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ARM: shmobile: r8a7790: add CAN clocks

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The R-Car CAN controllers can derive the CAN bus clock not only from their
peripheral clock input (clkp1) but also from the other internal clock (clkp2)
and external clock fed on CAN_CLK pin.  Describe those clocks in the device
tree,  along with  the USB_EXTAL clock  from which clkp2 is derived.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Sergei Shtylyov 2015-01-06 00:33:25 +03:00 committed by Simon Horman
parent 4a5fcc685a
commit 41650f406c
2 changed files with 21 additions and 2 deletions
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22
arch/arm/boot/dts/r8a7790.dtsi
View file

@ -838,16 +838,34 @@ audio_clk_c: audio_clk_c {
clock-output-names = "audio_clk_c";
};
/* External USB clock - can be overridden by the board */
usb_extal_clk: usb_extal_clk {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <48000000>;
clock-output-names = "usb_extal";
};
/* External CAN clock */
can_clk: can_clk {
compatible = "fixed-clock";
#clock-cells = <0>;
/* This value must be overridden by the board. */
clock-frequency = <0>;
clock-output-names = "can_clk";
status = "disabled";
};
/* Special CPG clocks */
cpg_clocks: cpg_clocks@e6150000 {
compatible = "renesas,r8a7790-cpg-clocks",
"renesas,rcar-gen2-cpg-clocks";
reg = <0 0xe6150000 0 0x1000>;
clocks = <&extal_clk>;
clocks = <&extal_clk &usb_extal_clk>;
#clock-cells = <1>;
clock-output-names = "main", "pll0", "pll1", "pll3",
"lb", "qspi", "sdh", "sd0", "sd1",
"z";
"z", "rcan";
};
/* Variable factor clocks */

1
include/dt-bindings/clock/r8a7790-clock.h
View file

@ -21,6 +21,7 @@
#define R8A7790_CLK_SD0 7
#define R8A7790_CLK_SD1 8
#define R8A7790_CLK_Z 9
#define R8A7790_CLK_RCAN 10
/* MSTP0 */
#define R8A7790_CLK_MSIOF0 0