linux-kernel - Re: [PATCH v4 4/7] regulator: qcom

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Date:   Mon, 17 Jun 2019 16:05:02 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Cc:     lgirdwood@...il.com, agross@...nel.org, bjorn.andersson@...aro.org,
        robh+dt@...nel.org, mark.rutland@....com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 4/7] regulator: qcom_spmi: Add support for PM8005

On Thu, Jun 13, 2019 at 02:25:53PM -0700, Jeffrey Hugo wrote:

> +static int spmi_regulator_ftsmps426_set_voltage(struct regulator_dev *rdev,
> +					      unsigned selector)
> +{
> +	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
> +	u8 buf[2];
> +	int mV;
> +
> +	mV = spmi_regulator_common_list_voltage(rdev, selector) / 1000;
> +
> +	buf[0] = mV & 0xff;
> +	buf[1] = mV >> 8;
> +	return spmi_vreg_write(vreg, SPMI_FTSMPS426_REG_VOLTAGE_LSB, buf, 2);
> +}

This could just be a set_voltage_sel(), no need for it to be a
set_voltage() operation....

> +static int spmi_regulator_ftsmps426_get_voltage(struct regulator_dev *rdev)
> +{
> +	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
> +	u8 buf[2];
> +
> +	spmi_vreg_read(vreg, SPMI_FTSMPS426_REG_VOLTAGE_LSB, buf, 2);
> +
> +	return (((unsigned int)buf[1] << 8) | (unsigned int)buf[0]) * 1000;
> +}

...or if the conversion is this trivial why do the list_voltage() lookup
above?

> +spmi_regulator_ftsmps426_set_mode(struct regulator_dev *rdev, unsigned int mode)
> +{
> +	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
> +	u8 mask = SPMI_FTSMPS426_MODE_MASK;
> +	u8 val;
> +
> +	switch (mode) {
> +	case REGULATOR_MODE_NORMAL:
> +		val = SPMI_FTSMPS426_MODE_HPM_MASK;
> +		break;
> +	case REGULATOR_MODE_FAST:
> +		val = SPMI_FTSMPS426_MODE_AUTO_MASK;
> +		break;
> +	default:
> +		val = SPMI_FTSMPS426_MODE_LPM_MASK;
> +		break;
> +	}

This should validate, it shouldn't just translate invalid values into
valid ones.

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