diff mbox series

[v4,4/5] iio/adc: ingenic: add JZ4760B support to the sadc driver

Message ID 20210726082033.351533-5-cbranchereau@gmail.com (mailing list archive)
State Accepted
Headers show
Series iio/adc: ingenic: add support for the JZ4760(B) Socs to the ingenic sadc driver | expand

Commit Message

Christophe Branchereau July 26, 2021, 8:20 a.m. UTC
The JZ4760B variant differs slightly from the JZ4760: it has a bit called VBAT_SEL in the CFG register.

In order to correctly sample the battery voltage on existing handhelds using this SOC, the bit must be cleared.

We leave the possibility to set the bit, by using the "ingenic,use-internal-divider" in the devicetree.

Signed-off-by: Christophe Branchereau <cbranchereau@gmail.com>
---
 drivers/iio/adc/ingenic-adc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c
index 6b9af0530590..2b3912c6ca6b 100644
--- a/drivers/iio/adc/ingenic-adc.c
+++ b/drivers/iio/adc/ingenic-adc.c
@@ -37,6 +37,7 @@ 
 #define JZ_ADC_REG_CFG_SAMPLE_NUM(n)	((n) << 10)
 #define JZ_ADC_REG_CFG_PULL_UP(n)	((n) << 16)
 #define JZ_ADC_REG_CFG_CMD_SEL		BIT(22)
+#define JZ_ADC_REG_CFG_VBAT_SEL		BIT(30)
 #define JZ_ADC_REG_CFG_TOUCH_OPS_MASK	(BIT(31) | GENMASK(23, 10))
 #define JZ_ADC_REG_ADCLK_CLKDIV_LSB	0
 #define JZ4725B_ADC_REG_ADCLK_CLKDIV10US_LSB	16
@@ -879,6 +880,14 @@  static int ingenic_adc_probe(struct platform_device *pdev)
 	/* Put hardware in a known passive state. */
 	writeb(0x00, adc->base + JZ_ADC_REG_ENABLE);
 	writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
+
+	/* JZ4760B specific */
+	if (device_property_present(dev, "ingenic,use-internal-divider"))
+		ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_VBAT_SEL,
+					    JZ_ADC_REG_CFG_VBAT_SEL);
+	else
+		ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_VBAT_SEL, 0);
+
 	usleep_range(2000, 3000); /* Must wait at least 2ms. */
 	clk_disable(adc->clk);
 
@@ -906,6 +915,7 @@  static const struct of_device_id ingenic_adc_of_match[] = {
 	{ .compatible = "ingenic,jz4725b-adc", .data = &jz4725b_adc_soc_data, },
 	{ .compatible = "ingenic,jz4740-adc", .data = &jz4740_adc_soc_data, },
 	{ .compatible = "ingenic,jz4760-adc", .data = &jz4760_adc_soc_data, },
+	{ .compatible = "ingenic,jz4760b-adc", .data = &jz4760_adc_soc_data, },
 	{ .compatible = "ingenic,jz4770-adc", .data = &jz4770_adc_soc_data, },
 	{ },
 };