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Message-ID: <9ce24f8d-5800-4604-abb4-5586d6c385e0@salutedevices.com>
Date: Thu, 28 Mar 2024 22:43:41 +0300
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Subject: Re: [RFC PATCH v2 3/5] dt-bindings: clock: meson: document A1 SoC
 audio clock controller driver
Content-Language: en-US
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>, Neil Armstrong
	<neil.armstrong@linaro.org>, Jerome Brunet <jbrunet@baylibre.com>, Michael
 Turquette <mturquette@baylibre.com>, Stephen Boyd <sboyd@kernel.org>, Rob
 Herring <robh@kernel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>,
	Kevin Hilman <khilman@baylibre.com>, Martin Blumenstingl
	<martin.blumenstingl@googlemail.com>, Philipp Zabel <p.zabel@pengutronix.de>,
	<linux-amlogic@lists.infradead.org>, <linux-clk@vger.kernel.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>
References: <20240328010831.884487-1-jan.dakinevich@salutedevices.com>
 <20240328010831.884487-4-jan.dakinevich@salutedevices.com>
 <cff5e036-7f7c-4270-be0c-f49b196a502b@linaro.org>
From: Jan Dakinevich <jan.dakinevich@salutedevices.com>
In-Reply-To: <cff5e036-7f7c-4270-be0c-f49b196a502b@linaro.org>
Content-Type: text/plain; charset="UTF-8"
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On 3/28/24 12:01, Krzysztof Kozlowski wrote:
> On 28/03/2024 02:08, Jan Dakinevich wrote:
>> Add device tree bindings for A1 SoC audio clock and reset controllers.
>>
>> Signed-off-by: Jan Dakinevich <jan.dakinevich@salutedevices.com>
>> ---
> 
>> +title: Amlogic A1 Audio Clock Control Unit and Reset Controller
>> +
>> +maintainers:
>> +  - Neil Armstrong <neil.armstrong@linaro.org>
>> +  - Jerome Brunet <jbrunet@baylibre.com>
>> +  - Jan Dakinevich <jan.dakinevich@salutedevices.com>
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - amlogic,a1-audio-clkc
>> +      - amlogic,a1-audio2-clkc
> 
> What is "2"?
> 

This is the second clock controller. I couldn't think of a better name.

> If there is going to be any new version/resend:

Definitely, this is not the final version. Thank you for comments!


