Messages in this thread | | | Subject | Re: [PATCH] clk: stm32h7: Add stm32h743 clock driver | From | Gabriel Fernandez <> | Date | Fri, 28 Apr 2017 16:56:16 +0200 |
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Hi Stephen
Sorry for delay i was on sick live
On 04/07/2017 09:51 PM, Stephen Boyd wrote: > On 04/06, Gabriel Fernandez wrote: >> On 04/06/2017 12:32 AM, Stephen Boyd wrote: >>> On 03/15, gabriel.fernandez@st.com wrote: >>>> diff --git a/Documentation/devicetree/bindings/clock/st,stm32h7-rcc.txt b/Documentation/devicetree/bindings/clock/st,stm32h7-rcc.txt >>>> new file mode 100644 >>>> index 0000000..9d4b587 >>>> --- /dev/null >>>> +++ b/Documentation/devicetree/bindings/clock/st,stm32h7-rcc.txt >>>> @@ -0,0 +1,152 @@ >>>> + >>>> + rcc: rcc@58024400 { >>>> + #reset-cells = <1>; >>>> + #clock-cells = <2> >>>> + compatible = "st,stm32h743-rcc", "st,stm32-rcc"; >>>> + reg = <0x58024400 0x400>; >>>> + clocks = <&clk_hse>, <&clk_lse>, <&clk_i2s_ckin>; >>>> + >>>> + st,syscfg = <&pwrcfg>; >>>> + >>>> + #address-cells = <1>; >>>> + #size-cells = <0>; >>>> + >>>> + vco1@58024430 { >>>> + #clock-cells = <0>; >>>> + compatible = "stm32,pll"; >>>> + reg = <0>; >>> reg is super confusing and doesn't match unit address. >> ok i fixed it in the v2 >> >>>> + }; >>> Why? Shouldn't we know this from the compatible string how many >>> PLLs there are and where they're located? Export the PLLs through >>> rcc node's clock-cells? >>> >> Because i need to offer the possibility to change the PLL VCO >> frequencies at the start-up of this driver clock. >> The VCO algorithm needs a division factor, a multiplication factor >> and a fractional factor. >> Lot's of solution are possible for one frequency and it's nightmare >> to satisfy the 3 output dividers of the PLL. > Sure, but do we need to configure that on a per-board basis or a > per-SoC basis? If it's just some configuration, I wonder why we > don't put that into the driver and base it off some compatible > string that includes the SoC the device is for. > I prefer to let in first, the responsibility of the boot loader to change VCO parameters. Then i propose a new version without DT configuration of PLL's are you ok for that ?
best regards
Gabriel
To simply
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