Introduce SMP support for CI20 (based on JZ4780) v6.

Subject: Introduce SMP support for CI20 (based on JZ4780) v6.
From: 周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx>
Date: Fri, 21 Feb 2020 00:24:41 +0800
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-clk@xxxxxxxxxxxxxxx, devicetree@xxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, ralf@xxxxxxxxxxxxxx, paulburton@xxxxxxxxxx, jiaxun.yang@xxxxxxxxxxx, chenhc@xxxxxxxxxx, sboyd@xxxxxxxxxx, mturquette@xxxxxxxxxxxx, mark.rutland@xxxxxxx, robh+dt@xxxxxxxxxx, daniel.lezcano@xxxxxxxxxx, paul@xxxxxxxxxxxxxxx, geert+renesas@xxxxxxxxx, krzk@xxxxxxxxxx, ebiederm@xxxxxxxxxxxx, miquel.raynal@xxxxxxxxxxx, keescook@xxxxxxxxxxxx, sernia.zhou@xxxxxxxxxxx, zhenwenjin@xxxxxxxxx, dongsheng.qiu@xxxxxxxxxxx

Introduce SMP support for MIPS Creator CI20, which is
based on Ingenic JZ4780 SoC.

Follow-Ups:
- [PATCH v6 6/7] MIPS: Ingenic: Add 'cpus' node for Ingenic SoCs.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v6 0/7] Introduce SMP support for CI20 (based on JZ4780).
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v6 5/7] dt-bindings: MIPS: Document Ingenic SoCs binding.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v6 1/7] clk: JZ4780: Add function for enable the second core.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v6 2/7] MIPS: JZ4780: Introduce SMP support.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v6 7/7] MIPS: CI20: Update defconfig to support SMP.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v6 3/7] MIPS: CI20: Modify DTS to support high resolution timer for SMP.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v6 4/7] clocksource: Ingenic: Add high resolution timer support for SMP.
  - From: 周琰杰 (Zhou Yanjie)