linux-kernel - Re: [PATCH v2 16/22] dt-bindings: rtc: qcom-pm8xxx: add nvmem-cell offset

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Date:   Fri, 10 Feb 2023 23:48:08 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        linux-arm-msm@...r.kernel.org, linux-rtc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v2 16/22] dt-bindings: rtc: qcom-pm8xxx: add nvmem-cell
 offset

On 02/02/2023 16:54:42+0100, Johan Hovold wrote:
> On many Qualcomm platforms the PMIC RTC control and time registers are
> read-only so that the RTC time can not be updated. Instead an offset
> needs be stored in some machine-specific non-volatile memory, which a
> driver can take into account.
> 
> Add an 'offset' nvmem cell which can be used to store a 32-bit offset
> from the Unix epoch so that the RTC time can be updated on such
> platforms.
> 
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>  .../devicetree/bindings/rtc/qcom-pm8xxx-rtc.yaml     | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/rtc/qcom-pm8xxx-rtc.yaml b/Documentation/devicetree/bindings/rtc/qcom-pm8xxx-rtc.yaml
> index 21c8ea08ff0a..b95a69cc9ae0 100644
> --- a/Documentation/devicetree/bindings/rtc/qcom-pm8xxx-rtc.yaml
> +++ b/Documentation/devicetree/bindings/rtc/qcom-pm8xxx-rtc.yaml
> @@ -40,6 +40,16 @@ properties:
>      description:
>        Indicates that the setting of RTC time is allowed by the host CPU.
>  
> +  nvmem-cells:
> +    items:
> +      - description:
> +          four-byte nvmem cell holding a little-endian offset from the Unix
> +          epoch representing the time when the RTC timer was last reset
> +
> +  nvmem-cell-names:
> +    items:
> +      - const: offset
> +
>    wakeup-source: true

The patch doesn't apply because this part of the context is not
upstream. Can you rebase?

>  
>  required:
> @@ -69,6 +79,8 @@ examples:
>            compatible = "qcom,pm8921-rtc";
>            reg = <0x11d>;
>            interrupts = <0x27 0>;
> +          nvmem-cells = <&rtc_offset>;
> +          nvmem-cell-names = "offset";
>          };
>        };
>      };
> -- 
> 2.39.1
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com