On Mon, Feb 16, 2015 at 10:20:10AM +0100, Geert Uytterhoeven wrote:
> Hi Kaneko-san, Mizuguchi-san,
>
> On Sun, Feb 15, 2015 at 3:49 PM, Yoshihiro Kaneko <ykaneko0929@xxxxxxxxx> wrote:
> > From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@xxxxxxxxxxx>
> >
> > HSUSB uses hp_clk for H/W register access.
>
> That indeed seems to be true, and that's what this patch is changing.
>
> > HSUSB uses mp_clk for USB-DMAC access.
>
> However, page 64-2 doesn't mention the MP clock for USB-DMAC:
> "AXI bus clock (ZSφ: 260 MHz), HPB bus clock (HPφ: 130 MHz).
> USB local bus clock (48 MHz)"
> So your statement doesn't seem to be true?
Thanks, I see that too.
> Note that mstp3_clks in dtsi has hp_clk as the parent for both usbdmac0 and
> usbdmac1, so if your statement would be true, that has to changed, too?
>
> The same is true for other members of the R-Car Gen2 family, e.g. your patch
> for r8a7791.
It seems to me that we could:
1. Apply this patch with the changelog updated and;
2. Follow up on the DMAC clocks
Does that sound reasonable to you?
> > The clock is defined for H/W register access.
> >
> > Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@xxxxxxxxxxx>
> > Signed-off-by: Yoshihiro Kaneko <ykaneko0929@xxxxxxxxx>
> > ---
> >
> > This patch is based on devel branch of Simon Horman's renesas tree.
> >
> > arch/arm/boot/dts/r8a7790.dtsi | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm/boot/dts/r8a7790.dtsi b/arch/arm/boot/dts/r8a7790.dtsi
> > index 24de994..113edf2 100644
> > --- a/arch/arm/boot/dts/r8a7790.dtsi
> > +++ b/arch/arm/boot/dts/r8a7790.dtsi
>
> > @@ -1132,7 +1133,7 @@
> > mstp7_clks: mstp7_clks@e615014c {
> > compatible = "renesas,r8a7790-mstp-clocks", "renesas,cpg-mstp-clocks";
> > reg = <0 0xe615014c 0 4>, <0 0xe61501c4 0 4>;
> > - clocks = <&mp_clk>, <&mp_clk>, <&zs_clk>, <&zs_clk>, <&p_clk>,
> > + clocks = <&mp_clk>, <&hp_clk>, <&zs_clk>, <&zs_clk>, <&p_clk>,
> > <&p_clk>, <&zx_clk>, <&zx_clk>, <&zx_clk>, <&zx_clk>,
> > <&zx_clk>;
> > #clock-cells = <1>;
>
> 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
>
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