spi: ich: Lock down controller settings if required
authorBin Meng <bmeng.cn@gmail.com>
Thu, 19 Oct 2017 01:20:57 +0000 (18:20 -0700)
committerBin Meng <bmeng.cn@gmail.com>
Fri, 27 Oct 2017 07:13:47 +0000 (15:13 +0800)
commitab20107468de5bf6b9affa93b17f2284cc838b5b
treeaaa3c18ef2f5c903fa534da2069ed281f0c079b0
parentfb2c53091ff457ce8a0b547f37e7374d10d855ea
spi: ich: Lock down controller settings if required

Some Intel FSP (like Braswell) does SPI lock-down during the call
to fsp_notify(INIT_PHASE_BOOT). But before SPI lock-down is done,
it's bootloader's responsibility to configure the SPI controller's
opcode registers properly otherwise SPI controller driver doesn't
know how to communicate with the SPI flash device.

Rather than passively doing the opcode configuration, let's add a
simple DTS property "intel,spi-lock-down" and let the driver call
the opcode configuration function if required by such FSP.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
drivers/spi/ich.c
drivers/spi/ich.h