sfc: SFN4111T: Fix GPIO sharing between I2C and FLASH_CFG_1
Change sfn4111t_reset() to change only GPIO output enables so that it doesn't break subsequent I2C operations. Update comments to explain exactly what we're doing. Add a short sleep to make sure the FLASH_CFG_1 value is latched before any subsequent I2C operations. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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