thermal: generic-adc: make lookup table optional (d36e2fa0) · Commits · 戴 / test

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>

drivers/thermal/thermal-generic-adc.c

+6 −3

Original line number	Diff line number	Diff line
		@@ -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) {

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