Hi Simon,
On Thu, Jan 21, 2016 at 6:09 AM, Simon Horman
<horms+renesas@xxxxxxxxxxxx> wrote:
> 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.
>
> Based on work by Sergei Shtylyov for the r8a7791 SoC.
>
> Cc: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
> ---
> arch/arm/boot/dts/r8a7793.dtsi | 20 +++++++++++++++++++-
> 1 file changed, 19 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/r8a7793.dtsi b/arch/arm/boot/dts/r8a7793.dtsi
> index 0ce7cc420c9d..5d9375fa6759 100644
> --- a/arch/arm/boot/dts/r8a7793.dtsi
> +++ b/arch/arm/boot/dts/r8a7793.dtsi
> @@ -706,12 +706,30 @@
> clock-output-names = "extal";
> };
>
> + /* 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,r8a7793-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",
To create the "rcan" clock, it should be listed in clock-output-names.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
