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mfd: AB8500 mask off irrelevant bits from the SPI message

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The registers on the AB8500 are only 8 bits wide, so the content
of the remaining bits is undefined. Let's mask off the undefined
stuff when returning a register in an SPI read.

Acked-by: Rabin Vincent <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Samuel Ortiz <[email protected]>
This commit is contained in:
Linus Walleij 2010-05-28 02:59:44 +02:00 • committed by Samuel Ortiz
commit c0d4010e11
1 changed files with 6 additions and 1 deletions
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7
drivers/mfd/ab8500-spi.c
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@ -68,7 +68,12 @@ static int ab8500_spi_read(struct ab8500 *ab8500, u16 addr)
ret = spi_sync(spi, &msg);
if (!ret)
ret = ab8500->rx_buf[0];
/*
* Only the 8 lowermost bytes are
* defined with value, the rest may
* vary depending on chip/board noise.
*/
ret = ab8500->rx_buf[0] & 0xFFU;
return ret;
}