kernel: reset the ADC chip

It is good practice to reset thing Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

kernel: reset the ADC chip
It is good practice to reset thing Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
c7f8d72e · Federico Vaga · 359ded65 · c7f8d72e
Commit c7f8d72e authored Feb 13, 2018 by Federico Vaga
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spi.c kernel/spi.c +4 -0

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--- a/kernel/spi.c
+++ b/kernel/spi.c
@@ -81,6 +81,10 @@ int fa_spi_init(struct fa_dev *fa)
 	/* Divider must be 100, according to firmware guide */
 	fa_iowrite(fa, 100, fa->fa_spi_base + FA_SPI_DIV);

+	/* software reset the ADC chip (register 0) */
+	fa_spi_xfer(fa, FA_SPI_SS_ADC, 16,  BIT(8), &rx);
+	msleep(5);
+
 	/* Force 2's complement data output (register 1, bit 5) */
 	fa_spi_xfer(fa, FA_SPI_SS_ADC, 16, (1 << 8) | (1 << 5), &rx);