I bisected the issue to commit ff00d7a32a1b88b772981a13fc198e0d29300666: "mfd: lpc_ich: Add support for SPI serial flash host controller".
I bisected the issue to commit ff00d7a32a1b88b 772981a13fc198e 0d29300666: "mfd: lpc_ich: Add support for SPI serial flash host controller".