linux-kernel - [PATCH v3 22/30] iio: adc: sun4i-gpadc-iio: add support for A83T thermal sensor

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Date:   Thu, 30 Aug 2018 17:45:10 +0200
From:   Philipp Rossak <embed3d@...il.com>
To:     lee.jones@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        maxime.ripard@...tlin.com, wens@...e.org, linux@...linux.org.uk,
        jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, eugen.hristev@...rochip.com,
        rdunlap@...radead.org, vilhelm.gray@...il.com,
        clabbe.montjoie@...il.com, quentin.schulz@...tlin.com,
        geert+renesas@...der.be, lukas@...ner.de, icenowy@...c.io,
        arnd@...db.de, broonie@...nel.org, arnaud.pouliquen@...com
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: [PATCH v3 22/30] iio: adc: sun4i-gpadc-iio: add support for A83T thermal sensor

This patch adds support for the A83T ths sensor.

The A83T supports interrupts. The interrupt is configured to update the
the sensor values every second.

Signed-off-by: Philipp Rossak <embed3d@...il.com>
---
 drivers/iio/adc/sun4i-gpadc-iio.c   | 59 +++++++++++++++++++++++++++++++++++++
 include/linux/iio/adc/sun4i-gpadc.h |  6 ++++
 2 files changed, 65 insertions(+)

diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
index d5c7971b2558..a184a87c56d4 100644
--- a/drivers/iio/adc/sun4i-gpadc-iio.c
+++ b/drivers/iio/adc/sun4i-gpadc-iio.c
@@ -84,6 +84,8 @@ static int sun8i_h3_ths_resume(struct sun4i_gpadc_iio *info);
 static int sun8i_h3_ths_suspend(struct sun4i_gpadc_iio *info);
 static irqreturn_t sunx8i_h3_irq_thread(int irq, void *data);
 
+static int sun8i_a83t_ths_resume(struct sun4i_gpadc_iio *info);
+
 static const struct gpadc_data sun4i_gpadc_data = {
 	.temp_offset = -1932,
 	.temp_scale = 133,
@@ -158,6 +160,21 @@ static const struct gpadc_data sun8i_h3_ths_data = {
 	.ths_irq_clear = SUN8I_H3_THS_INTS_TDATA_IRQ_0,
 };
 
+static const struct gpadc_data sun8i_a83t_ths_data = {
+	.temp_offset = -2724,
+	.temp_scale = -70,
+	.temp_data_base = SUN8I_H3_THS_TDATA0,
+	.ths_irq_thread = sunx8i_h3_irq_thread,
+	.support_irq = true,
+	.sensor_count = 3,
+	.supports_nvmem = true,
+	.ths_resume = sun8i_a83t_ths_resume,
+	.ths_suspend = sun8i_h3_ths_suspend,
+	.ths_irq_clear = SUN8I_H3_THS_INTS_TDATA_IRQ_0 |
+			SUN8I_A83T_THS_INTS_TDATA_IRQ_1 |
+			SUN8I_A83T_THS_INTS_TDATA_IRQ_2,
+};
+
 struct sun4i_sensor_tzd {
 	struct sun4i_gpadc_iio		*info;
 	struct thermal_zone_device	*tzd;
@@ -541,6 +558,44 @@ static int sun8i_h3_ths_resume(struct sun4i_gpadc_iio *info)
 	return 0;
 }
 
+static int sun8i_a83t_ths_resume(struct sun4i_gpadc_iio *info)
+{
+	u32 value;
+
+	sun8i_h3_calibrate(info);
+
+	regmap_write(info->regmap, SUN8I_H3_THS_CTRL0,
+			SUN4I_GPADC_CTRL0_T_ACQ(0x13f));
+
+	regmap_write(info->regmap, SUN8I_H3_THS_CTRL2,
+			SUN8I_H3_THS_ACQ1(0x13f));
+
+	regmap_write(info->regmap, SUN8I_H3_THS_STAT,
+			SUN8I_H3_THS_INTS_TDATA_IRQ_0   |
+			SUN8I_A83T_THS_INTS_TDATA_IRQ_1 |
+			SUN8I_A83T_THS_INTS_TDATA_IRQ_2);
+
+	regmap_write(info->regmap, SUN8I_H3_THS_FILTER,
+			SUN4I_GPADC_CTRL3_FILTER_EN |
+			SUN4I_GPADC_CTRL3_FILTER_TYPE(0x2));
+
+	regmap_write(info->regmap, SUN8I_H3_THS_INTC,
+			SUN8I_H3_THS_INTC_TDATA_IRQ_EN0 |
+			SUN8I_A83T_THS_INTC_TDATA_IRQ_EN1 |
+			SUN8I_A83T_THS_INTC_TDATA_IRQ_EN2 |
+			SUN8I_H3_THS_TEMP_PERIOD(0x257));
+
+	regmap_read(info->regmap, SUN8I_H3_THS_CTRL2, &value);
+
+	regmap_write(info->regmap, SUN8I_H3_THS_CTRL2,
+			SUN8I_H3_THS_TEMP_SENSE_EN0   |
+			SUN8I_A83T_THS_TEMP_SENSE_EN1 |
+			SUN8I_A83T_THS_TEMP_SENSE_EN2 |
+			value);
+
+	return 0;
+}
+
 static int sun4i_gpadc_get_temp(void *data, int *temp)
 {
 	struct sun4i_sensor_tzd *tzd = data;
@@ -588,6 +643,10 @@ static const struct of_device_id sun4i_gpadc_of_id[] = {
 		.compatible = "allwinner,sun8i-h3-ths",
 		.data = &sun8i_h3_ths_data,
 	},
+	{
+		.compatible = "allwinner,sun8i-a83t-ths",
+		.data = &sun8i_a83t_ths_data,
+	},
 	{ /* sentinel */ }
 };
 
diff --git a/include/linux/iio/adc/sun4i-gpadc.h b/include/linux/iio/adc/sun4i-gpadc.h
index 169b4de9a34d..673459bb3ec3 100644
--- a/include/linux/iio/adc/sun4i-gpadc.h
+++ b/include/linux/iio/adc/sun4i-gpadc.h
@@ -105,13 +105,19 @@
 #define SUN8I_H3_THS_CTRL2				0x40
 #define SUN8I_H3_THS_ACQ1(x)			(GENMASK(31, 16) & ((x) << 16))
 #define SUN8I_H3_THS_TEMP_SENSE_EN0			BIT(0)
+#define SUN8I_A83T_THS_TEMP_SENSE_EN1			BIT(1)
+#define SUN8I_A83T_THS_TEMP_SENSE_EN2			BIT(2)
 
 #define SUN8I_H3_THS_INTC				0x44
 #define SUN8I_H3_THS_TEMP_PERIOD(x)		(GENMASK(31, 12) & ((x) << 12))
 #define SUN8I_H3_THS_INTC_TDATA_IRQ_EN0			BIT(8)
+#define SUN8I_A83T_THS_INTC_TDATA_IRQ_EN1		BIT(9)
+#define SUN8I_A83T_THS_INTC_TDATA_IRQ_EN2		BIT(10)
 
 #define SUN8I_H3_THS_STAT				0x48
 #define SUN8I_H3_THS_INTS_TDATA_IRQ_0			BIT(8)
+#define SUN8I_A83T_THS_INTS_TDATA_IRQ_1			BIT(9)
+#define SUN8I_A83T_THS_INTS_TDATA_IRQ_2			BIT(10)
 
 #define SUN8I_H3_THS_FILTER				0x70
 #define SUNXI_THS_CDATA_0_1				0x74
-- 
2.11.0