On Fri, Apr 19, 2024 at 03:58:10PM +0300, Jan Dakinevich wrote:
> Add device tree bindings for A1 SoC audio clock and reset controllers.
>
> Signed-off-by: Jan Dakinevich <jan.dakinevich@xxxxxxxxxxxxxxxxx>
> ---
>
> This controller has 6 mandatory and up to 20 optional clocks. To describe
> this, I use 'additionalItems'. It produces correct processed-schema.json:
>
> "clock-names": {
> "maxItems": 26,
> "items": [
> {
> "const": "pclk"
> },
> {
> "const": "dds_in"
> },
> {
> "const": "fclk_div2"
> },
> {
> "const": "fclk_div3"
> },
> {
> "const": "hifi_pll"
> },
> {
> "const": "xtal"
> }
> ],
> "additionalItems": {
> "oneOf": [
> {
> "pattern": "^slv_sclk[0-9]$"
> },
> {
> "pattern": "^slv_lrclk[0-9]$"
> }
> ]
> },
> "type": "array",
> "minItems": 6
> },
>
> and it behaves as expected. However, the checking is followed by
> complaints like this:
>
> Documentation/devicetree/bindings/clock/amlogic,a1-audio-clkc.yaml: properties:clock-names:additionalItems: {'oneOf': [{'pattern': '^slv_sclk[0-9]$'}, {'pattern': '^slv_lrclk[0-9]$'}]} is not of type 'boolean'
>
> And indeed, 'additionalItems' has boolean type in meta-schema. So, how to
> do it right?
The meta-schemas are written both to prevent nonsense that json-schema
allows by default (e.g additionalitems (wrong case)) and constraints to
follow the patterns we expect. I'm happy to loosen the latter case if
there's really a need.
Generally, most bindings shouldn't be using 'additionalItems' at all as
all entries should be defined, but there's a few exceptions. Here, the
only reasoning I see is 26 entries is a lot to write out, but that
wouldn't really justify it. As Krzysztof pointed out, you either have
the clocks in the h/w or you don't, so saying they are variable is
suspect.
Rob
