diff options
| author | Peter Cai <peter@typeblog.net> | 2022-02-04 15:16:06 -0500 |
|---|---|---|
| committer | Kever Yang <kever.yang@rock-chips.com> | 2022-04-18 11:25:12 +0800 |
| commit | e963228af50d317a83d4ceffb095e40ef3ab9d53 (patch) | |
| tree | ca2829fc042068a782358ef6db75a87e1c7d8d8c /drivers | |
| parent | fdda7901cc77b5bc525263c385cc19f151b6612b (diff) | |
| download | u-boot-e963228af50d317a83d4ceffb095e40ef3ab9d53.tar.gz | |
adc: rockchip-saradc: add support for getting reference voltage value
Mirroring commit 97ab802aa36f ("adc: meson-saradc: add support for
getting reference voltage value") for meson-saradc, this adds support
for getting the "vref-supply" regulator and register it as the ADC's
reference voltage regulator, so clients can translate sampled ADC values
to voltage.
Signed-off-by: Peter Cai <peter@typeblog.net>
Reviewed-by: John Keeping <john@metanate.com>
Tested-by: John Keeping <john@metanate.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Philipp Tomsich <philipp.tomsich@vrull.eu>
Cc: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/adc/rockchip-saradc.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/adc/rockchip-saradc.c b/drivers/adc/rockchip-saradc.c index e0cbab6aa0..760f8fe628 100644 --- a/drivers/adc/rockchip-saradc.c +++ b/drivers/adc/rockchip-saradc.c @@ -13,6 +13,7 @@ #include <asm/io.h> #include <linux/bitops.h> #include <linux/err.h> +#include <power/regulator.h> #define SARADC_CTRL_CHN_MASK GENMASK(2, 0) #define SARADC_CTRL_POWER_CTRL BIT(3) @@ -100,8 +101,11 @@ int rockchip_saradc_stop(struct udevice *dev) int rockchip_saradc_probe(struct udevice *dev) { + struct adc_uclass_plat *uc_pdata = dev_get_uclass_plat(dev); struct rockchip_saradc_priv *priv = dev_get_priv(dev); + struct udevice *vref; struct clk clk; + int vref_uv; int ret; ret = clk_get_by_index(dev, 0, &clk); @@ -114,6 +118,23 @@ int rockchip_saradc_probe(struct udevice *dev) priv->active_channel = -1; + ret = device_get_supply_regulator(dev, "vref-supply", &vref); + if (ret) { + printf("can't get vref-supply: %d\n", ret); + return ret; + } + + vref_uv = regulator_get_value(vref); + if (vref_uv < 0) { + printf("can't get vref-supply value: %d\n", vref_uv); + return vref_uv; + } + + /* VDD supplied by common vref pin */ + uc_pdata->vdd_supply = vref; + uc_pdata->vdd_microvolts = vref_uv; + uc_pdata->vss_microvolts = 0; + return 0; } |