \
......@@ -994,22 +998,65 @@ static const struct net_device_ops mcp251x_netdev_ops = {
.ndo_start_xmit = mcp251x_hard_start_xmit,
};
static const struct of_device_id mcp251x_of_match[] = {
{
.compatible = "microchip,mcp2510",
.data = (void *)CAN_MCP251X_MCP2510,
},
{
.compatible = "microchip,mcp2515",
.data = (void *)CAN_MCP251X_MCP2515,
},
{ }
};
MODULE_DEVICE_TABLE(of, mcp251x_of_match);
static const struct spi_device_id mcp251x_id_table[] = {
{
.name = "mcp2510",
.driver_data = (kernel_ulong_t)CAN_MCP251X_MCP2510,
},
{
.name = "mcp2515",
.driver_data = (kernel_ulong_t)CAN_MCP251X_MCP2515,
},
{ }
};
MODULE_DEVICE_TABLE(spi, mcp251x_id_table);
static int mcp251x_can_probe(struct spi_device *spi)
{
const struct of_device_id *of_id = of_match_device(mcp251x_of_match,
&spi->dev);
struct mcp251x_platform_data *pdata = dev_get_platdata(&spi->dev);
struct net_device *net;
struct mcp251x_priv *priv;
struct mcp251x_platform_data *pdata = dev_get_platdata(&spi->dev);
int ret = -ENODEV;
int freq, ret = -ENODEV;
struct clk *clk;
clk = devm_clk_get(&spi->dev, NULL);
if (IS_ERR(clk)) {
if (pdata)
freq = pdata->oscillator_frequency;
else
return PTR_ERR(clk);
} else {
freq = clk_get_rate(clk);
}
if (!pdata)
/* Platform data is required for osc freq */
goto error_out;
/* Sanity check */
if (freq < 1000000 || freq > 25000000)
return -ERANGE;
/* Allocate can/net device */
net = alloc_candev(sizeof(struct mcp251x_priv), TX_ECHO_SKB_MAX);
if (!net) {
ret = -ENOMEM;
goto error_alloc;
if (!net)
return -ENOMEM;
if (!IS_ERR(clk)) {
ret = clk_prepare_enable(clk);
if (ret)
goto out_free;
}
net->netdev_ops = &mcp251x_netdev_ops;
......@@ -1018,23 +1065,27 @@ static int mcp251x_can_probe(struct spi_device *spi)
priv = netdev_priv(net);
priv->can.bittiming_const = &mcp251x_bittiming_const;
priv->can.do_set_mode = mcp251x_do_set_mode;
priv->can.clock.freq = pdata->oscillator_frequency / 2;
priv->can.clock.freq = freq / 2;
priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY;
priv->model = spi_get_device_id(spi)->driver_data;
if (of_id)
priv->model = (enum mcp251x_model)of_id->data;
else
priv->model = spi_get_device_id(spi)->driver_data;
priv->net = net;
priv->clk = clk;
priv->power = devm_regulator_get(&spi->dev, "vdd");
priv->transceiver = devm_regulator_get(&spi->dev, "xceiver");
if ((PTR_ERR(priv->power) == -EPROBE_DEFER) ||
(PTR_ERR(priv->transceiver) == -EPROBE_DEFER)) {
ret = -EPROBE_DEFER;
goto error_power;
goto out_clk;
}
ret = mcp251x_power_enable(priv->power, 1);
if (ret)
goto error_power;
goto out_clk;
spi_set_drvdata(spi, priv);
......@@ -1113,11 +1164,14 @@ static int mcp251x_can_probe(struct spi_device *spi)
dma_free_coherent(&spi->dev, PAGE_SIZE,
priv->spi_tx_buf, priv->spi_tx_dma);
mcp251x_power_enable(priv->power, 0);
error_power:
out_clk:
if (!IS_ERR(clk))
clk_disable_unprepare(clk);
out_free:
free_candev(net);
error_alloc:
dev_err(&spi->dev, "probe failed\n");
error_out:
return ret;
}
......@@ -1135,6 +1189,9 @@ static int mcp251x_can_remove(struct spi_device *spi)
mcp251x_power_enable(priv->power, 0);
if (!IS_ERR(priv->clk))
clk_disable_unprepare(priv->clk);
free_candev(net);
return 0;
......@@ -1197,21 +1254,13 @@ static int mcp251x_can_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(mcp251x_can_pm_ops, mcp251x_can_suspend,
mcp251x_can_resume);
static const struct spi_device_id mcp251x_id_table[] = {
{ "mcp2510", CAN_MCP251X_MCP2510 },
{ "mcp2515", CAN_MCP251X_MCP2515 },
{ },
};
MODULE_DEVICE_TABLE(spi, mcp251x_id_table);
static struct spi_driver mcp251x_can_driver = {
.driver = {
.name = DEVICE_NAME,
.owner = THIS_MODULE,
.of_match_table = mcp251x_of_match,
.pm = &mcp251x_can_pm_ops,
},
.id_table = mcp251x_id_table,
.probe = mcp251x_can_probe,
.remove = mcp251x_can_remove,
......
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