linux-kernel - RE: [PATCH v3 1/2] dt-binding: mmc: Add mmc yaml file for Sunplus SP7021

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Date:   Mon, 14 Feb 2022 02:02:09 +0000
From:   Tony Huang 黃懷厚 <tony.huang@...plus.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>
CC:     Tony Huang <tonyhuang.sunplus@...il.com>,
        "lhjeff911@...il.com" <lhjeff911@...il.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Wells Lu 呂芳騰 <wells.lu@...plus.com>,
        Lh Kuo 郭力豪 <lh.Kuo@...plus.com>
Subject: RE: [PATCH v3 1/2] dt-binding: mmc: Add mmc yaml file for Sunplus
 SP7021

Dear Uffe:

> Subject: Re: [PATCH v3 1/2] dt-binding: mmc: Add mmc yaml file for Sunplus
> SP7021
> 
> On Thu, 10 Feb 2022 at 09:56, Tony Huang 黃懷厚
> <tony.huang@...plus.com> wrote:
> >
> > Dear Robh:
> >
> > > Subject: Re: [PATCH v3 1/2] dt-binding: mmc: Add mmc yaml file for
> > > Sunplus
> > > SP7021
> > >
> > > On Wed, Feb 09, 2022 at 06:41:06PM +0800, Tony Huang wrote:
> > > > Add mmc yaml file for Sunplus SP7021
> > > >
> > > > Signed-off-by: Tony Huang <tonyhuang.sunplus@...il.com>
> > > > ---
> > > > Changes in v3:
> > > >  - combine sdcard and eMMC into one driver.
> > > >
> > > >  .../devicetree/bindings/mmc/sunplus-mmc.yaml       | 76
> > > ++++++++++++++++++++++
> > > >  MAINTAINERS                                        |  6 ++
> > > >  2 files changed, 82 insertions(+)  create mode 100644
> > > > Documentation/devicetree/bindings/mmc/sunplus-mmc.yaml
> > > >
> > > > diff --git
> > > > a/Documentation/devicetree/bindings/mmc/sunplus-mmc.yaml
> > > > b/Documentation/devicetree/bindings/mmc/sunplus-mmc.yaml
> > > > new file mode 100644
> > > > index 0000000..8f44d13
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/mmc/sunplus-mmc.yaml
> > > > @@ -0,0 +1,76 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) #
> > > > +Copyright
> > > > +(C) Sunplus Ltd. Co. 2021 %YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/mmc/sunplus-mmc.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: sunplus MMC controller
> > > > +
> > > > +allOf:
> > > > +  - $ref: "mmc-controller.yaml"
> > > > +
> > > > +maintainers:
> > > > +  - Tony Huang <tonyhuang.sunplus@...il.com>
> > > > +  - Li-hao Kuo <lhjeff911@...il.com>
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    enum:
> > > > +      - sunplus,sp7021-emmc
> > > > +      - sunplus,sp7021-sdhci
> > >
> > > Why are these still different? Looking at the driver, it seems the
> > > settings are the same for both. And for clock speeds, we have
> > > properties to control them as they can be board specific.
> > >
> >
> > The register base address of emmc and sd card are different.
> > eMMC and sdcard are individual hardware settings
> 
> When I looked at the previous version of the driver(s) that was posted, I got the
> impression that you have some registers in the controller that are specific for
> eMMC, SD or SDIO.
> 
> So, depending on how the controller is going to be used (for eMMC, SD or SDIO)
> it's needs to be configured differently. Right?
> 
> If I got this right, I think you can instead use the existing common DT
> properties, "no-sd", "no-sdio", "no-mmc" to explain how each controller is
> configured.
> 

OK, I will use DT> properties, "no-sd", "no-sdio", "no-mmc"  to explain how 
each controller is configured.
Thanks