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can: c_can: Add device tree support to Bosch C_CAN/D_CAN controller

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Add device tree support to C_CAN/D_CAN controller and usage details
are added to device tree documentation. Driver was tested on AM335x
EVM.

Signed-off-by: AnilKumar Ch <anilkumar@ti.com>
For the of binding doc:
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
AnilKumar Ch 2012-08-02 18:43:10 +05:30 committed by Marc Kleine-Budde
parent f27b1db95d
commit 2469627d17
2 changed files with 87 additions and 17 deletions
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49
Documentation/devicetree/bindings/net/can/c_can.txt Normal file
View File

@ -0,0 +1,49 @@
Bosch C_CAN/D_CAN controller Device Tree Bindings
-------------------------------------------------
Required properties:
- compatible : Should be "bosch,c_can" for C_CAN controllers and
"bosch,d_can" for D_CAN controllers.
- reg : physical base address and size of the C_CAN/D_CAN
registers map
- interrupts : property with a value describing the interrupt
number
Optional properties:
- ti,hwmods : Must be "d_can<n>" or "c_can<n>", n being the
instance number
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.
Example:
Step1: SoC common .dtsi file
dcan1: d_can@481d0000 {
compatible = "bosch,d_can";
reg = <0x481d0000 0x2000>;
interrupts = <55>;
interrupt-parent = <&intc>;
status = "disabled";
};
(or)
dcan1: d_can@481d0000 {
compatible = "bosch,d_can";
ti,hwmods = "d_can1";
reg = <0x481d0000 0x2000>;
interrupts = <55>;
interrupt-parent = <&intc>;
status = "disabled";
};
Step 2: board specific .dts file
&dcan1 {
status = "okay";
};

55
drivers/net/can/c_can/c_can_platform.c
View File

@ -30,6 +30,8 @@
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/can/dev.h>
@ -65,17 +67,52 @@ static void c_can_plat_write_reg_aligned_to_32bit(struct c_can_priv *priv,
writew(val, priv->base + 2 * priv->regs[index]);
}
static struct platform_device_id c_can_id_table[] = {
[BOSCH_C_CAN_PLATFORM] = {
.name = KBUILD_MODNAME,
.driver_data = BOSCH_C_CAN,
},
[BOSCH_C_CAN] = {
.name = "c_can",
.driver_data = BOSCH_C_CAN,
},
[BOSCH_D_CAN] = {
.name = "d_can",
.driver_data = BOSCH_D_CAN,
}, {
}
};
static const struct of_device_id c_can_of_table[] = {
{ .compatible = "bosch,c_can", .data = &c_can_id_table[BOSCH_C_CAN] },
{ .compatible = "bosch,d_can", .data = &c_can_id_table[BOSCH_D_CAN] },
{ /* sentinel */ },
};
static int __devinit c_can_plat_probe(struct platform_device *pdev)
{
int ret;
void __iomem *addr;
struct net_device *dev;
struct c_can_priv *priv;
const struct of_device_id *match;
const struct platform_device_id *id;
struct resource *mem;
int irq;
struct clk *clk;
if (pdev->dev.of_node) {
match = of_match_device(c_can_of_table, &pdev->dev);
if (!match) {
dev_err(&pdev->dev, "Failed to find matching dt id\n");
ret = -EINVAL;
goto exit;
}
id = match->data;
} else {
id = platform_get_device_id(pdev);
}
/* get the appropriate clk */
clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
@ -114,7 +151,6 @@ static int __devinit c_can_plat_probe(struct platform_device *pdev)
}
priv = netdev_priv(dev);
id = platform_get_device_id(pdev);
switch (id->driver_data) {
case BOSCH_C_CAN:
priv->regs = reg_map_c_can;
@ -195,26 +231,11 @@ static int __devexit c_can_plat_remove(struct platform_device *pdev)
return 0;
}
static const struct platform_device_id c_can_id_table[] = {
[BOSCH_C_CAN_PLATFORM] = {
.name = KBUILD_MODNAME,
.driver_data = BOSCH_C_CAN,
},
[BOSCH_C_CAN] = {
.name = "c_can",
.driver_data = BOSCH_C_CAN,
},
[BOSCH_D_CAN] = {
.name = "d_can",
.driver_data = BOSCH_D_CAN,
}, {
}
};
static struct platform_driver c_can_plat_driver = {
.driver = {
.name = KBUILD_MODNAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(c_can_of_table),
},
.probe = c_can_plat_probe,
.remove = __devexit_p(c_can_plat_remove),