soc: aspeed: Add UART routing support

Add driver support for the UART routing control. Users can perform
runtime configuration of the RX muxes among the UART controllers and
the UART IO pins.

The sysfs interface is also exported for the convenience of routing paths
check and update.

Signed-off-by: Oskar Senft <osk@google.com>
Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Tested-by: Lei YU <yulei.sh@bytedance.com>
Link: https://lore.kernel.org/r/20210927023053.6728-5-chiawei_wang@aspeedtech.com
Link: https://lore.kernel.org/r/20211022000616.481772-1-joel@jms.id.au'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

soc: aspeed: Add soc info driver

This adds a SOC_BUS info driver for the ASPEED platform.

The full ID table is preserved in this commit message in case someone
finds a need to change the implemntation in the future.

{ "AST1100-A0", 0x00000200 },
{ "AST1100-A1", 0x00000201 },
{ "AST1100-A2", 0x00000202 },
{ "AST1100-A3", 0x00000202 },

{ "AST2050-A0", 0x00000200 },
{ "AST2050-A1", 0x00000201 },
{ "AST2050-A2", 0x00000202 },
{ "AST2050-A3", 0x00000202 },

{ "AST2100-A0", 0x00000300 },
{ "AST2100-A1", 0x00000301 },
{ "AST2100-A2", 0x00000302 },
{ "AST2100-A3", 0x00000302 },

{ "AST2150-A0", 0x00000202 },
{ "AST2150-A1", 0x00000202 },

{ "AST2200-A0", 0x00000102 },
{ "AST2200-A1", 0x00000102 },

{ "AST2300-A0", 0x01000003 },
{ "AST2300-A1", 0x01010303 },

{ "AST1300-A1", 0x01010003 },
{ "AST1050-A1", 0x01010203 },

{ "AST2400-A0", 0x02000303 },
{ "AST2400-A1", 0x02010303 },
{ "AST1400-A1", 0x02010103 },
{ "AST1250-A1", 0x02010303 },

{ "AST2500-A0", 0x04000303 },
{ "AST2510-A0", 0x04000103 },
{ "AST2520-A0", 0x04000203 },
{ "AST2530-A0", 0x04000403 },
{ "AST2500-A1", 0x04010303 },
{ "AST2510-A1", 0x04010103 },
{ "AST2520-A1", 0x04010203 },
{ "AST2530-A1", 0x04010403 },
{ "AST2500-A2", 0x04030303 },
{ "AST2510-A2", 0x04030103 },
{ "AST2520-A2", 0x04030203 },
{ "AST2530-A2", 0x04030403 },

{ "AST2600-A0", 0x05000303 },
{ "AST2600-A1", 0x05010303 },
{ "AST2600-A2", 0x05020303 },
{ "AST2620-A1", 0x05010203 },
{ "AST2620-A2", 0x05020203 },

Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/20200921091644.133107-3-joel@jms.id.au
Signed-off-by: Joel Stanley <joel@jms.id.au>

treewide: Add SPDX license identifier - Makefile/Kconfig

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

soc: add aspeed folder and misc drivers

Create a SoC folder for the ASPEED parts and place the misc drivers
currently present into this folder. These drivers are not generic part
drivers, but rather only apply to the ASPEED SoCs.

Signed-off-by: Patrick Venture <venture@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Olof Johansson <olof@lixom.net>