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ARM: shmobile: r8a7791: 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 01:24:08 +03:00 committed by Simon Horman
parent 6a7742b4ee
commit b324252cc1
2 changed files with 22 additions and 2 deletions
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23
arch/arm/boot/dts/r8a7791.dtsi
View File

@ -862,15 +862,34 @@
status = "disabled";
};
/* 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,r8a7791-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", "z";
"lb", "qspi", "sdh", "sd0", "z",
"rcan";
};
/* Variable factor clocks */

1
include/dt-bindings/clock/r8a7791-clock.h
View File

@ -20,6 +20,7 @@
#define R8A7791_CLK_SDH 6
#define R8A7791_CLK_SD0 7
#define R8A7791_CLK_Z 8
#define R8A7791_CLK_RCAN 9
/* MSTP0 */
#define R8A7791_CLK_MSIOF0 0