[1/3] iio: adc: meson-saradc: Disable BL30 integration on G12A and newer SoCs

Commit Message

Martin Blumenstingl July 17, 2021, 11:37 p.m. UTC

G12A and newer don't use the SAR ADC to read the SoC temperature from
within the firmware. Instead there's now a dedicated thermal sensor.
Disable the BL30 integration for G12A and newer SoCs to save a few CPU
cycles when reading samples.
Adding a separate struct meson_sar_adc_data is a good idea anyways
because starting with G12A there's some extra registers to read the
samples in a simplified way.

Signed-off-by: Martin Blumenstingl <[e-mail]>
---
 drivers/iio/adc/meson_saradc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index 66dc452d643a..e140db3e4016 100644
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -1104,6 +1104,14 @@  static const struct meson_sar_adc_param meson_sar_adc_gxl_param = {
 	.resolution = 12,
 };
 
+static const struct meson_sar_adc_param meson_sar_adc_g12a_param = {
+	.has_bl30_integration = false,
+	.clock_rate = 1200000,
+	.bandgap_reg = MESON_SAR_ADC_REG11,
+	.regmap_config = &meson_sar_adc_regmap_config_gxbb,
+	.resolution = 12,
+};
+
 static const struct meson_sar_adc_data meson_sar_adc_meson8_data = {
 	.param = &meson_sar_adc_meson8_param,
 	.name = "meson-meson8-saradc",
@@ -1140,7 +1148,7 @@  static const struct meson_sar_adc_data meson_sar_adc_axg_data = {
 };
 
 static const struct meson_sar_adc_data meson_sar_adc_g12a_data = {
-	.param = &meson_sar_adc_gxl_param,
+	.param = &meson_sar_adc_g12a_param,
 	.name = "meson-g12a-saradc",
 };