On 木, 1月 21, 2016 at 09:38:21午前 +0100, Geert Uytterhoeven wrote:
> 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.
Thanks, sorry for missing that.
