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

Quoting ChunyanZhang (2021-10-13 16:49:40)

At 2021-10-14 06:04:32, "Stephen Boyd" [off-list ref] wrote:

quoted

Quoting Chunyan Zhang (2021-09-22 23:41:35)

quoted

diff --git a/Documentation/devicetree/bindings/mfd/sprd,ums512-glbreg.yaml b/Documentation/devicetree/bindings/mfd/sprd,ums512-glbreg.yaml
+
+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.

Why do you need to use a syscon? Are the registers shared with some
other driver?

2019 was two years ago...