Add CAN-Bus

Change-Id: Ied8dc39adf43fea110b3e7236d91eba60b267254
Reviewed-on: https://tp-biosrd-v02/gerrit/82150
Reviewed-by: Scorpio Chang(張志賢) <Scorpio_Chang@asus.com>
Tested-by: Scorpio Chang(張志賢) <Scorpio_Chang@asus.com>

Author: yc-hou-0919

arch/arm/boot/dts/overlays/Makefile

@@ -19,6 +19,8 @@ dtbo-$(CONFIG_ARCH_ROCKCHIP) += \
 	ds1307.dtbo \
 	lirc-rpi.dtbo \
 	lirc-toshiba.dtbo \
+	mcp2515-can0.dtbo \
+
 
 targets += dtbs dtbs_install
 targets += $(dtbo-y)

arch/arm/boot/dts/overlays/mcp2515-can0-overlay.dts

@@ -0,0 +1,71 @@
+/*
+ * Device tree overlay for mcp251x/can0 on spi0.0
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+    compatible = "rockchip,rk3288-miniarm", "rockchip,rk3288";
+    /* disable spi-dev for spi0.0 */
+    fragment@0 {
+        target = <&spi2>;
+        __overlay__ {
+            status = "okay";
+            spidev@0{
+                status = "disabled";
+            };
+            spidev@1{
+                status = "disabled";
+            };
+        };
+    };
+
+    /* the interrupt pin of the can-controller */
+    fragment@1 {
+        target = <&gpio5>;
+        __overlay__ {
+            can0_pins: can0_pins {
+		rockchip,pins = <5 19 0 &pcfg_pull_none>;
+            };
+        };
+    };
+
+    /* the clock/oscillator of the can-controller */
+    fragment@2 {
+        target-path = "/";
+        __overlay__ {
+            /* external oscillator of mcp2515 on SPI0.0 */
+            can0_osc: can0_osc {
+                compatible = "fixed-clock";
+                #clock-cells = <0>;
+                clock-frequency  = <16000000>;
+            };
+        };
+    };
+
+    /* the spi config of the can-controller itself binding everything together */
+    fragment@3 {
+        target = <&spi2>;
+        __overlay__ {
+            /* needed to avoid dtc warning */
+            #address-cells = <2>;
+            #size-cells = <0>;
+            can0: mcp2515@0 {
+                reg = <0>;
+                compatible = "microchip,mcp2515";
+                pinctrl-names = "default";
+                pinctrl-0 = <&can0_pins>;
+                spi-max-frequency = <10000000>;
+                interrupt-parent = <&gpio5>;
+                interrupts = <19 0x2>;
+                clocks = <&can0_osc>;
+            };
+        };
+    };
+    //__overrides__ {
+    //    oscillator = <&can0_osc>,"clock-frequency:0";
+    //    spimaxfrequency = <&can0>,"spi-max-frequency:0";
+    //    interrupt = <&can0_pins>,"brcm,pins:0",<&can0>,"interrupts:0";
+    //};
+};

arch/arm/configs/miniarm-rk3288_defconfig

@@ -823,3 +823,6 @@ CONFIG_TASKSTATS=y
 CONFIG_TASK_DELAY_ACCT=y
 CONFIG_TASK_XACCT=y
 CONFIG_TASK_IO_ACCOUNTING=y
+CONFIG_CAN=y
+CONFIG_CAN_DEV=y
+CONFIG_CAN_MCP251X=y