Re: [PATCH v4 1/3] dt-bindings: mmc: Add Sparx5 SDHCI controller bindings

Alexandre Belloni
2020-08-25T08:48:00Z

On 25/08/2020 09:33:45+0200, Ulf Hansson wrote:
> On Mon, 24 Aug 2020 at 17:10, Lars Povlsen <lars.povlsen@microchip.com> wrote:
> >
> > The Sparx5 SDHCI controller is based on the Designware controller IP.
> >
> > Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
> > ---
> > .../mmc/microchip,dw-sparx5-sdhci.yaml | 65 +++++++++++++++++++
> > 1 file changed, 65 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml b/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
> > new file mode 100644
> > index 0000000000000..55883290543b9
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
> > @@ -0,0 +1,65 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mmc/microchip,dw-sparx5-sdhci.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Microchip Sparx5 Mobile Storage Host Controller Binding
> > +
> > +allOf:
> > + - $ref: "mmc-controller.yaml"
> > +
> > +maintainers:
> > + - Lars Povlsen <lars.povlsen@microchip.com>
> > +
> > +# Everything else is described in the common file
> > +properties:
> > + compatible:
> > + const: microchip,dw-sparx5-sdhci
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + interrupts:
> > + maxItems: 1
> > +
> > + clocks:
> > + maxItems: 1
> > + description:
> > + Handle to "core" clock for the sdhci controller.
> > +
> > + clock-names:
> > + items:
> > + - const: core
> > +
> > + microchip,clock-delay:
> > + description: Delay clock to card to meet setup time requirements.
> > + Each step increase by 1.25ns.
> > + $ref: "/schemas/types.yaml#/definitions/uint32"
> > + minimum: 1
> > + maximum: 15
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupts
> > + - clocks
> > + - clock-names
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/interrupt-controller/arm-gic.h>
> > + #include <dt-bindings/clock/microchip,sparx5.h>
> > + sdhci0: mmc@600800000 {
>
> Nitpick:
>
> I think we should use solely "mmc[n]" here. So:
>
> mmc0@600800000 {
>
> Please update patch3/3 accordingly as well.

This is not what the devicetree specification says. 2.2.2 says that the
generic name is mmc, not mmc[n]. Since there is a proper unit-address, I
don't see the need for an index here.

>
> > + compatible = "microchip,dw-sparx5-sdhci";
> > + reg = <0x00800000 0x1000>;
> > + pinctrl-0 = <&emmc_pins>;
> > + pinctrl-names = "default";
> > + clocks = <&clks CLK_ID_AUX1>;
> > + clock-names = "core";
> > + assigned-clocks = <&clks CLK_ID_AUX1>;
> > + assigned-clock-rates = <800000000>;
> > + interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
> > + bus-width = <8>;
> > + microchip,clock-delay = <10>;
> > + };
>
> Kind regards
> Uffe

--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering