| Message ID | 1358835176-7197-3-git-send-email-emilio@elopez.com.ar (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Emilio, Le 22/01/2013 07:12, Emilio López a écrit : > + cpu: cpu@01c20054 { > + #clock-cells = <0>; > + compatible = "allwinner,sunxi-cpu-clk"; > + reg = <0x01c20054 0x4>; > + clocks = <&osc32k>, <&osc24M>, <&pll1>; > + }; Why do you need these three clocks here ? From what you said in patch 3, it seems like the 24M oscillator is not a direct parent, but only the pll1 and the 32k oscillator, right? Thanks, Maxime
Hi Maxime, El 30/01/13 05:24, Maxime Ripard escribió: > Hi Emilio, > > Le 22/01/2013 07:12, Emilio López a écrit : > >> + cpu: cpu@01c20054 { >> + #clock-cells = <0>; >> + compatible = "allwinner,sunxi-cpu-clk"; >> + reg = <0x01c20054 0x4>; >> + clocks = <&osc32k>, <&osc24M>, <&pll1>; >> + }; > > Why do you need these three clocks here ? From what you said in patch 3, > it seems like the 24M oscillator is not a direct parent, but only the > pll1 and the 32k oscillator, right? There are two reasons: * Hardware wise it actually is a parent, as in, it is an usable source you can choose on the mux. There is also PLL6 as an option, but it has no representation yet so I have not listed it. Quoting the linux-sunxi wiki: 0x00 = 32 KHz internal RC clock 0x01 = 24 MHz external Oscillator 0x02 = PLL1 0x03 = 200 MHz sourced from PPL6 * The example in patch 3 is simplified, you may want to switch to the 24M oscillator first. My intention was to just present the concept/idea, the actual clock handling on standby contains some more steps; see: https://github.com/linux-sunxi/linux-sunxi/blob/sunxi-3.0/arch/arm/mach-sun4i/pm/standby/standby.c#L179 Thanks for the review, Emilio
diff --git a/arch/arm/boot/dts/sunxi.dtsi b/arch/arm/boot/dts/sunxi.dtsi index 8bbc2bf..e2cef13 100644 --- a/arch/arm/boot/dts/sunxi.dtsi +++ b/arch/arm/boot/dts/sunxi.dtsi @@ -24,13 +24,56 @@ clocks { #address-cells = <1>; - #size-cells = <0>; + #size-cells = <1>; + ranges; - osc: oscillator { + osc24M: osc24M@01c20050 { #clock-cells = <0>; - compatible = "fixed-clock"; + compatible = "allwinner,sunxi-osc-clk"; + reg = <0x01c20050 0x4>; clock-frequency = <24000000>; }; + + osc32k: osc32k { + #clock-cells = <0>; + compatible = "fixed-clock"; + clock-frequency = <32768>; + }; + + pll1: pll1@01c20000 { + #clock-cells = <0>; + compatible = "allwinner,sunxi-pll1-clk"; + reg = <0x01c20000 0x4>; + clocks = <&osc24M>; + }; + + cpu: cpu@01c20054 { + #clock-cells = <0>; + compatible = "allwinner,sunxi-cpu-clk"; + reg = <0x01c20054 0x4>; + clocks = <&osc32k>, <&osc24M>, <&pll1>; + }; + + axi: axi@01c20054 { + #clock-cells = <0>; + compatible = "allwinner,sunxi-axi-clk"; + reg = <0x01c20054 0x4>; + clocks = <&cpu>; + }; + + ahb: ahb@01c20054 { + #clock-cells = <0>; + compatible = "allwinner,sunxi-ahb-clk"; + reg = <0x01c20054 0x4>; + clocks = <&axi>; + }; + + apb0: apb0@01c20054 { + #clock-cells = <0>; + compatible = "allwinner,sunxi-apb0-clk"; + reg = <0x01c20054 0x4>; + clocks = <&ahb>; + }; }; soc { @@ -44,7 +87,7 @@ compatible = "allwinner,sunxi-timer"; reg = <0x01c20c00 0x90>; interrupts = <22>; - clocks = <&osc>; + clocks = <&osc24M>; }; wdt: watchdog@01c20c90 { @@ -64,7 +107,7 @@ reg = <0x01c28000 0x400>; interrupts = <1>; reg-shift = <2>; - clock-frequency = <24000000>; + clocks = <&osc24M>; status = "disabled"; }; @@ -73,7 +116,7 @@ reg = <0x01c28400 0x400>; interrupts = <2>; reg-shift = <2>; - clock-frequency = <24000000>; + clocks = <&osc24M>; status = "disabled"; }; };
This introduces proper clock definitions on sunxi.dtsi, to be used with the new clock driver for sunxi. Signed-off-by: Emilio López <emilio@elopez.com.ar> --- arch/arm/boot/dts/sunxi.dtsi | 55 +++++++++++++++++++++++++++++++++++++++----- 1 file changed, 49 insertions(+), 6 deletions(-)