2017年3月21日 下午3:41于 Maxime Ripard <[email protected]>写道： > > On Thu, Mar 16, 2017 at 01:28:04AM +0800, Icenowy Zheng wrote: > > Many Allwinner SoCs after A31 have a CCU in PRCM block. > > > > Give the ones on H3 and A64 compatible strings. > > > > Signed-off-by: Icenowy Zheng <[email protected]> > > --- > > Changes in v2: > > - Add iosc for R_CCU's on H3/A64. (A31, A23 and A33 seem to have different > > clock for mux 3 of ar100 clk. Investgations are needed for them.) > > > > Documentation/devicetree/bindings/clock/sunxi-ccu.txt | 18 > >+++++++++++++++++- > > 1 file changed, 17 insertions(+), 1 deletion(-) > > > > diff --git a/Documentation/devicetree/bindings/clock/sunxi-ccu.txt > > b/Documentation/devicetree/bindings/clock/sunxi-ccu.txt > > index 68512aa398a9..4a4addff595d 100644 > > --- a/Documentation/devicetree/bindings/clock/sunxi-ccu.txt > > +++ b/Documentation/devicetree/bindings/clock/sunxi-ccu.txt > > @@ -7,9 +7,11 @@ Required properties : > > - "allwinner,sun8i-a23-ccu" > > - "allwinner,sun8i-a33-ccu" > > - "allwinner,sun8i-h3-ccu" > > + - "allwinner,sun8i-h3-r-ccu" > > - "allwinner,sun8i-v3s-ccu" > > - "allwinner,sun9i-a80-ccu" > > - "allwinner,sun50i-a64-ccu" > > + - "allwinner,sun50i-a64-r-ccu" > > - "allwinner,sun50i-h5-ccu" > > > > - reg: Must contain the registers base address and length > > @@ -20,7 +22,11 @@ Required properties : > > - #clock-cells : must contain 1 > > - #reset-cells : must contain 1 > > > > -Example: > > +For the PRCM CCUs on H3/A64, one more clock is needed: > > +- "iosc": another frequency oscillator used for CPUS (usually at 32000Hz, > > + not the same with losc) > > This is called the internal oscillator in the datasheet, it would > probably make more sense to call it that way in the documentation too. > > This oscillator seems to be clocked at 16MHz, so we should represent > it as such. > > And I'm wondering, are you *sure* that it's fed directly from the > internal oscillator, or goes through the registers in the RTC, with > the 32 divider and 16 prescaler by default that makes it at roughly > the same rate (31.25kHz).
BSP clock driver makes it a 32000Hz fixed clock. > > Maxime > > -- > Maxime Ripard, Free Electrons > Embedded Linux and Kernel engineering > http://free-electrons.com > > -- > You received this message because you are subscribed to the Google Groups > "linux-sunxi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
