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[78.11.189.27]) by smtp.googlemail.com with ESMTPSA id l18-20020adfe592000000b001f064ae9830sm2007779wrm.37.2022.03.16.09.28.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 16 Mar 2022 09:28:51 -0700 (PDT) Message-ID: <662981fe-7cf4-b0e6-2d43-3f33a53a6abd@canonical.com> Date: Wed, 16 Mar 2022 17:28:49 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH 2/3] dt-bindings: timer: Document arm,cortex-a7-timer for arch timer Content-Language: en-US To: Kuldeep Singh , Marc Zyngier , Mark Rutland , Daniel Lezcano , Thomas Gleixner , Rob Herring Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org References: <20220316095433.20225-1-singh.kuldeep87k@gmail.com> <20220316095433.20225-3-singh.kuldeep87k@gmail.com> From: Krzysztof Kozlowski In-Reply-To: <20220316095433.20225-3-singh.kuldeep87k@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 16/03/2022 10:54, Kuldeep Singh wrote: > Renesas RZ/N1D platform uses compatible "arm,cortex-a7-timer" in > conjugation with "arm,armv7-timer". Since, initial entry is not > documented, it start raising dtbs_check warnings. > > ['arm,cortex-a7-timer', 'arm,armv7-timer'] is too long > 'arm,cortex-a7-timer' is not one of ['arm,armv7-timer', 'arm,armv8-timer'] > 'arm,cortex-a7-timer' is not one of ['arm,cortex-a15-timer'] > > In general, removing an existing entry is mostly devastating considering > backward compatibility. Therefore, document it. How removing undocumented and unused compatible is devastating for backwards compatibility? I don't see it. DTS is rather wrong, not bindings. Otherwise please explain it more, why DTS is correct. Best regards, Krzysztof