Re: [PATCH v3 1/2] dt-bindings: mmc: Add YAML schemas for the generic MMC options

[Ulf Hansson <ulf.hansson@linaro.org>]

On Tue, 28 May 2019 at 19:26, Maxime Ripard <maxime.ripard@bootlin.com> wrote:
>
> Hi Ulf,
>
> On Tue, May 28, 2019 at 10:40:16AM +0200, Ulf Hansson wrote:
> > > +patternProperties:
> > > +  "^.*@[0-9]+$":
> > > +    properties:
> > > +      reg:
> > > +        items:
> > > +          - minimum: 0
> > > +            maximum: 7
> > > +            description:
> > > +              Must contain the SDIO function number of the function this
> > > +              subnode describes. A value of 0 denotes the memory SD
> > > +              function, values from 1 to 7 denote the SDIO functions.
> > > +
> > > +      broken-hpi:
> > > +        $ref: /schemas/types.yaml#/definitions/flag
> > > +        description:
> > > +          Use this to indicate that the mmc-card has a broken hpi
> > > +          implementation, and that hpi should not be used.
> > > +
> > > +    required:
> > > +      - reg
> > > +
> >
> > [...]
> >
> > > -Use of Function subnodes
> > > -------------------------
> > > -
> > > -On embedded systems the cards connected to a host may need additional
> > > -properties. These can be specified in subnodes to the host controller node.
> > > -The subnodes are identified by the standard 'reg' property.
> > > -Which information exactly can be specified depends on the bindings for the
> > > -SDIO function driver for the subnode, as specified by the compatible string.
> > > -
> > > -Required host node properties when using function subnodes:
> > > -- #address-cells: should be one. The cell is the slot id.
> > > -- #size-cells: should be zero.
> > > -
> > > -Required function subnode properties:
> > > -- reg: Must contain the SDIO function number of the function this subnode
> > > -       describes. A value of 0 denotes the memory SD function, values from
> > > -       1 to 7 denote the SDIO functions.
> > > -
> > > -Optional function subnode properties:
> > > -- compatible: name of SDIO function following generic names recommended practice
> > > -
> >
> > I think most of the information of how we use sub(child) nodes
> > disappeared in this conversion - or at least gets harder to
> > understand. Could we perhaps keep some of this?
>
> Sure, what would you like to keep in particular?

Most of it, so we can understand what can be described in sub-nodes.

Additionally, we should also include what is stated in
Documentation/devicetree/bindings/mmc/mmc-card.txt, as that also
refers to how subnodes should be used, when it has the "mmc-card"
compatible.

Or maybe we should simply move all things related to subnodes into a
separate .yaml?

Kind regards
Uffe