can: rcar_can: add device tree support

Add support of the device tree probing for the Renesas R-Car CAN controllers.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/rcar_can.c b/drivers/net/can/rcar_can.c
index c02fcf3..1abe133 100644 (file)
--- a/drivers/net/can/rcar_can.c
+++ b/drivers/net/can/rcar_can.c
@@ -20,6 +20,7 @@
 #include <linux/can/dev.h>
 #include <linux/clk.h>
 #include <linux/can/platform/rcar_can.h>
+#include <linux/of.h>
 
 #define RCAR_CAN_DRV_NAME      "rcar_can"
 
@@ -738,16 +739,21 @@ static int rcar_can_probe(struct platform_device *pdev)
        struct net_device *ndev;
        struct resource *mem;
        void __iomem *addr;
-       u32 clock_select;
+       u32 clock_select = CLKR_CLKP1;
        int err = -ENODEV;
        int irq;
 
-       pdata = dev_get_platdata(&pdev->dev);
-       if (!pdata) {
-               dev_err(&pdev->dev, "No platform data provided!\n");
-               goto fail;
+       if (pdev->dev.of_node) {
+               of_property_read_u32(pdev->dev.of_node,
+                                    "renesas,can-clock-select", &clock_select);
+       } else {
+               pdata = dev_get_platdata(&pdev->dev);
+               if (!pdata) {
+                       dev_err(&pdev->dev, "No platform data provided!\n");
+                       goto fail;
+               }
+               clock_select = pdata->clock_select;
        }
-       clock_select = pdata->clock_select;
 
        irq = platform_get_irq(pdev, 0);
        if (!irq) {
@@ -888,10 +894,20 @@ static int __maybe_unused rcar_can_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(rcar_can_pm_ops, rcar_can_suspend, rcar_can_resume);
 
+static const struct of_device_id rcar_can_of_table[] __maybe_unused = {
+       { .compatible = "renesas,can-r8a7778" },
+       { .compatible = "renesas,can-r8a7779" },
+       { .compatible = "renesas,can-r8a7790" },
+       { .compatible = "renesas,can-r8a7791" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, rcar_can_of_table);
+
 static struct platform_driver rcar_can_driver = {
        .driver = {
                .name = RCAR_CAN_DRV_NAME,
                .owner = THIS_MODULE,
+               .of_match_table = of_match_ptr(rcar_can_of_table),
                .pm = &rcar_can_pm_ops,
        },
        .probe = rcar_can_probe,