tree 6c59b8286b7b23a5841559c6d97ab1c68db43780
parent d2cdf5dc58f6970e9d9d26e47974c21fe87983f3
author Andrew Jeffery <andrew@aj.id.au> 1478097476 +1030
committer Linus Walleij <linus.walleij@linaro.org> 1478511093 +0100

pinctrl-aspeed-g5: Never set SCU90[6]

If a pin depending on bit 6 in SCU90 is requested for GPIO, the export
will succeed but changes to the GPIO's value will not be accepted by the
hardware. This is because the pinmux driver has misconfigured the SCU by
writing 1 to the reserved bit.

The description of SCU90[6] from the datasheet is 'Reserved, must keep
at value ”0”'. The fix is to switch pinmux from the bit-flipping macro
to explicitly configuring the .enable and .disable values to zero.

The patch has been tested on an AST2500 EVB.

Fixes: 56e57cb6c07f (pinctrl: Add pinctrl-aspeed-g5 driver)
Reported-by: Uma Yadlapati <yadlapat@us.ibm.com>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>