linux-kernel - Re: [PATCH v3 2/3] regulator: mt6358: Add output voltage fine tuning to fixed regulators

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Message-ID: <20230921103050.GA3449785@google.com>
Date:   Thu, 21 Sep 2023 11:30:50 +0100
From:   Lee Jones <lee@...nel.org>
To:     Chen-Yu Tsai <wenst@...omium.org>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Mark Brown <broonie@...nel.org>,
        Zhiyong Tao <zhiyong.tao@...iatek.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 2/3] regulator: mt6358: Add output voltage fine tuning
 to fixed regulators

On Wed, 13 Sep 2023, Chen-Yu Tsai wrote:

> The "fixed" LDO regulators found on the MT6358 and MT6366 PMICs have
> either no voltage selection register, or only one valid setting.
> However these do have a fine voltage calibration setting that can
> slightly boost the output voltage from 0 mV to 100 mV, in 10 mV
> increments.
> 
> Add support for this by changing these into linear range regulators.
> Some register definitions that are missing are also added.
> 
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
> This patch needs an ack from Lee.
> 
>  drivers/regulator/mt6358-regulator.c | 15 +++++++++++++--

>  include/linux/mfd/mt6358/registers.h |  6 ++++++

Acked-by: Lee Jones <lee@...nel.org>

>  2 files changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/regulator/mt6358-regulator.c b/drivers/regulator/mt6358-regulator.c
> index 935c7ad56c7e..ecb2cd1eb34f 100644
> --- a/drivers/regulator/mt6358-regulator.c
> +++ b/drivers/regulator/mt6358-regulator.c
> @@ -123,10 +123,13 @@ struct mt6358_regulator_info {
>  		.type = REGULATOR_VOLTAGE,	\
>  		.id = MT6358_ID_##vreg,	\
>  		.owner = THIS_MODULE,	\
> -		.n_voltages = 1,	\
> +		.n_voltages = 11,	\
> +		.vsel_reg = MT6358_##vreg##_ANA_CON0,	\
> +		.vsel_mask = GENMASK(3, 0),	\
>  		.enable_reg = enreg,	\
>  		.enable_mask = BIT(enbit),	\
>  		.min_uV = volt,	\
> +		.uV_step = 10000, \
>  	},	\
>  	.status_reg = MT6358_LDO_##vreg##_CON1,	\
>  	.qi = BIT(15),							\
> @@ -219,10 +222,13 @@ struct mt6358_regulator_info {
>  		.type = REGULATOR_VOLTAGE,	\
>  		.id = MT6366_ID_##vreg,	\
>  		.owner = THIS_MODULE,	\
> -		.n_voltages = 1,	\
> +		.n_voltages = 11,	\
> +		.vsel_reg = MT6358_##vreg##_ANA_CON0,	\
> +		.vsel_mask = GENMASK(3, 0),	\
>  		.enable_reg = enreg,	\
>  		.enable_mask = BIT(enbit),	\
>  		.min_uV = volt,	\
> +		.uV_step = 10000, \
>  	},	\
>  	.status_reg = MT6358_LDO_##vreg##_CON1,	\
>  	.qi = BIT(15),							\
> @@ -482,8 +488,13 @@ static const struct regulator_ops mt6358_volt_table_ops = {
>  	.get_status = mt6358_get_status,
>  };
>  
> +/* "Fixed" LDOs with output voltage calibration +0 ~ +10 mV */
>  static const struct regulator_ops mt6358_volt_fixed_ops = {
>  	.list_voltage = regulator_list_voltage_linear,
> +	.map_voltage = regulator_map_voltage_linear,
> +	.set_voltage_sel = regulator_set_voltage_sel_regmap,
> +	.get_voltage_sel = mt6358_get_buck_voltage_sel,
> +	.set_voltage_time_sel = regulator_set_voltage_time_sel,
>  	.enable = regulator_enable_regmap,
>  	.disable = regulator_disable_regmap,
>  	.is_enabled = regulator_is_enabled_regmap,
> diff --git a/include/linux/mfd/mt6358/registers.h b/include/linux/mfd/mt6358/registers.h
> index 3d33517f178c..5ea2590be710 100644
> --- a/include/linux/mfd/mt6358/registers.h
> +++ b/include/linux/mfd/mt6358/registers.h
> @@ -262,6 +262,12 @@
>  #define MT6358_LDO_VBIF28_CON3                0x1db0
>  #define MT6358_VCAMA1_ANA_CON0                0x1e08
>  #define MT6358_VCAMA2_ANA_CON0                0x1e0c
> +#define MT6358_VFE28_ANA_CON0                 0x1e10
> +#define MT6358_VCN28_ANA_CON0                 0x1e14
> +#define MT6358_VBIF28_ANA_CON0                0x1e18
> +#define MT6358_VAUD28_ANA_CON0                0x1e1c
> +#define MT6358_VAUX18_ANA_CON0                0x1e20
> +#define MT6358_VXO22_ANA_CON0                 0x1e24
>  #define MT6358_VCN33_ANA_CON0                 0x1e28
>  #define MT6358_VSIM1_ANA_CON0                 0x1e2c
>  #define MT6358_VSIM2_ANA_CON0                 0x1e30
> -- 
> 2.42.0.283.g2d96d420d3-goog
> 

-- 
Lee Jones [李琼斯]