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

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Date:   Wed, 9 Feb 2022 13:07:06 -0600
From:   Rob Herring <robh@...nel.org>
To:     Tony Huang <tonyhuang.sunplus@...il.com>
Cc:     ulf.hansson@...aro.org, lhjeff911@...il.com,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        p.zabel@...gutronix.de, linux-kernel@...r.kernel.org,
        tony.huang@...plus.com, wells.lu@...plus.com, lh.kuo@...plus.com
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.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  max-frequency: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - resets
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    mmc0: mmc@...03b00 {
> +        compatible = "sunplus,sp7021-emmc";
> +        reg = <0x9c003b00 0x180>;
> +        interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
> +        clocks = <&clkc 0x4e>;
> +        resets = <&rstc 0x3e>;
> +        bus-width = <8>;
> +        max-frequency = <52000000>;
> +        non-removable;
> +        disable-wp;
> +        cap-mmc-highspeed;
> +        mmc-ddr-3_3v;
> +        no-sdio;
> +        no-sd;
> +    };
> +
> +    mmc1: mmc@...03e80 {
> +       compatible = "sunplus,sp7021-sdhci";
> +       reg = <0x9c003e80 0x280>;
> +       interrupts = <21 IRQ_TYPE_LEVEL_HIGH>;
> +       clocks = <&clkc 0x4f>;
> +       resets = <&rstc 0x3f>;
> +       pinctrl-names = "default";
> +       pinctrl-0 = <&mmc1_mux &mmc1_mux_cd>;
> +       max-frequency = <52000000>;
> +    };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index fb18ce7..cb46a55 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -18242,6 +18242,12 @@ L:	netdev@...r.kernel.org
>  S:	Maintained
>  F:	drivers/net/ethernet/dlink/sundance.c
>  
> +SUNPLUS MMC DRIVER
> +M:	Tony Huang <tonyhuang.sunplus@...il.com>
> +M:	Li-hao Kuo <lhjeff911@...il.com>
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/mmc/sunplu-mmc.yaml
> +
>  SUPERH
>  M:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
>  M:	Rich Felker <dalias@...c.org>
> -- 
> 2.7.4
> 
>