hwmon: (da9052) Increase sample rate when using TSI

The TSI channel, which is usually used for touchscreen support, but can
be used as 4 general purpose ADCs. When used as a touchscreen interface
the touchscreen driver switches the device into 1ms sampling mode (rather
than the default 10ms economy mode) as recommended by the manufacturer.
When using the TSI channels as a general purpose ADC we are currently not
doing this and testing suggests that this can result in ADC timeouts:

[ 5827.198289] da9052 spi2.0: timeout waiting for ADC conversion interrupt
[ 5827.728293] da9052 spi2.0: timeout waiting for ADC conversion interrupt
[ 5993.808335] da9052 spi2.0: timeout waiting for ADC conversion interrupt
[ 5994.328441] da9052 spi2.0: timeout waiting for ADC conversion interrupt
[ 5994.848291] da9052 spi2.0: timeout waiting for ADC conversion interrupt

Switching to the 1ms timing resolves this issue.

Fixes: 4f16cab1 ("hwmon: da9052: Add support for TSI channel")
Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Acked-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/da9052-hwmon.c

@@ -477,6 +477,11 @@ static int da9052_hwmon_probe(struct platform_device *pdev)
 		/* disable touchscreen features */
 		da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
 
+		/* Sample every 1ms */
+		da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG,
+					  DA9052_ADCCONT_ADCMODE,
+					  DA9052_ADCCONT_ADCMODE);
+
 		err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
 					 "tsiready-irq", da9052_tsi_datardy_irq,
 					 hwmon);