Messages in this thread | | | Date | Tue, 24 Nov 2015 18:27:09 +0800 | From | Jisheng Zhang <> | Subject | Re: [PATCH v3 4/5] ARM: dts: sun9i: Add A80 PRCM clocks and reset control nodes |
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+ Sebastian
On Tue, 24 Nov 2015 17:32:15 +0800 Chen-Yu Tsai wrote:
> This adds the supported PRCM clocks and reset controls to the A80 dtsi. > The DAUDIO module clocks are not supported yet. > > Also update clock and reset phandles for r_uart. > > Signed-off-by: Chen-Yu Tsai <wens@csie.org> > --- > arch/arm/boot/dts/sun9i-a80.dtsi | 79 +++++++++++++++++++++++++++++++++++++++- > 1 file changed, 78 insertions(+), 1 deletion(-) > > diff --git a/arch/arm/boot/dts/sun9i-a80.dtsi b/arch/arm/boot/dts/sun9i-a80.dtsi > index 1118bf5cc4fb..a4ce348c0831 100644 > --- a/arch/arm/boot/dts/sun9i-a80.dtsi > +++ b/arch/arm/boot/dts/sun9i-a80.dtsi > @@ -164,6 +164,14 @@ > "usb_phy2", "usb_hsic_12M"; > }; > > + pll3: clk@06000008 { > + /* placeholder until implemented */ > + #clock-cells = <0>; > + compatible = "fixed-clock"; > + clock-rate = <0>; > + clock-output-names = "pll3"; > + }; > + > pll4: clk@0600000c { > #clock-cells = <0>; > compatible = "allwinner,sun9i-a80-pll4-clk"; > @@ -350,6 +358,68 @@ > "apb1_uart2", "apb1_uart3", > "apb1_uart4", "apb1_uart5"; > }; > + > + cpus_clk: clk@08001410 { > + compatible = "allwinner,sun9i-a80-cpus-clk"; > + reg = <0x08001410 0x4>; > + #clock-cells = <0>; > + clocks = <&osc32k>, <&osc24M>, <&pll4>, <&pll3>; > + clock-output-names = "cpus"; > + }; > + > + ahbs: ahbs_clk { > + compatible = "fixed-factor-clock"; > + #clock-cells = <0>; > + clock-div = <1>; > + clock-mult = <1>; > + clocks = <&cpus_clk>; > + clock-output-names = "ahbs"; > + };
Dear Sebastian and all,
I just want to take the sunxi clk support in mainline for example.
I'm not sure I understand correctly, it seems to me that some maintainers draw a line: "having a node for every clock" is a no, no[1]. But here we saw one node for cpus_clk and apbs below. And <0x08001410 0x4>; <0x0800141c 0x4>; shows they are close each other, so should we merge them into a single clock complex node then use mfd, regmap in clk driver?
But IMHO, sunxi dts nodes really represent real HW, so I still can't understand why we could not have each node for cpus_clk and apbs. Can you please kindly teach me?
Another question: is "Not having a node for every clock" a rule, Would you please confirm? if yes, I'll strictly follow this rule.
[1]http://lists.infradead.org/pipermail/linux-arm-kernel/2015-November/387335.html
Thank you very much, Jisheng
> + > + apbs: clk@0800141c { > + compatible = "allwinner,sun8i-a23-apb0-clk"; > + reg = <0x0800141c 0x4>; > + #clock-cells = <0>; > + clocks = <&ahbs>; > + clock-output-names = "apbs"; > + }; > + > + apbs_gates: clk@08001428 { > + compatible = "allwinner,sun9i-a80-apbs-gates-clk"; > + reg = <0x08001428 0x4>; > + #clock-cells = <1>; > + clocks = <&apbs>; > + clock-indices = <0>, <1>, > + <2>, <3>, > + <4>, <5>, > + <6>, <7>, > + <12>, <13>, > + <16>, <17>, > + <18>, <20>; > + clock-output-names = "apbs_pio", "apbs_ir", > + "apbs_timer", "apbs_rsb", > + "apbs_uart", "apbs_1wire", > + "apbs_i2c0", "apbs_i2c1", > + "apbs_ps2_0", "apbs_ps2_1", > + "apbs_dma", "apbs_i2s0", > + "apbs_i2s1", "apbs_twd"; > + };
This is for gate clocks, so we have a node for gateclks. gateclks are merged into one node.
> + > + r_1wire_clk: clk@08001450 { > + reg = <0x08001450 0x4>; > + #clock-cells = <0>; > + compatible = "allwinner,sun4i-a10-mod0-clk"; > + clocks = <&osc32k>, <&osc24M>; > + clock-output-names = "r_1wire"; > + }; > + > + r_ir_clk: clk@08001454 { > + reg = <0x08001454 0x4>; > + #clock-cells = <0>; > + compatible = "allwinner,sun4i-a10-mod0-clk"; > + clocks = <&osc32k>, <&osc24M>; > + clock-output-names = "r_ir"; > + }; > }; > > soc { > @@ -764,13 +834,20 @@ > interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>; > }; > > + apbs_rst: reset@080014b0 { > + reg = <0x080014b0 0x4>; > + compatible = "allwinner,sun6i-a31-clock-reset"; > + #reset-cells = <1>; > + }; > + > r_uart: serial@08002800 { > compatible = "snps,dw-apb-uart"; > reg = <0x08002800 0x400>; > interrupts = <GIC_SPI 38 IRQ_TYPE_LEVEL_HIGH>; > reg-shift = <2>; > reg-io-width = <4>; > - clocks = <&osc24M>; > + clocks = <&apbs_gates 4>; > + resets = <&apbs_rst 4>; > status = "disabled"; > }; > };
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