linux-kernel - Re: [PATCH V2 2/4] Documentation: bindings: clk: Add bindings for i.MX BLK

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Date:   Thu, 6 May 2021 08:50:39 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     Rob Herring <robh@...nel.org>
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, p.zabel@...gutronix.de,
        l.stach@...gutronix.de, krzk@...nel.org, agx@...xcpu.org,
        marex@...x.de, andrew.smirnov@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ping.bai@....com,
        frieder.schrempf@...tron.de, aford173@...il.com, abel.vesa@....com,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V2 2/4] Documentation: bindings: clk: Add bindings for
 i.MX BLK_CTL

Hi Rob,

On 2021/5/6 7:08, Rob Herring wrote:
> On Fri, Apr 30, 2021 at 01:27:44PM +0800, Peng Fan (OSS) wrote:
>> From: Peng Fan <peng.fan@....com>
>>
>> Document the i.MX BLK_CTL with its devicetree properties.
>>
>> Signed-off-by: Peng Fan <peng.fan@....com>
>> ---
>>   .../bindings/soc/imx/fsl,imx-blk-ctl.yaml     | 73 +++++++++++++++++++
>>   1 file changed, 73 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/soc/imx/fsl,imx-blk-ctl.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/soc/imx/fsl,imx-blk-ctl.yaml b/Documentation/devicetree/bindings/soc/imx/fsl,imx-blk-ctl.yaml
>> new file mode 100644
>> index 000000000000..a491b63de50c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx-blk-ctl.yaml
>> @@ -0,0 +1,73 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/soc/imx/fsl,imx-blk-ctl.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: NXP i.MX BLK_CTL
>> +
>> +maintainers:
>> +  - Peng Fan <peng.fan@....com>
>> +
>> +description:
>> +  i.MX BLK_CTL is a conglomerate of different GPRs that are
>> +  dedicated to a specific subsystem. It usually contains
>> +  clocks and resets amongst other things. Here we take the clocks
>> +  and resets as virtual PDs, the reason we could not take it as
>> +  clock provider is there is A/B lock issue between power domain
>> +  and clock.
>> +
>> +properties:
>> +  compatible:
>> +    items:
>> +      - enum:
>> +          - fsl,imx8mm-dispmix-blk-ctl
>> +          - fsl,imx8mm-vpumix-blk-ctl
>> +      - const: syscon
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  "#power-domain-cells":
>> +    const: 1
>> +
>> +  power-domains:
>> +    minItems: 1
>> +    maxItems: 32
>> +
>> +  power-domain-names:
>> +    minItems: 1
>> +    maxItems: 32
> 
> Please describe why there's a range and we don't enumerate each entry.

Each BLK-CTL have different input power domains, they
have different names. So it is hard to write down each
power domain for each BLK-CTL.

Same to below clocks and clock-names.

Thanks,
Peng.

> 
>> +
>> +  '#reset-cells':
>> +    const: 1
>> +
>> +  clocks:
>> +    minItems: 1
>> +    maxItems: 32
>> +
>> +  clock-names:
>> +    minItems: 1
>> +    maxItems: 32
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - power-domains
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/imx8mm-clock.h>
>> +
>> +    dispmix_blk_ctl: blk-ctl@...28000 {
>> +      compatible = "fsl,imx8mm-dispmix-blk-ctl", "syscon";
>> +      reg = <0x32e28000 0x100>;
>> +      #power-domain-cells = <1>;
>> +      power-domains = <&pgc_dispmix>, <&pgc_mipi>;
>> +      power-domain-names = "dispmix", "mipi";
>> +      clocks = <&clk IMX8MM_CLK_DISP_ROOT>, <&clk IMX8MM_CLK_DISP_AXI_ROOT>,
>> +               <&clk IMX8MM_CLK_DISP_APB_ROOT>;
>> +      clock-names = "disp", "axi", "apb";
>> +    };
>> -- 
>> 2.30.0
>>