Re: [PATCH 01/12] mmc: dt-bindings: update Mediatek MMC bindings

Chaotian Jing
2017-09-29T01:56:02Z

On Wed, 2017-09-27 at 09:18 +0800, Chaotian Jing wrote:
> On Wed, 2017-09-27 at 00:33 +0200, Ulf Hansson wrote:
> > On 14 September 2017 at 04:10, Chaotian Jing <chaotian.jing-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org> wrote:
> > > On Wed, 2017-09-13 at 09:10 -0500, Rob Herring wrote:
> > >> On Tue, Sep 12, 2017 at 05:07:41PM +0800, Chaotian Jing wrote:
> > >> > Change the comptiable for support of multi-platform
> > >> > Add description for reg
> > >> > Add description for source_cg
> > >> > Add description for mediatek,latch-ck
> > >>
> > >> This is at least the 3rd patch with exactly the same vague subject.
> > >> Please make the subject somewhat unique.
> > >>
> > > Thx, will change the subject at next version
> > >> >
> > >> > Signed-off-by: Chaotian Jing <chaotian.jing-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> > >> > ---
> > >> > Documentation/devicetree/bindings/mmc/mtk-sd.txt | 13 ++++++++++---
> > >> > 1 file changed, 10 insertions(+), 3 deletions(-)
> > >> >
> > >> > diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.txt b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
> > >> > index 4182ea3..405cd06 100644
> > >> > --- a/Documentation/devicetree/bindings/mmc/mtk-sd.txt
> > >> > +++ b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
> > >> > @@ -7,10 +7,15 @@ This file documents differences between the core properties in mmc.txt
> > >> > and the properties used by the msdc driver.
> > >> >
> > >> > Required properties:
> > >> > -- compatible: Should be "mediatek,mt8173-mmc","mediatek,mt8135-mmc"
> > >> > +- compatible: value should be either of the following.
> > >> > + "mediatek,mt8135-mmc": for mmc host ip compatible with mt8135
> > >> > + "mediatek,mt8173-mmc": for mmc host ip compatible with mt8173
> > >> > + "mediatek,mt2701-mmc": for mmc host ip compatible with mt2701
> > >> > + "mediatek,mt2712-mmc": for mmc host ip compatible with mt2712
> > >> > +- reg: physical base address of the controller and length
> > >> > - interrupts: Should contain MSDC interrupt number
> > >> > -- clocks: MSDC source clock, HCLK
> > >> > -- clock-names: "source", "hclk"
> > >> > +- clocks: MSDC source clock, HCLK, source_cg
> > >> > +- clock-names: "source", "hclk", "source_cg"
> > >>
> > >> All chips support source_cg? That's not backwards compatible for
> > >> existing compatible strings if the driver requires it.
> > > Not all chips support source_cg, for chips which do not support
> > > source_cg, no need source_cg here, and the driver will parse it
> > > to know if current chip support it.
> >
> > In such case you must not add add a required binding for it. I think
> > that is what Rob is trying to point out for you.
> >
> > [...]
> >
> > Kind regards
> > Uffe
> The source_cg is required(MUST) at MT2712 and future SoCs, but not
> required(do not have it) at previous SoCs, so that put it at required
> properties, let the driver to handle it.

Any other comments about it ? still must not add a required binding for
it ? if add a optional binding for it, how to add it ? as cannot
duplicate "clocks" & "clock-names" in one node.

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