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thermal: generic-adc: make lookup table optional

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Certain ADC channels, such as the xilinx-ams temperature channels, give
milliCelcius already when read with iio_read_channel_processed.

Rather than having to provide a 1:1 dummy lookup table, simply allow to
bypass the mechanism.

Signed-off-by: Jean-Francois Dagenais <jeff.dagenais@gmail.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Jean-Francois Dagenais 2019-04-18 12:37:32 -04:00 committed by Eduardo Valentin
parent f86a7a847c
commit d36e2fa025
1 changed files with 6 additions and 3 deletions
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9
drivers/thermal/thermal-generic-adc.c
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@ -29,6 +29,9 @@ static int gadc_thermal_adc_to_temp(struct gadc_thermal_info *gti, int val)
int temp, temp_hi, temp_lo, adc_hi, adc_lo;
int i;
if (!gti->lookup_table)
return val;
for (i = 0; i < gti->nlookup_table; i++) {
if (val >= gti->lookup_table[2 * i + 1])
break;
@ -81,9 +84,9 @@ static int gadc_thermal_read_linear_lookup_table(struct device *dev,
ntable = of_property_count_elems_of_size(np, "temperature-lookup-table",
sizeof(u32));
if (ntable < 0) {
dev_err(dev, "Lookup table is not provided\n");
return ntable;
if (ntable <= 0) {
dev_notice(dev, "no lookup table, assuming DAC channel returns milliCelcius\n");
return 0;
}
if (ntable % 2) {