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iio/adc: ingenic: add JZ4760B support to the sadc driver 

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>
Link: https://lore.kernel.org/r/20210726082033.351533-5-cbranchereau@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Christophe Branchereau 2021-07-26 10:20:32 +02:00 committed by Jonathan Cameron
parent b9e9bdd425
commit bf1b2418c2
1 changed files with 10 additions and 0 deletions
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10
drivers/iio/adc/ingenic-adc.c
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@ -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, },
{ },
};