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SubjectRe:Re: [PATCH v4 2/4] dt-bindings: mfd: sprd: Add bindings for ums512 global registers
Hi Stephen,

Thanks for the review.

At 2021-10-14 06:04:32, "Stephen Boyd" <sboyd@kernel.org> wrote:
>Quoting Chunyan Zhang (2021-09-22 23:41:35)
>> diff --git a/Documentation/devicetree/bindings/mfd/sprd,ums512-glbreg.yaml b/Documentation/devicetree/bindings/mfd/sprd,ums512-glbreg.yaml
>> new file mode 100644
>> index 000000000000..3522f3d2d8de
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mfd/sprd,ums512-glbreg.yaml
>> @@ -0,0 +1,68 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/mfd/sprd,ums512-glbreg.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Unisoc System Global Register Device Tree Bindings
>> +
>> +maintainers:
>> + - Orson Zhai <orsonzhai@gmail.com>
>> + - Baolin Wang <baolin.wang7@gmail.com>
>> + - Chunyan Zhang <zhang.lyra@gmail.com>
>> +
>> +description:
>> + Unisoc system global registers provide register map
>> + for clocks and some multimedia modules of the SoC.
>> +
>> +properties:
>> + "#address-cells": true
>> + "#size-cells": true
>> +
>> + compatible:
>> + items:
>> + - const: sprd,ums512-glbregs
>> + - const: syscon
>> + - const: simple-mfd
>> +
>> + ranges:
>> + maxItems: 1
>> +
>> + reg:
>> + maxItems: 1
>> +
>> +patternProperties:
>> + "^.*@[0-9a-f]+$":
>> + # Child node
>> + type: object
>> + $ref: "../clock/sprd,ums512-clk.yaml"
>> + description:
>> + Clock controller for the SoC clocks.
>> +
>> +required:
>> + - compatible
>> + - reg
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> + - |
>> + ap_apb_regs: syscon@71000000 {
>> + compatible = "sprd,ums512-glbregs", "syscon", "simple-mfd";
>> + reg = <0x71000000 0x3000>;
>> + #address-cells = <1>;
>> + #size-cells = <1>;
>> + ranges = <0 0x71000000 0x3000>;
>> +
>> + clock-controller@0 {
>> + compatible = "sprd,ums512-apahb-gate";
>
>Why is this a subnode of a syscon and simple-mfd? Why not put the>clock-controller@71000000 directly onto the bus? Does making it a child
>node help somehow?

These clocks are at the same register range with global registers. I originally put them directly onto the bus indeed when submitting the patches for SC9863A clocks last year, and it had a private property named 'sprd,syscon' which could provide regmap for these clocks.

Rob suggested [1] us to make them a child of the syscon, and would not need the private property 'sprd, syscon' then.

Thanks,
Chunyan

[1] https://lkml.org/lkml/2019/12/26/212

>
>> + reg = <0x0 0x2000>;
>> + #clock-cells = <1>;
>> + };
>> + };
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