>> +
>> +  '#clock-cells':
>> +    const: 1
>> +
>> +  '#reset-cells':
>> +    const: 1
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    minItems: 6
>> +    maxItems: 7
>> +
>> +  clock-names:
>> +    minItems: 6
>> +    maxItems: 7
>> +
>> +required:
>> +  - compatible
>> +  - '#clock-cells'
>> +  - reg
>> +  - clocks
>> +  - clock-names
>> +
>> +allOf:
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            enum:
>> +              - amlogic,a1-audio-clkc
>> +    then:
>> +      properties:
>> +        clocks:
>> +          items:
>> +            - description: input core clock
>> +            - description: input main peripheral bus clock
>> +            - description: input dds_in
>> +            - description: input fixed pll div2
>> +            - description: input fixed pll div3
>> +            - description: input hifi_pll
>> +            - description: input oscillator (usually at 24MHz)
>> +        clocks-names:
>> +          items:
>> +            - const: core
>> +            - const: pclk
>> +            - const: dds_in
>> +            - const: fclk_div2
>> +            - const: fclk_div3
>> +            - const: hifi_pll
>> +            - const: xtal
>> +      required:
>> +        - '#reset-cells'
>> +    else:
>> +      properties:
>> +        clocks:
>> +          items:
>> +            - description: input main peripheral bus clock
>> +            - description: input dds_in
>> +            - description: input fixed pll div2
>> +            - description: input fixed pll div3
>> +            - description: input hifi_pll
>> +            - description: input oscillator (usually at 24MHz)
>> +        clock-names:
>> +          items:
>> +            - const: pclk
>> +            - const: dds_in
>> +            - const: fclk_div2
>> +            - const: fclk_div3
>> +            - const: hifi_pll
>> +            - const: xtal
> 
> #reset-cells: false
> 
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/amlogic,a1-pll-clkc.h>
>> +    #include <dt-bindings/clock/amlogic,a1-peripherals-clkc.h>
>> +    #include <dt-bindings/clock/amlogic,a1-audio-clkc.h>
>> +    audio {
> 
> If there is going to be any new version/resend:
> soc {
> 
>> +        #address-cells = <2>;
>> +        #size-cells = <2>;
>> +
>> +        clkc_audio: audio-clock-controller@fe050000 {
> 
> Node names should be generic. See also an explanation and list of
> examples (not exhaustive) in DT specification:
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
> So: clock-controller
> 
>> +                compatible = "amlogic,a1-audio-clkc";
>> +                reg = <0x0 0xfe050000 0x0 0xb0>;
>> +                #clock-cells = <1>;
>> +                #reset-cells = <1>;
>> +                clocks = <&clkc_audio2 AUD2_CLKID_AUDIOTOP>,
>> +                         <&clkc_periphs CLKID_AUDIO>,
>> +                         <&clkc_periphs CLKID_DDS_IN>,
>> +                         <&clkc_pll CLKID_FCLK_DIV2>,
>> +                         <&clkc_pll CLKID_FCLK_DIV3>,
>> +                         <&clkc_pll CLKID_HIFI_PLL>,
>> +                         <&xtal>;
>> +                clock-names = "core",
>> +                              "pclk",
>> +                              "dds_in",
>> +                              "fclk_div2",
>> +                              "fclk_div3",
>> +                              "hifi_pll",
>> +                              "xtal";
>> +        };
>> +
>> +        clkc_audio2: audio-clock-controller@fe054800 {
> 
> clock-controller
> (so I expect resend)
> 
>> +                compatible = "amlogic,a1-audio2-clkc";
>> +                reg = <0x0 0xfe054800 0x0 0x20>;
>> +                #clock-cells = <1>;
>> +                clocks = <&clkc_periphs CLKID_AUDIO>,
>> +                         <&clkc_periphs CLKID_DDS_IN>,
>> +                         <&clkc_pll CLKID_FCLK_DIV2>,
>> +                         <&clkc_pll CLKID_FCLK_DIV3>,
>> +                         <&clkc_pll CLKID_HIFI_PLL>,
>> +                         <&xtal>;
>> +                clock-names = "pclk",
>> +                              "dds_in",
>> +                              "fclk_div2",
>> +                              "fclk_div3",
>> +                              "hifi_pll",
>> +                              "xtal";
>> +        };
>> +    };
>> diff --git a/include/dt-bindings/clock/amlogic,a1-audio-clkc.h b/include/dt-bindings/clock/amlogic,a1-audio-clkc.h
>> new file mode 100644
>> index 000000000000..b30df3b1ae08
>> --- /dev/null
>> +++ b/include/dt-bindings/clock/amlogic,a1-audio-clkc.h
>> @@ -0,0 +1,122 @@
>> +/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
>> +/*
>> + * Copyright (c) 2024, SaluteDevices. All Rights Reserved.
>> + *
>> + * Author: Jan Dakinevich <jan.dakinevich@salutedevices.com>
>> + */
>> +
>> +#ifndef __A1_AUDIO_CLKC_BINDINGS_H
>> +#define __A1_AUDIO_CLKC_BINDINGS_H
>> +
>> +#define AUD_CLKID_DDR_ARB		1
>> +#define AUD_CLKID_TDMIN_A		2
>> +#define AUD_CLKID_TDMIN_B		3
>> +#define AUD_CLKID_TDMIN_LB		4
> 
> Why both clock controllers have the same clocks? This is confusing. It
> seems you split same block into two!
> 
> Best regards,
> Krzysztof
> 

-- 
Best regards
Jan Dakinevich