linux-kernel - Re: [PATCH 5/5] regulator: qcom_rpm-regulator: Add support for pm8018 rpm regulator

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Message-ID: <20160617165352.GA1256@tuxbot>
Date:	Fri, 17 Jun 2016 09:53:52 -0700
From:	Bjorn Andersson <bjorn.andersson@...aro.org>
To:	Neil Armstrong <narmstrong@...libre.com>
Cc:	dmitry.torokhov@...il.com, andy.gross@...aro.org,
	david.brown@...aro.org, lee.jones@...aro.org, lgirdwood@...il.com,
	broonie@...nel.org, a.zummo@...ertech.it,
	alexandre.belloni@...e-electrons.com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-soc@...r.kernel.org, rtc-linux@...glegroups.com
Subject: Re: [PATCH 5/5] regulator: qcom_rpm-regulator: Add support for
 pm8018 rpm regulator

On Fri 17 Jun 03:22 PDT 2016, Neil Armstrong wrote:

> In order to support eh Qualcomm MDM9615 SoC, add support for the
> PM8018 RPM regulator in the qcom_rpm-regulator driver.
> 
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
[..]
> diff --git a/drivers/regulator/qcom_rpm-regulator.c b/drivers/regulator/qcom_rpm-regulator.c
[..]
> +/**
> + * enum rpm_vreg_voltage_corner - possible voltage corner values
> + *
> + * These should be used in regulator_set_voltage and rpm_vreg_set_voltage calls
> + * for corner type regulators as if they had units of uV.
> + */
> +enum rpm_vreg_voltage_corner {
> +	RPM_VREG_CORNER_NONE = 1,
> +	RPM_VREG_CORNER_LOW,
> +	RPM_VREG_CORNER_NOMINAL,
> +	RPM_VREG_CORNER_HIGH,
> +};
> +
> +static struct regulator_linear_range corner_ranges[] = {
> +	REGULATOR_LINEAR_RANGE(RPM_VREG_CORNER_NONE, 0,
> +				RPM_VREG_CORNER_HIGH, 1),
> +};
> +
>  static int rpm_reg_write(struct qcom_rpm_reg *vreg,
[..]
> +
> +static const struct qcom_rpm_reg pm8018_corner = {
> +	.desc.linear_ranges = corner_ranges,
> +	.desc.n_linear_ranges = ARRAY_SIZE(corner_ranges),
> +	.desc.n_voltages = 4,
> +	.desc.ops = &uV_ops,
> +	.parts = &rpm8018_corner_parts,
> +};
> +
[..]
> +static const struct rpm_regulator_data rpm_pm8018_regulators[] = {
[..]
> +	{ "dig_corner", QCOM_RPM_VOLTAGE_CORNER, &pm8018_corner,
> +						      "vdd_dig_corner" },
> +
> +	{ }
> +};

We have discussed the corners for a long time and I think we've
concluded that they should be exposed as something like an OPP. What we
have agreed on is that they should not be exposed as a regulator with
voltages 1-4uV.

So please drop the corner for now.

Regards,
Bjorn