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[144.49.247.125]) by smtp-relay.gmail.com with ESMTPS id 98e67ed59e1d1-39b16055f3fsm1438743a91.6.2026.09.03.12.38.45 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 03 Sep 2026 12:38:46 -0700 (PDT) X-Relaying-Domain: broadcom.com X-CFilter-Loop: Reflected Received: by mail-qt1-f198.google.com with SMTP id d75a77b69052e-52fc1e88189so6002741cf.1 for ; Thu, 03 Sep 2026 12:38:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1788464325; x=1789069125; darn=lists.infradead.org; h=content-transfer-encoding:content-type:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to :content-type; bh=brNSF6ql5aevmqbGax3CboePf220/VniLivOauNNsPk=; b=CoWf1HL5cKo8D1+Ji9BaU+EMT99nGJPYvgq9mYc4dUkeRL4TMsejP3AuJQaokN47aw +yKUkW3PYrzxWcFm07dotIEuLSbHSFPqsmukl2dhurSvDsfJHxX/KrYDAiL5CMpck1ta wKc2MeuF7QkWwaNqWaB2SAqXRO1vpi+HTVeGQ= X-Forwarded-Encrypted: i=1; AKwUvByifZ74JLmn0BlP+4coHhqq/SGrEW4P+7CqSaMPnfZSQQT1AiGxzaq9wJmnpIgz9Ww+J7N+j+9danR84BHseAqi@lists.infradead.org X-Received: by 2002:a05:622a:2505:b0:519:f884:b587 with SMTP id d75a77b69052e-53054961822mr14588851cf.27.1788464325195; Thu, 03 Sep 2026 12:38:45 -0700 (PDT) X-Received: by 2002:a05:622a:2505:b0:519:f884:b587 with SMTP id d75a77b69052e-53054961822mr14588241cf.27.1788464324657; Thu, 03 Sep 2026 12:38:44 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-530541eab6csm5221631cf.26.2026.09.03.12.38.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Sep 2026 12:38:44 -0700 (PDT) Message-ID: <1f4a0df1-97e0-48e7-bd08-6b31c8dcd0e9@broadcom.com> Date: Thu, 3 Sep 2026 12:38:40 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/4] dt-bindings: display: bcm2835-v3d: Add an optional reset line To: =?UTF-8?Q?Ma=C3=ADra_Canal?= , Krzysztof Kozlowski Cc: Maxime Ripard , Dave Stevenson , Raspberry Pi Kernel Maintenance , Stefan Wahren , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ray Jui , Scott Branden , Broadcom internal kernel review list , kernel-dev@igalia.com, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org References: <20260816-vc4-reset-control-v1-0-896444373716@igalia.com> <20260816-vc4-reset-control-v1-2-896444373716@igalia.com> <20260818-idealistic-chivalrous-sawfish-08ddae@quoll> <3ab273be-e811-45e4-adf1-75532c840bc8@igalia.com> Content-Language: en-US, fr-FR From: Florian Fainelli Autocrypt: addr=florian.fainelli@broadcom.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260903_123847_533388_1B8A3BA7 X-CRM114-Status: GOOD ( 19.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 8/18/26 03:35, Maíra Canal wrote: > Hi Krzysztof, > > On 18/08/26 06:05, Krzysztof Kozlowski wrote: >> On Sun, Aug 16, 2026 at 11:05:41AM -0300, Maíra Canal wrote: >>> The BCM2835 PM block has exposed a reset line for the V3D block since >>> commit 670c672608a1 ("soc: bcm: bcm2835-pm: Add support for power >>> domains >> >> This is a reset provider driver, so not really relevant here. Driver >> commit would be relevant if it was about consumer who implemented >> undocumented ABI. I suggest to drop reference to driver and instead >> describe the hardware. > > Ack. > >> >>> under a new binding."), which allows the GPU to be reset without >>> power-cycling its domain. Document it so that the vc4 driver can use >>> it to >>> recover from a GPU hang. >> >> Does every device have it? Cygnus as well? > > I'm not familiar to the Cygnus hardware, only Raspberry Pi, so I'd > appreciate if one of the folks from Broadcom could help us with this > information. > > However, just like the power domain, I added this property as optional > to accommodate the fact that the current Cygnus DT doesn't expose any > power domain or reset controller. I really don't know and have no visibility into these older chips, let's assume they don't. -- Florian