linux-kernel - Re: [PATCH] dt-bindings: nvmem: add binding for QTI SPMI SDAM

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Date:   Sat, 28 Dec 2019 19:01:40 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Shyam Kumar Thella <sthella@...eaurora.org>
Cc:     agross@...nel.org, srinivas.kandagatla@...aro.org,
        robh+dt@...nel.org, mark.rutland@....com,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: nvmem: add binding for QTI SPMI SDAM

On Mon 23 Dec 21:32 PST 2019, Shyam Kumar Thella wrote:

> QTI SDAM allows PMIC peripherals to access the shared memory that is
> available on QTI PMICs. Add documentation for it.
> 
> Signed-off-by: Shyam Kumar Thella <sthella@...eaurora.org>
> ---
>  .../devicetree/bindings/nvmem/qcom,spmi-sdam.yaml  | 79 ++++++++++++++++++++++
>  1 file changed, 79 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/nvmem/qcom,spmi-sdam.yaml
> 
> diff --git a/Documentation/devicetree/bindings/nvmem/qcom,spmi-sdam.yaml b/Documentation/devicetree/bindings/nvmem/qcom,spmi-sdam.yaml
> new file mode 100644
> index 0000000..8961a99
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/nvmem/qcom,spmi-sdam.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/nvmem/qcom,spmi-sdam.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Technologies, Inc. SPMI SDAM DT bindings
> +
> +maintainers:
> +  - Shyam Kumar Thella <sthella@...eaurora.org>
> +
> +description: |
> +  The SDAM provides scratch register space for the PMIC clients. This
> +  memory can be used by software to store information or communicate
> +  to/from the PBUS.
> +
> +allOf:
> +  - $ref: "nvmem.yaml#"
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,spmi-sdam
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +patternProperties:
> +  "^.*@[0-9a-f]+$":
> +    type: object
> +
> +    properties:
> +      reg:
> +        maxItems: 1
> +        description:
> +          Offset and size in bytes within the storage device.
> +
> +      bits:
> +        maxItems: 1
> +        items:
> +          items:
> +            - minimum: 0
> +              maximum: 7
> +              description:
> +                Offset in bit within the address range specified by reg.
> +            - minimum: 1
> +              description:
> +                Size in bit within the address range specified by reg.
> +
> +    required:
> +      - reg
> +
> +    additionalProperties: false
> +
> +examples:
> +  - |
> +      sdam_1: nvram@...0 {
> +         #address-cells = <1>;
> +         #size-cells = <1>;
> +         compatible = "qcom,spmi-sdam";
> +          reg = <0xb000 0x100>;
> +
> +          /* Data cells */
> +          restart_reason: restart@50 {

So this register has moved out of the PON register set? What component
in the system is going to reference this? Should it have a compatible,
in the same way as "syscon-reboot-mode" does?

Regards,
Bjorn

> +              reg = <0x50 0x1>;
> +              bits = <7 2>;
> +          };
> +      };
> +...
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>  a Linux Foundation Collaborative Project