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From:   Anup Patel <anup.patel@wdc.com>
To:     Palmer Dabbelt <palmer@dabbelt.com>,
        Palmer Dabbelt <palmerdabbelt@google.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        Pavel Machek <pavel@ucw.cz>, Rob Herring <robh+dt@kernel.org>
Cc:     Sandeep Tripathy <milun.tripathy@gmail.com>,
        Atish Patra <atish.patra@wdc.com>,
        Alistair Francis <Alistair.Francis@wdc.com>,
        Liush <liush@allwinnertech.com>,
        Anup Patel <anup@brainfault.org>, devicetree@vger.kernel.org,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Anup Patel <anup.patel@wdc.com>
Subject: [RFC PATCH v4 0/8] RISC-V CPU Idle Support
Date:   Mon, 17 May 2021 18:38:15 +0530
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This series adds RISC-V CPU Idle support using SBI HSM suspend function.
The RISC-V SBI CPU idle driver added by this series is highly inspired
from the ARM PSCI CPU idle driver.

At high-level, this series includes the following changes:
1) Preparatory arch/riscv patches (Patches 1 to 3)
2) Defines for RISC-V SBI HSM suspend (Patch 4)
3) Preparatory patch to share code between RISC-V SBI CPU idle driver
   and ARM PSCI CPU idle driver (Patch 5)
4) RISC-V SBI CPU idle driver and related DT bindings (Patches 6 to 7)

These patches can be found in riscv_sbi_hsm_suspend_v4 branch at
https://github.com/avpatel/linux

Special thanks Sandeep Tripathy for providing early feeback on SBI HSM
support in all above projects (RISC-V SBI specification, OpenSBI, and
Linux RISC-V).

Changes since v3:
 - Rebased on Linux-5.13-rc2
 - Fixed __cpu_resume_enter() which was broken due to XIP kernel support
 - Removed "struct dt_idle_genpd_ops" abstraction which simplifies code
   sharing between ARM PSCI and RISC-V SBI drivers in PATCH5

Changes since v2:
 - Rebased on Linux-5.12-rc3
 - Updated PATCH7 to add common DT bindings for both ARM and RISC-V
   idle states
 - Added "additionalProperties = false" for both idle-states node and
   child nodes in PATCH7

Changes since v1:
 - Fixex minor typo in PATCH1
 - Use just "idle-states" as DT node name for CPU idle states
 - Added documentation for "cpu-idle-states" DT property in
   devicetree/bindings/riscv/cpus.yaml
 - Added documentation for "riscv,sbi-suspend-param" DT property in
   devicetree/bindings/riscv/idle-states.yaml

Anup Patel (8):
  RISC-V: Enable CPU_IDLE drivers
  RISC-V: Rename relocate() and make it global
  RISC-V: Add arch functions for non-retentive suspend entry/exit
  RISC-V: Add SBI HSM suspend related defines
  cpuidle: Factor-out power domain related code from PSCI domain driver
  cpuidle: Add RISC-V SBI CPU idle driver
  dt-bindings: Add common bindings for ARM and RISC-V idle states
  RISC-V: Enable RISC-V SBI CPU Idle driver for QEMU virt machine

 .../bindings/{arm => cpu}/idle-states.yaml    | 228 ++++++-
 .../devicetree/bindings/riscv/cpus.yaml       |   6 +
 MAINTAINERS                                   |   7 +
 arch/riscv/Kconfig                            |   7 +
 arch/riscv/Kconfig.socs                       |   3 +
 arch/riscv/configs/defconfig                  |  13 +-
 arch/riscv/configs/rv32_defconfig             |   6 +-
 arch/riscv/include/asm/asm.h                  |  17 +
 arch/riscv/include/asm/cpuidle.h              |  24 +
 arch/riscv/include/asm/sbi.h                  |  27 +-
 arch/riscv/include/asm/suspend.h              |  35 +
 arch/riscv/kernel/Makefile                    |   2 +
 arch/riscv/kernel/asm-offsets.c               |   3 +
 arch/riscv/kernel/cpu_ops_sbi.c               |   2 +-
 arch/riscv/kernel/head.S                      |  18 +-
 arch/riscv/kernel/process.c                   |   3 +-
 arch/riscv/kernel/suspend.c                   |  86 +++
 arch/riscv/kernel/suspend_entry.S             | 123 ++++
 drivers/cpuidle/Kconfig                       |   9 +
 drivers/cpuidle/Kconfig.arm                   |   1 +
 drivers/cpuidle/Kconfig.riscv                 |  15 +
 drivers/cpuidle/Makefile                      |   5 +
 drivers/cpuidle/cpuidle-psci-domain.c         | 138 +---
 drivers/cpuidle/cpuidle-psci.h                |  15 +-
 drivers/cpuidle/cpuidle-sbi.c                 | 625 ++++++++++++++++++
 drivers/cpuidle/dt_idle_genpd.c               | 182 +++++
 drivers/cpuidle/dt_idle_genpd.h               |  50 ++
 27 files changed, 1467 insertions(+), 183 deletions(-)
 rename Documentation/devicetree/bindings/{arm => cpu}/idle-states.yaml (74%)
 create mode 100644 arch/riscv/include/asm/cpuidle.h
 create mode 100644 arch/riscv/include/asm/suspend.h
 create mode 100644 arch/riscv/kernel/suspend.c
 create mode 100644 arch/riscv/kernel/suspend_entry.S
 create mode 100644 drivers/cpuidle/Kconfig.riscv
 create mode 100644 drivers/cpuidle/cpuidle-sbi.c
 create mode 100644 drivers/cpuidle/dt_idle_genpd.c
 create mode 100644 drivers/cpuidle/dt_idle_genpd.h

-- 
2.25.1