* RockPI-S board has no video I/O
* udev rule to fix MAC address of iface based on UUID
Deals with WiFi chip lacking any EEPROM to store its unique Ethernet MAC address
Generic mechanism -- could be utilized for other boards having similar issues
* Handy Device Tree overlays for the RockPI S
Use armbian-add-overlay to install these
Reduce CPU voltage for the RK3308 B-S
Option to overclock RK3308 B-S to 1.3Ghz
Increase SDIO clock rate from 1Mhz to 10Mhz
This increases WiFi throughput from 300K bytes/s to 2.4M bytes/s
* corrected comment
* No longer repeat standard opp's in this dts
Require that the standard bs dts already be installed
* User README for adding RockPI-S board variant specific dts overlays
* "enabled" --> "okay"
* added mention of sdnand.dts, fixed typo
* added p2p0 to interfaces whose MAC address should be "fixed"
* RK3308 CPU serial number in nvmem replaces UUID for derivation of fixed MAC addr
Restored use of install utility
* Use RK3308 specific CPU serial number
rather than rootfs UUID
* remove generic fixMACaddress
* Install fixMACaddr file-by-file via install utility
* Drive SDIO bus signals faster
setting RK3308_SOC_CON0_VCCIO3 reduces signal rise/fall times to WiFi SDIO chip
from 30ns to 5ns.
This odd fix forward ported from legacy kernel.
Allows Rock Pi-S WiFi to operate at full speed.
* Set RK3308 I/O voltage domains before SDIO initializes
This patch moves responibility form the io-domain to the pinctrl driver because
the io-domain driver is probed after the SDIO devices are discovered.
This was causing multiple SDIO I/O failures during boot.
A new pinctrl property is added:
io-1v8-domains
is a u32 interpreted as a bit mask where each set bit corresponds to
a 1.8V I/O domain (as opposed to the default of 3.3V for I/O)
The mask is writted to the RK3308_SOC_CON0 GRF register
(once) when the pinctrl driver starts
The default mask is 0x10 where only I/O domain 4 runs at 1.8V
This is necessary for the RockPI-S to run the SDIO clock at high (50Mhz) speed
* align whitespace
* factored rk3308bs overlays out up sdio speedup patch
* factored dts for RK3308 iodomains and pinctrl patches out of speedup patch
* remains of sdio speedup patch merely add iodomains support for rk3308
* factored rockpis dts modification out from rk3308 io voltage domains
replaced rk3308 support from iodomains with
new io-voltage-domains property added to pinctrl
io-voltage-domains specific to rk3308 for now, others SOCs may be added later.
* add sequence numbering to names of rk3308 patches
* corrected tab alignment
