[PATCH v3 4/5] iio/adc: ingenic: add JZ4760B support to the sadc driver
From: Christophe Branchereau <hidden>
Date: 2021-07-24 19:05:48
Also in:
linux-iio, linux-mips, lkml
Subsystem:
iio subsystem and drivers, ingenic jz47xx socs, the rest · Maintainers:
Jonathan Cameron, Paul Cercueil, Linus Torvalds
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 <redacted> --- drivers/iio/adc/ingenic-adc.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c
index 6b9af0530590..eaa8ab36183c 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);
--
2.30.2