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Mon, 18 Aug 2025 07:36:46 -0700 (PDT) Received: from localhost.localdomain ([122.171.22.169]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2446d50f664sm81704945ad.75.2025.08.18.07.36.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Aug 2025 07:36:45 -0700 (PDT) From: Anup Patel To: Sunil V L , "Rafael J . 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 v2 0/2] Common csr_read_num() and csr_write_num() for RISC-V Date: Mon, 18 Aug 2025 20:05:58 +0530 Message-ID: <20250818143600.894385-1-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250818_153648_602084_0FAB08F8 X-CRM114-Status: UNSURE ( 9.53 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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_v2 branch at: https://github.com/avpatel/linux.git 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 (2): ACPI: RISC-V: Fix FFH_CPPC_CSR error handling 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 | 21 ++--- drivers/perf/riscv_pmu.c | 54 ++---------- 5 files changed, 186 insertions(+), 58 deletions(-) create mode 100644 arch/riscv/kernel/csr.c -- 2.43.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv