linux-kernel - Re: [PATCH 10/14] ARM: dts: sun8i-a83t: Add PRCM related clocks and resets

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Date:	Mon, 15 Feb 2016 17:34:18 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Vishnu Patekar <vishnupatekar0510@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Emilio Lopez <emilio@...pez.com.ar>,
	Jens Kuske <jenskuske@...il.com>,
	Hans De Goede <hdegoede@...hat.com>,
	devicetree <devicetree@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Reinder de Haan <patchesrdh@...as.com>,
	linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH 10/14] ARM: dts: sun8i-a83t: Add PRCM related clocks and resets

On Sat, Feb 13, 2016 at 12:43 AM, Chen-Yu Tsai <wens@...e.org> wrote:
> On Sat, Feb 13, 2016 at 12:06 AM, Vishnu Patekar
> <vishnupatekar0510@...il.com> wrote:
>> Hello Wens,
>>
>>
>> On Tue, Feb 2, 2016 at 2:44 PM, Chen-Yu Tsai <wens@...e.org> wrote:
>>> On Sun, Jan 31, 2016 at 9:21 AM, Vishnu Patekar
>>> <vishnupatekar0510@...il.com> wrote:
>>>> This adds A83T PRCM related clocks, clock resets.
>>>>
>>>> As a83t apb0 gates clock support is added earlier, this enables it.
>>>> Apart from apb0 gates, other added clocks are compatible with
>>>> earlier sun8i socs.
>>>>
>>>> Signed-off-by: Vishnu Patekar <vishnupatekar0510@...il.com>
>>>> ---
>>>>  arch/arm/boot/dts/sun8i-a83t.dtsi | 44 +++++++++++++++++++++++++++++++++++++++
>>>>  1 file changed, 44 insertions(+)
>>>>
>>>> diff --git a/arch/arm/boot/dts/sun8i-a83t.dtsi b/arch/arm/boot/dts/sun8i-a83t.dtsi
>>>> index ac96aa1..5ea20ff 100644
>>>> --- a/arch/arm/boot/dts/sun8i-a83t.dtsi
>>>> +++ b/arch/arm/boot/dts/sun8i-a83t.dtsi
>>>> @@ -268,6 +268,44 @@
>>>>                                              "mmc2_output",
>>>>                                              "mmc2_sample";
>>>>                 };
>>>> +
>>>> +               cpus_clk: clk@...01400 {
>>>> +                       compatible = "allwinner,sun9i-a80-cpus-clk";
>>>> +                       reg = <0x01f01400 0x4>;
>>>> +                       #clock-cells = <0>;
>>>> +                       clocks = <&osc16Md512>, <&osc24M>, <&pll6>, <&osc16M>;
>>>> +                       clock-output-names = "cpus";
>>>> +               };
>>>> +
>>>> +               ahb0: ahb0_clk {
>>>> +                       compatible = "fixed-factor-clock";
>>>> +                       #clock-cells = <0>;
>>>> +                       clock-div = <1>;
>>>> +                       clock-mult = <1>;
>>>> +                       clocks = <&cpus_clk>;
>>>> +                       clock-output-names = "ahb0";
>>>> +               };
>>>> +
>>>> +               apb0: clk@...0140c {
>>>> +                       compatible = "allwinner,sun8i-a23-apb0-clk";
>>>
>>> This is actually wrong, as it is wrong in sun9i-a80.dtsi.
>>> I've sent a patch series for it.
>> A83T apb0 is different from A80, and it's same as A23, so this should
>> be correct.
>> Please correct me in case I'm missing something.
>
> My user manual (v1.5.1) says A83T apb0 dividers (page. 246) are
> /1, /2, /3, /4, while the A23 is /1, /2, /4, /8.

As Vishnu pointed out on IRC, the A23 driver is wrong. They are in fact,
both one-based dividers. I'll send a patch to fix this.

ChenYu

> ChenYu
>
>>> Also the drivers for "allwinner,sun9i-a80-cpus-clk" and
>>> "allwinner,sun9i-a80-apbs-clk"
>>> are only compiled for CONFIG_MACH_SUN9I. Please add a patch to address this.
>> Okie.
>>>
>>> Regards
>>> ChenYu
>>>
>>>> +                       reg = <0x01f0140c 0x4>;
>>>> +                       #clock-cells = <0>;
>>>> +                       clocks = <&ahb0>;
>>>> +                       clock-output-names = "apb0";
>>>> +               };
>>>> +
>>>> +               apb0_gates: clk@...01428 {
>>>> +                       compatible = "allwinner,sun8i-a83t-apb0-gates-clk";
>>>> +                       reg = <0x01f01428 0x4>;
>>>> +                       #clock-cells = <1>;
>>>> +                       clocks = <&apb0>;
>>>> +                       clock-indices = <0>, <1>,
>>>> +                                       <2>, <3>,
>>>> +                                       <4>, <6>, <7>;
>>>> +                       clock-output-names = "apb0_pio", "apb0_ir",
>>>> +                                       "apb0_timer", "apb0_rsb",
>>>> +                                       "apb0_uart", "apb0_i2c0", "apb0_twd";
>>>> +               };
>>>>         };
>>>>
>>>>         soc {
>>>> @@ -434,5 +472,11 @@
>>>>                         #interrupt-cells = <3>;
>>>>                         interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_HIGH)>;
>>>>                 };
>>>> +
>>>> +               apb0_reset: reset@...014b0 {
>>>> +                       reg = <0x01f014b0 0x4>;
>>>> +                       compatible = "allwinner,sun6i-a31-clock-reset";
>>>> +                       #reset-cells = <1>;
>>>> +               };
>>>>         };
>>>>  };
>>>> --
>>>> 1.9.1
>>>>