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iio: adc: qcom-spmi-adc5: Update ratios for SMB_* channels for ADC7

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As per the hardware recommendation, add a ratio of 41/40 (i.e.
numerator 40 and denominator 41 based on how it's used in our
calculations) for the ADC channels that use SMB_TEMP pin because
of the voltage divider circuit with a 1 K and 40 K in parallel.

IIN_FB channel should be using the same ratio as that of IIN_SMB
before. Hence, add a separate scaling factor for it.

Change-Id: I4c3d76a068edf7c964a71c5082da54b115e7eb04
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
[quic_subbaram@quicinc.com: Fixed merge conflicts in qcom-spmi-adc5.c
 because common code moved to qcom-vadc-common.c]
Signed-off-by: Subbaraman Narayanamurthy <quic_subbaram@quicinc.com>
[quic_collinsd@quicinc.com: changed prescale "num" and "den"
 to "numerator" and "denominator" respectively]
Signed-off-by: David Collins <quic_collinsd@quicinc.com>
This commit is contained in:
Subbaraman Narayanamurthy 2021-07-14 19:10:20 -07:00 committed by David Collins
parent 6a3569670e
commit fa248b6161
2 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/iio/adc/qcom-spmi-adc5.c
View File

@ -625,17 +625,17 @@ static const struct adc5_channels adc7_chans_pmic[ADC5_MAX_CHANNEL] = {
SCALE_HW_CALIB_DEFAULT)
[ADC7_USB_IN_V_16] = ADC5_CHAN_VOLT("usb_in_v_div_16", 8,
SCALE_HW_CALIB_DEFAULT)
[ADC7_AMUX_THM3] = ADC5_CHAN_TEMP("smb_temp", 0,
[ADC7_AMUX_THM3] = ADC5_CHAN_TEMP("smb_temp", 9,
SCALE_HW_CALIB_PM7_SMB_TEMP)
[ADC7_CHG_TEMP] = ADC5_CHAN_TEMP("chg_temp", 0,
SCALE_HW_CALIB_PM7_CHG_TEMP)
[ADC7_IIN_FB] = ADC5_CHAN_CUR("iin_fb", 9,
[ADC7_IIN_FB] = ADC5_CHAN_CUR("iin_fb", 10,
SCALE_HW_CALIB_CUR)
[ADC7_IIN_SMB] = ADC5_CHAN_CUR("iin_smb", 9,
[ADC7_IIN_SMB] = ADC5_CHAN_CUR("iin_smb", 12,
SCALE_HW_CALIB_CUR)
[ADC7_ICHG_SMB] = ADC5_CHAN_CUR("ichg_smb", 10,
[ADC7_ICHG_SMB] = ADC5_CHAN_CUR("ichg_smb", 13,
SCALE_HW_CALIB_CUR)
[ADC7_ICHG_FB] = ADC5_CHAN_CUR("ichg_fb", 11,
[ADC7_ICHG_FB] = ADC5_CHAN_CUR("ichg_fb", 14,
SCALE_HW_CALIB_CUR_RAW)
[ADC7_DIE_TEMP] = ADC5_CHAN_TEMP("die_temp", 0,
SCALE_HW_CALIB_PMIC_THERM_PM7)

3
drivers/iio/adc/qcom-vadc-common.c
View File

@ -530,9 +530,12 @@ static const struct u32_fract adc5_prescale_ratios[] = {
{ .numerator = 10, .denominator = 81 },
{ .numerator = 1, .denominator = 10 },
{ .numerator = 1, .denominator = 16 },
{ .numerator = 40, .denominator = 41 }, /* PM7_SMB_TEMP */
/* Prescale ratios for current channels below */
{ .numerator = 32, .denominator = 100 }, /* IIN_FB, IIN_SMB */
{ .numerator = 16, .denominator = 100 }, /* ICHG_SMB */
{ .numerator = 1280, .denominator = 4100 }, /* IIN_SMB_new */
{ .numerator = 640, .denominator = 4100 }, /* ICHG_SMB_new */
{ .numerator = 1000, .denominator = 305185 }, /* ICHG_FB */
{ .numerator = 1000, .denominator = 610370 }, /* ICHG_FB_2X */
};