Re: [PATCH v3 02/24] dt-bindings: memory: mediatek: Convert SMI to DT schema

Krzysztof Kozlowski
2020-10-06T07:17:41Z

On Tue, 6 Oct 2020 at 06:27, Yong Wu <yong.wu@mediatek.com> wrote:
>
> On Fri, 2020-10-02 at 13:08 +0200, Krzysztof Kozlowski wrote:
> > On Wed, Sep 30, 2020 at 03:06:25PM +0800, Yong Wu wrote:
> > > Convert MediaTek SMI to DT schema.
> > >
> > > Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> > > ---
> > > .../mediatek,smi-common.txt | 49 ---------
> > > .../mediatek,smi-common.yaml | 100 ++++++++++++++++++
> > > .../memory-controllers/mediatek,smi-larb.txt | 49 ---------
> > > .../memory-controllers/mediatek,smi-larb.yaml | 91 ++++++++++++++++
> > > 4 files changed, 191 insertions(+), 98 deletions(-)
> > > delete mode 100644 Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.txt
> > > create mode 100644 Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml
> > > delete mode 100644 Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.txt
> > > create mode 100644 Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.yaml
> ...
> > > +properties:
> > > + compatible:
> > > + oneOf:
> > > + - enum:
> > > + - mediatek,mt2701-smi-common
> > > + - mediatek,mt2712-smi-common
> > > + - mediatek,mt6779-smi-common
> > > + - mediatek,mt8173-smi-common
> > > + - mediatek,mt8183-smi-common
> > > +
> > > + - description: for mt7623
> > > + items:
> > > + - const: mediatek,mt7623-smi-common
> > > + - const: mediatek,mt2701-smi-common
> > > +
> > > + reg:
> > > + maxItems: 1
> > > +
> > > + clocks:
> > > + description: |
> > > + apb and smi are mandatory. the async is only for generation 1 smi HW.
> > > + gals(global async local sync) also is optional, here is the list which
> > > + require gals: mt6779 and mt8183.
> > > + minItems: 2
> > > + maxItems: 4
> > > + items:
> > > + - description: apb is Advanced Peripheral Bus clock, It's the clock for
> > > + setting the register.
> > > + - description: smi is the clock for transfer data and command.
> > > + - description: async is asynchronous clock, it help transform the smi clock
> > > + into the emi clock domain.
> > > + - description: gals0 is the path0 clock of gals.
> > > + - description: gals1 is the path1 clock of gals.
> > > +
> > > + clock-names:
> > > + oneOf:
> > > + - items:
> > > + - const: apb
> > > + - const: smi
> > > + - items:
> > > + - const: apb
> > > + - const: smi
> > > + - const: async
> > > + - items:
> > > + - const: apb
> > > + - const: smi
> > > + - const: gals0
> > > + - const: gals1
> >
> > Similarly to my comment to other properties, this requirement per
> > compatible should be part of the schema within 'if-then'.
>
> I'm not so familiar with this format. Do this has "if-then-'else
> if'-then-else"?

These are mutually exclusive conditions, so you can skip else:
- if-then
- if-then
- if-then
It will be more readable then stacking 'if' under 'else'

>
> I tried below instead of the clocks segment above:
>
> ===================================
> if:
> properties:
> compatible:

Missing contains. Just take an example from some existing schema.

> enum:
> - mediatek,mt6779-smi-common
> - mediatek,mt8183-smi-common
>
> then:
> properties:
> clock:
> items:
> - description: apb is the clock for setting the register..
> - description: smi is the clock for transfer data and command.
> - description: gals0 is the path0 clock of gals(global async
> local sync).
> - description: gals1 is the path1 clock of gals.
> clock-names:
> items:
> - const: apb
> - const: smi
> - const: gals0
> - const: gals1
> else:
> if:
> properties:
> compatible:
> contains:
> enum:
> - mediatek,mt2701-smi-common
>
> then:
> properties:
> clocks:
> items:
> - description: apb is the clock for setting the register.
> - description: smi is the clock for transfer data and command.
> - description: async is asynchronous clock, it help transform
> the smi clock
> into the emi clock domain.
> clock-names:
> items:
> - const: apb
> - const: smi
> - const: async
> else:
> properties:
> clocks:
> items:
> - description: apb is the clock for setting the register.
> - description: smi is the clock for transfer data and
> command.
> clock-names:
> items:
> - const: apb
> - const: smi
> ================================
>
> But I got a warning when dt_binding_check:
>
> CHKDT
> Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml
> SCHEMA
> Documentation/devicetree/bindings/processed-schema-examples.yaml
> DTC
> Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.example.dt.yaml
> CHECK
> Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.example.dt.yaml
> .../Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.example.dt.yaml: smi@14022000: 'clock-names', 'clocks' do not match any of the regexes: 'pinctrl-[0-9]+'

There are several files which already choose different clocks based on
compatible, simple grep shows them:
Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.yaml
Documentation/devicetree/bindings/clock/idt,versaclock5.yaml

Best regards,
Krzysztof