Commit 66606aaf authored by Alexander Shiyan's avatar Alexander Shiyan Committed by Marc Kleine-Budde
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can: mcp251x: Add device tree support 



This patch adds Device Tree support to the Microchip MCP251X driver.

Signed-off-by: default avatarAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent c0ebbdd6

Documentation/devicetree/bindings/net/can/microchip,mcp251x.txt

0 → 100644
+25 −0
Original line number Diff line number Diff line 
* 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>;

	};

drivers/net/can/mcp251x.c

+74 −25
Original line number Diff line number Diff line
@@ -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;

	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,