linux-kernel - Re: [PATCH 5/8] arm64: dts: allwinner: add R

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Date:   Fri, 10 Feb 2017 09:07:06 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.xyz>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 5/8] arm64: dts: allwinner: add R_PIO node

On Wed, Feb 08, 2017 at 07:08:46PM +0800, Icenowy Zheng wrote:
> 08.02.2017, 18:15, "Maxime Ripard" <maxime.ripard@...e-electrons.com>:
> > On Wed, Feb 08, 2017 at 06:00:06PM +0800, Icenowy Zheng wrote:
> >>  Allwinner A64 SoC has a R_PIO node like the one in H3.
> >>
> >>  Add the node as well as needed clocks and resets.
> >>
> >>  As there's no document for apb0_gates, I only added the R_PIO bit here.
> >>
> >>  Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
> >>  ---
> >>   arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 40 +++++++++++++++++++++++++++
> >>   1 file changed, 40 insertions(+)
> >>
> >>  diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> >>  index 1c64ea2d23f9..4b0baa79554c 100644
> >>  --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> >>  +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> >>  @@ -98,6 +98,15 @@
> >>                   clock-output-names = "osc32k";
> >>           };
> >>
> >>  + apb0: apb0_clk {
> >>  + compatible = "fixed-factor-clock";
> >>  + #clock-cells = <0>;
> >>  + clock-div = <1>;
> >>  + clock-mult = <1>;
> >>  + clocks = <&osc24M>;
> >>  + clock-output-names = "apb0";
> >>  + };
> >>  +
> >>           psci {
> >>                   compatible = "arm,psci-0.2";
> >>                   method = "smc";
> >>  @@ -392,5 +401,36 @@
> >>                           interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>,
> >>                                        <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
> >>                   };
> >>  +
> >>  + apb0_gates: clk@...1428 {
> >>  + compatible = "allwinner,sun50i-a64-apb0-gates-clk",
> >>  + "allwinner,sun4i-a10-gates-clk";
> >>  + reg = <0x01f01428 0x4>;
> >>  + #clock-cells = <1>;
> >>  + clocks = <&apb0>;
> >>  + clock-indices = <0>;
> >>  + clock-output-names = "apb0_pio";
> >>  + };
> >>  +
> >>  + apb0_rst: reset@...14b0 {
> >>  + reg = <0x01f014b0 0x4>;
> >>  + compatible = "allwinner,sun6i-a31-clock-reset";
> >>  + #reset-cells = <1>;
> >>  + };
> >
> > Please make a sunxi-ng driver for those clocks.
> 
> We have no enough materials to make such a CCU driver.
> 
> Clocks in CPUs are usually undocumented, and difficult to
> be collected -- even the clk-sun50iw1.c in BSP do not have
> all clocks in CPUs.

That's unfortunate, but we can deal with that by simply extending the
clocks we have. Nothing too complicated or unconvenient to deal with.

> We should only make it sunxi-ng until it's fully discovered (all
> functions in CPUs are functional).

No, I expect that by 4.12 we have converted every users to sunxi-ng,
PRCM included.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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