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Message-Id: <201407020227.04235.sergei.shtylyov@cogentembedded.com>
Date: Wed, 2 Jul 2014 02:27:03 +0400
From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To: netdev@...r.kernel.org, wg@...ndegger.com, mkl@...gutronix.de,
linux-can@...r.kernel.org, robh+dt@...nel.org, pawel.moll@....com,
mark.rutland@....com, ijc+devicetree@...lion.org.uk,
galak@...eaurora.org, grant.likely@...aro.org,
devicetree@...r.kernel.org
Cc: linux-sh@...r.kernel.org, vksavl@...il.com, rdunlap@...radead.org,
linux-doc@...r.kernel.org
Subject: [PATCH] rcar_can: add device tree support
Add support of the device tree probing for the Renesas R-Car CAN controllers
documenting the device tree bindings as necessary.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
---
The patch is against the Dave Miller's 'net-next.git' repo ('linux-can-next.git'
repo still doesn't have the R-Car CAN driver for some reason).
Documentation/devicetree/bindings/net/can/rcar_can.txt | 40 +++++++++++++++++
drivers/net/can/rcar_can.c | 28 +++++++++--
2 files changed, 63 insertions(+), 5 deletions(-)
Index: net-next/Documentation/devicetree/bindings/net/can/rcar_can.txt
===================================================================
--- /dev/null
+++ net-next/Documentation/devicetree/bindings/net/can/rcar_can.txt
@@ -0,0 +1,40 @@
+Renesas R-Car CAN controller Device Tree Bindings
+-------------------------------------------------
+
+Required properties:
+- compatible: "renesas,can-r8a7778" if CAN controller is a part of R8A7778 SoC.
+ "renesas,can-r8a7779" if CAN controller is a part of R8A7779 SoC.
+ "renesas,can-r8a7790" if CAN controller is a part of R8A7790 SoC.
+ "renesas,can-r8a7791" if CAN controller is a part of R8A7791 SoC.
+- reg: physical base address and size of the R-Car CAN register map.
+- interrupts: interrupt specifier for the sole interrupt.
+- clocks: phandle and clock specifier for the R-Car CAN clock input.
+- pinctrl-0: pin control group to be used for this controller.
+- pinctrl-names: must be "default".
+
+Optional properties:
+- clock-select: R-Car CAN Clock Source Select. Valid values are:
+ <0x0> (default) : Peripheral clock (clkp1)
+ <0x1> : Peripheral clock (clkp2)
+ <0x3> : Externally input clock
+
+Example
+-------
+
+SoC common .dtsi file:
+
+ can0: can@...80000 {
+ compatible = "renesas,can-r8a7791";
+ reg = <0 0xe6e80000 0 0x1000>;
+ interrupts = <0 186 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&mstp9_clks R8A7791_CLK_RCAN0>;
+ status = "disabled";
+ };
+
+Board specific .dts file:
+
+&can0 {
+ pinctrl-0 = <&can0_pins>;
+ pinctrl-names = "default";
+ status = "okay";
+};
Index: net-next/drivers/net/can/rcar_can.c
===================================================================
--- net-next.orig/drivers/net/can/rcar_can.c
+++ net-next/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"
@@ -722,13 +723,20 @@ static int rcar_can_probe(struct platfor
struct net_device *ndev;
struct resource *mem;
void __iomem *addr;
+ u32 clock_select = 0;
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) {
+ pdata = dev_get_platdata(&pdev->dev);
+ if (!pdata) {
+ dev_err(&pdev->dev, "No platform data provided!\n");
+ goto fail;
+ }
+ clock_select = pdata->clock_select;
+ } else {
+ of_property_read_u32(pdev->dev.of_node, "clock-select",
+ &clock_select);
}
irq = platform_get_irq(pdev, 0);
@@ -765,7 +773,7 @@ static int rcar_can_probe(struct platfor
ndev->flags |= IFF_ECHO;
priv->ndev = ndev;
priv->regs = addr;
- priv->clock_select = pdata->clock_select;
+ priv->clock_select = clock_select;
priv->can.clock.freq = clk_get_rate(priv->clk);
priv->can.bittiming_const = &rcar_can_bittiming_const;
priv->can.do_set_mode = rcar_can_do_set_mode;
@@ -858,10 +866,20 @@ static int __maybe_unused rcar_can_resum
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,
--
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