linux-kernel - Re: [PATCH v14 02/10] mfd: qcom-spmi-pmic: expose the PMIC revid information to clients

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Date:   Sun, 1 May 2022 18:28:29 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Caleb Connolly <caleb.connolly@...aro.org>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v14 02/10] mfd: qcom-spmi-pmic: expose the PMIC revid
 information to clients

On Fri, 29 Apr 2022 23:08:57 +0100
Caleb Connolly <caleb.connolly@...aro.org> wrote:

> Some PMIC functions such as the RRADC need to be aware of the PMIC
> chip revision information to implement errata or otherwise adjust
> behaviour, export the PMIC information to enable this.
> 
> This is specifically required to enable the RRADC to adjust
> coefficients based on which chip fab the PMIC was produced in,
> this can vary per unique device and therefore has to be read at
> runtime.
> 
> Signed-off-by: Caleb Connolly <caleb.connolly@...aro.org>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Tested-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

...

> +/**
> + * qcom_pmic_get() - Get a pointer to the base PMIC device
> + *
> + * This function takes a struct device for a driver which is a child of a PMIC.
> + * And locates the PMIC revision information for it.
> + *
> + * @dev: the pmic function device
> + * @return: the struct qcom_spmi_pmic* pointer associated with the function device
> + */
> +inline const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev)
> +{
> +	struct spmi_device *sdev;
> +	struct qcom_spmi_dev *spmi;
> +
> +	/*
> +	 * Make sure the device is actually a child of a PMIC
> +	 */
> +	if (!of_match_device(pmic_spmi_id_table, dev->parent))
> +		return ERR_PTR(-EINVAL);
> +
> +	sdev = qcom_pmic_get_base_usid(dev->parent);
>  
> -	if (subtype == PM8110_SUBTYPE)
> -		minor = rev2;
> +	if (IS_ERR(sdev))
> +		return ERR_CAST(sdev);
>  
> -	dev_dbg(dev, "%x: %s v%d.%d\n", subtype, name, major, minor);
> +	spmi = (struct qcom_spmi_dev *)dev_get_drvdata(&sdev->dev);

Shouldn't need the cast as dev_get_drvdata() returns void * and you can
implicitly cast that to any other pointer type.

If this is all that comes up in the series I can fixup whilst applying.

Jonathan


> +
> +	return &spmi->pmic;
>  }
> +EXPORT_SYMBOL(qcom_pmic_get);
>