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Wed, 11 Nov 2026 07:17:09 -0800 (PST) Received: from dev.Default ([86.127.229.203]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4988bdef64dsm10149677f8f.20.2026.11.11.07.17.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Nov 2026 07:17:08 -0800 (PST) From: Agustin Santiago Isasmendi To: Arnd Bergmann Cc: Russell King , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Stefan=20D=C3=B6singer?= , Navid Ghahremani , Krzysztof Kozlowski Subject: Re: [PATCH 2/2] ARM: l2c: honour status = "disabled" on the L2 cache node Date: Wed, 11 Nov 2026 16:17:07 +0100 Message-Id: <20261111151707.2253768-1-isasmendi.agus@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <49846243-34ae-4643-9b39-1537947fbd96@app.fastmail.com> References: <20261111133930.3665251-1-isasmendi.agus@gmail.com> <20261111133930.3665251-3-isasmendi.agus@gmail.com> <49846243-34ae-4643-9b39-1537947fbd96@app.fastmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Wed, Nov 11, 2026 at 14:56, Arnd Bergmann wrote: > It is a little strange to use the MMIO registers of a status="disabled" > device to turn it off, and it would be nice if we could require > the firmware to leave it in a consistent state instead, but I assume > you can't do that for the one device you are interested in because > you don't have the firmware sources, right? On the H3600 the firmware leaves it off (control register 0 at kernel entry, cold and warm; the bootloader never touches the controller), so this board only needs the early return. To be honest I also prefer the firmware to be responsible for leaving the cache off when the device tree disables it; I went the conservative way for a firmware I do not control. If you agree, v2 drops the disable path and patch 1, keeps just the early return, and adds a line to the binding saying so. Otherwise I keep the check and add the comment. Agustin