linux-kernel - Re: [PATCH 1/2] dt-bindings: clock: meson: add A1 clock controller bindings

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Message-ID: <d9b23872-3d6f-ddb0-d44b-174fb2984232@amlogic.com>
Date:   Fri, 27 Sep 2019 14:08:34 +0800
From:   Jian Hu <jian.hu@...ogic.com>
To:     Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>
CC:     Jianxin Pan <jianxin.pan@...ogic.com>,
        Kevin Hilman <khilman@...libre.com>,
        Rob Herring <robh@...nel.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        <linux-clk@...r.kernel.org>, <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: clock: meson: add A1 clock controller
 bindings

Hi, Jerome

Thank you for review.

On 2019/9/25 22:29, Jerome Brunet wrote:
> On Wed 25 Sep 2019 at 19:44, Jian Hu <jian.hu@...ogic.com> wrote:
> 
> In addition to the comment expressed by Stephen on patch 2
> 
got it.
>> Add the documentation to support Amlogic A1 clock driver,
>> and add A1 clock controller bindings.
>>
>> Signed-off-by: Jian Hu <jian.hu@...ogic.com>
>> Signed-off-by: Jianxin Pan <jianxin.pan@...ogic.com>
>> ---
>>   .../devicetree/bindings/clock/amlogic,a1-clkc.yaml |  65 +++++++++++++
>>   include/dt-bindings/clock/a1-clkc.h                | 102 +++++++++++++++++++++
>>   2 files changed, 167 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/clock/amlogic,a1-clkc.yaml
>>   create mode 100644 include/dt-bindings/clock/a1-clkc.h
>>
>> diff --git a/Documentation/devicetree/bindings/clock/amlogic,a1-clkc.yaml b/Documentation/devicetree/bindings/clock/amlogic,a1-clkc.yaml
>> new file mode 100644
>> index 0000000..f012eb2
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/amlogic,a1-clkc.yaml
>> @@ -0,0 +1,65 @@
>> +/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
>> +/*
>> + * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
>> + */
>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/clock/amlogic,a1-clkc.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: Amlogic Meson A1 Clock Control Unit Device Tree Bindings
>> +
>> +maintainers:
>> +  - Neil Armstrong <narmstrong@...libre.com>
>> +  - Jerome Brunet <jbrunet@...libre.com>
>> +  - Jian Hu <jian.hu@...n.hu.com>
>> +
>> +properties:
>> +  compatible:
>> +    - enum:
>> +        - amlogic,a1-clkc
>> +
>> +  reg:
>> +    minItems: 1
>> +    maxItems: 3
>> +    items:
>> +      - description: peripheral registers
>> +      - description: cpu registers
>> +      - description: pll registers
>> +
>> +  reg-names:
>> +    items:
>> +      - const: peripheral
>> +      - const: pll
>> +      - const: cpu
>> +
>> +  clocks:
>> +    maxItems: 1
>> +    items:
>> +      - description: Input Oscillator (usually at 24MHz)
>> +
>> +  clock-names:
>> +    maxItems: 1
>> +    items:
>> +      - const: xtal
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - reg-names
>> +  - clocks
>> +  - clock-names
>> +  - "#clock-cells"
>> +
>> +examples:
>> +  - |
>> +    clkc: clock-controller {
>> +        compatible = "amlogic,a1-clkc";
>> +        reg = <0x0 0xfe000800 0x0 0x100>,
>> +              <0x0 0xfe007c00 0x0 0x21c>,
>> +              <0x0 0xfd000080 0x0 0x20>;
>> +        reg-names = "peripheral", "pll", "cpu";
> 
> I'm sorry but I don't agree with this. You are trying to regroup several
> controllers into one with this, and it is not OK
> 
> By the looks of it there are 3 different controllers, including one you
> did not implement in the driver.
> 
Yes, In A1, the clock registers include three regions.

I agree with your opinion. I will implement the two clock drivers of 
peripheral and plls first in PATCH V2. And CPU clock driver will be sent 
after the patches are merged.

>> +        clocks = <&xtal;
>> +        clock-names = "xtal";
>> +        #clock-cells = <1>;
> 
> .
>