linux-kernel - Re: [PATCH 6/7] iio: adc: sun4i-gpadc-iio: add support for H6 thermal sensor

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Date:   Sun, 5 May 2019 16:25:46 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Yangtao Li <tiny.windzz@...il.com>
Cc:     lee.jones@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        maxime.ripard@...tlin.com, wens@...e.org, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH 6/7] iio: adc: sun4i-gpadc-iio: add support for H6
 thermal sensor

On Fri,  3 May 2019 03:28:12 -0400
Yangtao Li <tiny.windzz@...il.com> wrote:

> This patch adds support for the H6 ths sensor.
> 
> TODO: calibrate thermal sensor by using information from sid.
> 
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
This and the patches before it that I haven't comment on look fine to me.

thanks,

Jonathan
> ---
>  drivers/iio/adc/sun4i-gpadc-iio.c | 65 +++++++++++++++++++++++++++++++
>  include/linux/mfd/sun4i-gpadc.h   |  9 +++++
>  2 files changed, 74 insertions(+)
> 
> diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
> index f24eb76d65c0..9b6fc592f54c 100644
> --- a/drivers/iio/adc/sun4i-gpadc-iio.c
> +++ b/drivers/iio/adc/sun4i-gpadc-iio.c
> @@ -120,6 +120,20 @@ static const struct gpadc_data sun8i_a33_gpadc_data = {
>  	.temp_data_base = SUN4I_GPADC_TEMP_DATA,
>  };
>  
> +static int sun50i_gpadc_disable(struct sun4i_gpadc_iio *info);
> +static int sun50i_gpadc_enable(struct sun4i_gpadc_iio *info);
> +
> +static const struct gpadc_data sun50i_h6_gpadc_data = {
> +	.temp_offset = -2809,
> +	.temp_scale = -67,
> +	.has_bus_clk = true,
> +	.has_bus_rst = true,
> +	.gpadc_enable = sun50i_gpadc_enable,
> +	.gpadc_disable = sun50i_gpadc_disable,
> +	.sensor_count = 2,
> +	.temp_data_base = SUN50I_H6_GPADC_TEMP_DATA,
> +};
> +
>  struct sun4i_sensor_tzd {
>  	struct sun4i_gpadc_iio          *info;
>  	struct thermal_zone_device      *tzd;
> @@ -452,6 +466,53 @@ static int sun4i_gpadc_enable(struct sun4i_gpadc_iio *info)
>  	return 0;
>  }
>  
> +static int sun50i_gpadc_enable(struct sun4i_gpadc_iio *info)
> +{
> +	int ret, val;
> +
> +	ret = reset_control_deassert(info->reset);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_prepare_enable(info->bus_clk);
> +	if (ret)
> +		goto assert_reset;
> +
> +	/*
> +	 * clkin = 24MHz
> +	 * T acquire = clkin / (SUN50I_GPADC_CTRL0_T_ACQ + 1)
> +	 *           = 20us
> +	 */
> +	regmap_write(info->regmap, SUN4I_GPADC_CTRL0,
> +		     SUN50I_GPADC_CTRL0_T_ACQ(479));
> +	/* average over 4 samples */
> +	regmap_write(info->regmap, SUN50I_H6_GPADC_CTRL3,
> +		     SUN4I_GPADC_CTRL3_FILTER_EN |
> +		     SUN4I_GPADC_CTRL3_FILTER_TYPE(1));
> +	/* period = (SUN50I_GPADC_TPR_TEMP_PERIOD + 1) * 4096 / clkin; ~10ms */
> +	regmap_write(info->regmap, SUN50I_GPADC_TPR,
> +		     SUN50I_GPADC_TPR_TEMP_PERIOD(58));
> +	/* TODO: calibrate ths */
> +	/* enable sensor */
> +	val = GENMASK(info->data->sensor_count - 1, 0);
> +	regmap_write(info->regmap, SUN4I_GPADC_CTRL1, val);
> +
> +	return 0;
> +
> +assert_reset:
> +	reset_control_assert(info->reset);
> +
> +	return ret;
> +}
> +
> +static int sun50i_gpadc_disable(struct sun4i_gpadc_iio *info)
> +{
> +	clk_disable_unprepare(info->bus_clk);
> +	reset_control_assert(info->reset);
> +
> +	return 0;
> +}
> +
>  static int sun4i_gpadc_runtime_suspend(struct device *dev)
>  {
>  	struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(dev));
> @@ -546,6 +607,10 @@ static const struct of_device_id sun4i_gpadc_of_id[] = {
>  		.compatible = "allwinner,sun8i-a33-ths",
>  		.data = &sun8i_a33_gpadc_data,
>  	},
> +	{
> +		.compatible = "allwinner,sun50i-h6-ths",
> +		.data = &sun50i_h6_gpadc_data,
> +	},
>  	{ /* sentinel */ }
>  };
>  
> diff --git a/include/linux/mfd/sun4i-gpadc.h b/include/linux/mfd/sun4i-gpadc.h
> index 139872c2e0fe..f505013e9c0d 100644
> --- a/include/linux/mfd/sun4i-gpadc.h
> +++ b/include/linux/mfd/sun4i-gpadc.h
> @@ -19,6 +19,9 @@
>  #define SUN4I_GPADC_CTRL0_FS_DIV(x)			((GENMASK(3, 0) & (x)) << 16)
>  #define SUN4I_GPADC_CTRL0_T_ACQ(x)			(GENMASK(15, 0) & (x))
>  
> +/* TP_CTRL0 bits for sun50i SOCs */
> +#define SUN50I_GPADC_CTRL0_T_ACQ(x)			((GENMASK(15, 0) & (x)) << 16)
> +
>  #define SUN4I_GPADC_CTRL1				0x04
>  
>  #define SUN4I_GPADC_CTRL1_STYLUS_UP_DEBOUNCE(x)		((GENMASK(7, 0) & (x)) << 12)
> @@ -49,6 +52,9 @@
>  #define SUN4I_GPADC_CTRL2_PRE_MEA_EN			BIT(24)
>  #define SUN4I_GPADC_CTRL2_PRE_MEA_THRE_CNT(x)		(GENMASK(23, 0) & (x))
>  
> +#define SUN50I_GPADC_TPR				0x08
> +#define SUN50I_GPADC_TPR_TEMP_PERIOD(x)			((GENMASK(19, 0) & (x)) << 12)
> +
>  #define SUN4I_GPADC_CTRL3				0x0c
>  
>  #define SUN4I_GPADC_CTRL3_FILTER_EN			BIT(2)
> @@ -84,6 +90,9 @@
>  #define SUN4I_GPADC_TEMP_DATA				0x20
>  #define SUN4I_GPADC_DATA				0x24
>  
> +#define SUN50I_H6_GPADC_CTRL3				0x30
> +#define SUN50I_H6_GPADC_TEMP_DATA			0xc0
> +
>  #define SUN4I_GPADC_IRQ_FIFO_DATA			0
>  #define SUN4I_GPADC_IRQ_TEMP_DATA			1
>