can: c_can: Add device tree support to Bosch C_CAN/D_CAN controller
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
Marc Kleine-Budde
parent
f27b1db95d
commit
2469627d17
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@ -0,0 +1,49 @@
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Bosch C_CAN/D_CAN controller Device Tree Bindings
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-------------------------------------------------
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Required properties:
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- compatible : Should be "bosch,c_can" for C_CAN controllers and
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"bosch,d_can" for D_CAN controllers.
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- reg : physical base address and size of the C_CAN/D_CAN
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registers map
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- interrupts : property with a value describing the interrupt
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number
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Optional properties:
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- ti,hwmods : Must be "d_can<n>" or "c_can<n>", n being the
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instance number
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Note: "ti,hwmods" field is used to fetch the base address and irq
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resources from TI, omap hwmod data base during device registration.
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Future plan is to migrate hwmod data base contents into device tree
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blob so that, all the required data will be used from device tree dts
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file.
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Example:
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Step1: SoC common .dtsi file
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dcan1: d_can@481d0000 {
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compatible = "bosch,d_can";
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reg = <0x481d0000 0x2000>;
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interrupts = <55>;
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interrupt-parent = <&intc>;
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status = "disabled";
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};
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(or)
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dcan1: d_can@481d0000 {
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compatible = "bosch,d_can";
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ti,hwmods = "d_can1";
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reg = <0x481d0000 0x2000>;
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interrupts = <55>;
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interrupt-parent = <&intc>;
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status = "disabled";
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};
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Step 2: board specific .dts file
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&dcan1 {
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status = "okay";
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};
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@ -30,6 +30,8 @@
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/can/dev.h>
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@ -65,17 +67,52 @@ static void c_can_plat_write_reg_aligned_to_32bit(struct c_can_priv *priv,
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writew(val, priv->base + 2 * priv->regs[index]);
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}
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static struct platform_device_id c_can_id_table[] = {
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[BOSCH_C_CAN_PLATFORM] = {
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.name = KBUILD_MODNAME,
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.driver_data = BOSCH_C_CAN,
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},
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[BOSCH_C_CAN] = {
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.name = "c_can",
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.driver_data = BOSCH_C_CAN,
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},
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[BOSCH_D_CAN] = {
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.name = "d_can",
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.driver_data = BOSCH_D_CAN,
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}, {
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}
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};
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static const struct of_device_id c_can_of_table[] = {
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{ .compatible = "bosch,c_can", .data = &c_can_id_table[BOSCH_C_CAN] },
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{ .compatible = "bosch,d_can", .data = &c_can_id_table[BOSCH_D_CAN] },
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{ /* sentinel */ },
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};
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static int __devinit c_can_plat_probe(struct platform_device *pdev)
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{
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int ret;
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void __iomem *addr;
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struct net_device *dev;
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struct c_can_priv *priv;
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const struct of_device_id *match;
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const struct platform_device_id *id;
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struct resource *mem;
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int irq;
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struct clk *clk;
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if (pdev->dev.of_node) {
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match = of_match_device(c_can_of_table, &pdev->dev);
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if (!match) {
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dev_err(&pdev->dev, "Failed to find matching dt id\n");
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ret = -EINVAL;
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goto exit;
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}
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id = match->data;
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} else {
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id = platform_get_device_id(pdev);
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}
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/* get the appropriate clk */
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clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(clk)) {
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@ -114,7 +151,6 @@ static int __devinit c_can_plat_probe(struct platform_device *pdev)
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}
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priv = netdev_priv(dev);
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id = platform_get_device_id(pdev);
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switch (id->driver_data) {
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case BOSCH_C_CAN:
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priv->regs = reg_map_c_can;
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@ -195,26 +231,11 @@ static int __devexit c_can_plat_remove(struct platform_device *pdev)
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return 0;
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}
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static const struct platform_device_id c_can_id_table[] = {
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[BOSCH_C_CAN_PLATFORM] = {
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.name = KBUILD_MODNAME,
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.driver_data = BOSCH_C_CAN,
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},
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[BOSCH_C_CAN] = {
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.name = "c_can",
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.driver_data = BOSCH_C_CAN,
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},
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[BOSCH_D_CAN] = {
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.name = "d_can",
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.driver_data = BOSCH_D_CAN,
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}, {
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}
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};
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static struct platform_driver c_can_plat_driver = {
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.driver = {
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.name = KBUILD_MODNAME,
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(c_can_of_table),
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},
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.probe = c_can_plat_probe,
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.remove = __devexit_p(c_can_plat_remove),
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