The following devices have a Winbond W25Q256FV flash chip,
which does not have the RESET pin enabled by default,
and otherwise would require setting a bit in a status register.
Before moving to Linux 5.4, we had the patch:
0053-mtd-spi-nor-add-w25q256-3b-mode-switch.patch
which kept specific flash chips with explicit 3-byte and 4-byte address modes
to stay in 3-byte address mode while idle (after an erase or write)
by using a custom flag SPI_NOR_4B_READ_OP that was part of the patch.
this was obsoleted by the patch:
481-mtd-spi-nor-rework-broken-flash-reset-support.patch
which uses the newer upstream flag SNOR_F_BROKEN_RESET
for devices with a flash chip that cannot be hardware reset with RESET pin
and therefore must be left in 3-byte address mode when idle.
The new patch requires that the DTS of affected devices
have the property "broken-flash-reset", which was not yet added for most of them.
This commit adds the property for remaining affected devices in ramips target,
specifically because of the flash chip model.
However, it is possible that there are other devices
where the flash chip uses an explicit 4-byte address mode
and the RESET pin is not connected to the SOC on the board,
and those DTS would also need this property.
Ref: 22d982ea00 ("ramips: add support for switching between 3-byte and 4-byte addressing")
Ref: dfa521f129 ("generic: spi-nor: rework broken-flash-reset")
Signed-off-by: Michael Pratt <mcpratt@pm.me>
Device specifications:
* Model: Youku YK-L1/L1c
* CPU: MT7620A
* RAM: 128 MiB
* Flash: 32 MiB (YK-L1)/ 16 MiB (YK-L1c)
* LAN: 2* 10M/100M Ports
* WAN: 1* 10M/100M Port
* USB: 1* USB2.0
* SD: 1* MicroSD socket
* UART: 1* TTL, Baudrate 57600
Descriptions:
Previous supported device YOUKU yk1 is actually Youku YK-L1. Though they look
really different, the only hardware difference between the two models is flash
size, YK-L1 has 32 MiB flash but YK-L1c has 16MiB. It seems that YK-L1c can
compatible with YK-L1's firmware but it's better to split it to different models.
It is easy to identify the models by looking at the label on the bottom of the
device. The label has the model number "YK-L1" or "YK-L1c". Due to different flash
sizes, YK-L1c that using previous YK-L1's firmware needs to apply "force update"
to install compatible firmware, so please backup config file before system upgrade.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
[use more specific name for DTSI]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
