linux-kernel - Re: [PATCH 2/6] dt-bindings: mmc: Add support for BCM2712 SD host controller

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Message-ID: <a4cff2fb-dd5e-49a1-ad85-752b6b698293@broadcom.com>
Date: Sun, 14 Apr 2024 08:55:54 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Andrea della Porta <andrea.porta@...e.com>,
 Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>,
 Linus Walleij <linus.walleij@...aro.org>,
 Adrian Hunter <adrian.hunter@...el.com>, Kamal Dasu
 <kamal.dasu@...adcom.com>, Al Cooper <alcooperx@...il.com>,
 linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-gpio@...r.kernel.org, Jonathan Bell <jonathan@...pberrypi.com>,
 Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH 2/6] dt-bindings: mmc: Add support for BCM2712 SD host
 controller



On 4/13/2024 3:14 PM, Andrea della Porta wrote:
> Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> ---
>   .../bindings/mmc/brcm,sdhci-brcmstb.yaml      | 51 ++++++++++++++++++-
>   1 file changed, 50 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml b/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml
> index cbd3d6c6c77f..6aa137d78e4f 100644
> --- a/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml
> +++ b/Documentation/devicetree/bindings/mmc/brcm,sdhci-brcmstb.yaml
> @@ -13,6 +13,7 @@ maintainers:
>   properties:
>     compatible:
>       oneOf:
> +      - const: brcm,bcm2712-sdhci
>         - items:
>             - enum:
>                 - brcm,bcm7216-sdhci
> @@ -26,12 +27,16 @@ properties:
>             - const: brcm,sdhci-brcmstb
>   
>     reg:
> -    maxItems: 2
> +    minItems: 2
> +    maxItems: 4
>   
>     reg-names:
> +    minItems: 2
>       items:
>         - const: host
>         - const: cfg
> +      - const: busisol
> +      - const: lcpll
>   
>     interrupts:
>       maxItems: 1
> @@ -60,6 +65,7 @@ properties:
>       description: Specifies that controller should use auto CMD12
>   
>   allOf:
> +  - $ref: sdhci-common.yaml
>     - $ref: mmc-controller.yaml#
>     - if:
>         properties:
> @@ -71,6 +77,28 @@ allOf:
>         required:
>           - clock-frequency
>   
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: brcm,bcm2712-sdhci
> +
> +    then:
> +      properties:
> +        reg:
> +          maxItems: 4
> +        clock-names:
> +         const: "sw_sdio"
> +
> +    else:
> +      properties:
> +        reg:
> +          minItems: 2
> +          maxItems: 2
> +        reg-names:
> +          minItems: 2
> +          maxItems: 2
> +
>   required:
>     - compatible
>     - reg
> @@ -114,3 +142,24 @@ examples:
>         clocks = <&scmi_clk 245>;
>         clock-names = "sw_sdio";
>       };
> +
> +  - |
> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +
> +      mmc@...000 {
> +        compatible = "brcm,bcm2712-sdhci";
> +        reg = <0x10 0x00fff000  0x0 0x260>,
> +              <0x10 0x00fff400  0x0 0x200>,
> +              <0x10 0x015040b0  0x0 0x4>,  // Bus isolation control

That should be a syscon, not under direct management of the driver 
because there are other bits in that register that are relevant here.

> +              <0x10 0x015200f0  0x0 0x24>; // LCPLL control misc0-8

And likewise, this should be a clock provider, or the firmware could add 
support for configuring the LCPLL since there are other things going on 
there.
-- 
Florian

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