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Fri, 17 Nov 2023 03:10:44 -0800 (PST) Received: from [192.168.1.20] ([178.197.218.126]) by smtp.gmail.com with ESMTPSA id f12-20020a1709062c4c00b009ddcfbac9e7sm671379ejh.84.2023.11.17.03.10.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Nov 2023 03:10:43 -0800 (PST) Message-ID: <184ab92d-9246-43e4-a40d-465d51208585@linaro.org> Date: Fri, 17 Nov 2023 12:10:42 +0100 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/2] dt-bindings: timer: thead,c900-aclint-mtimer: separate mtime and mtimecmp regs Content-Language: en-US To: Inochi Amaoto , Daniel Lezcano , Thomas Gleixner , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Albert Ou , Chen Wang Cc: Guo Ren , Jisheng Zhang , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org References: From: Krzysztof Kozlowski Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 17/11/2023 06:07, Inochi Amaoto wrote: > The timer registers of aclint don't follow the clint layout and can > be mapped on any different offset. As sg2042 uses separated timer > and mswi for its clint, it should follow the aclint spec and have > separated registers. > > The previous patch introduced a new type of T-HEAD aclint timer which > has clint timer layout. Although it has the clint timer layout, it > should follow the aclint spec and uses the separated mtime and mtimecmp > regs. So a ABI change is needed to make the timer fit the aclint spec. > > To make T-HEAD aclint timer more closer to the aclint spec, use > regs-names to represent the mtimecmp register, which can avoid hack > for unsupport mtime register of T-HEAD aclint timer. > I don't understand this reasoning. You had one entry, you still have one entry. Adding reg-names (not regs-names) does not change it. Best regards, Krzysztof