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Wysocki" Cc: Palmer Dabbelt , Paul Walmsley , Alexandre Ghiti , Len Brown , Atish Patra , Andrew Jones , Anup Patel , Will Deacon , Mark Rutland , linux-acpi@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH v4 0/1] Common csr_read_num() and csr_write_num() for RISC-V Date: Mon, 24 Nov 2025 16:50:30 +0530 Message-ID: <20251124112031.170350-1-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Some of the RISC-V drivers (such as RISC-V PMU and ACPI CPPC) need to access CSR based on CSR number discovered from somewhere. Add common RISC-V csr_read_num() and csr_write_num() functions under arch/riscv for such drivers. These patches can be found in the riscv_csr_read_num_v4 branch at: https://github.com/avpatel/linux.git Changes since v3: - Rebased on Linux-6.18-rc7 - Updated commit decription of PATCH1 to reflect the fact that we are removing sanity checks on CSR number which are already taken care by csr_read_num() and csr_write_num(). Changes since v2: - Rebased on Linux-6.18-rc1 - Added reviewed-by tags Changes since v1: - Make "out_err" mandatory for csr_read_num() and csr_write_num() in PATCH2 as suggested by Sunil and Drew. This also helps further simplify csr_read_num() and csr_write_num(). Anup Patel (1): RISC-V: Add common csr_read_num() and csr_write_num() functions arch/riscv/include/asm/csr.h | 3 + arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/csr.c | 165 +++++++++++++++++++++++++++++++++++ drivers/acpi/riscv/cppc.c | 17 ++-- drivers/perf/riscv_pmu.c | 54 ++---------- 5 files changed, 184 insertions(+), 56 deletions(-) create mode 100644 arch/riscv/kernel/csr.c -- 2.43.0