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dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="eP4UM0+N" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 230D8C4AF0D; Wed, 17 Apr 2024 13:23:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713360200; bh=tcnQKu88XTy8wDaU4LOAQDFClMImiR13+BGl1UeDOcw=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=eP4UM0+NtCz0XOTbVtZ9hq4GdFytAqHlxVyBQGYbKRgFkjK/pn+0tVmHifavrNm95 zOClKjmZkDB9T2wTq540cBavx9obd5Z6JpoO104EMkKZwlG/5sDK9v89YOUUDVXmnn z8xiP70oY0hPB9GtGuRfETx435RMpKcfyOz/qxi4cif5JBJvF51Hm2SGJACyetP5/A X42B53ZE2/BVc3pbKtJEhhIxhpqoGEQ9fXJBeHQPKVL50H7e7AT2uOJ5DP4IrzIGU1 qc8BsVB+XhJ5Wn3Us2BhIDColZMm+oM9oCGHw018ffHOJ/xyt3ssDZOBCFFvMmWaz0 TH8p9747PcjcA== Message-ID: <48b2e0fd-4d7f-4bb6-aadd-804847e3250c@kernel.org> Date: Wed, 17 Apr 2024 15:23:19 +0200 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 3/4] ARM: dts: BCM5301X: Add DT for ASUS RT-AC3200 To: Florian Fainelli , =?UTF-8?B?QXLEsW7DpyDDnE5BTA==?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Hauke Mehrtens , Rafal Milecki , Broadcom internal kernel review list Cc: Tom Brautaset , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20240414-for-soc-asus-rt-ac3200-ac5300-v1-0-118c90bae6e5@arinc9.com> <20240414-for-soc-asus-rt-ac3200-ac5300-v1-3-118c90bae6e5@arinc9.com> <85261d11-d6cb-4718-88d9-95a7efe5c0ab@arinc9.com> <335cdd4b-7309-4633-9b4f-6487c72c395c@arinc9.com> <07c9c5f5-c4b9-44d6-b909-5aa306f56898@kernel.org> <00ba4593-d720-419a-a97d-37c402c91e44@arinc9.com> <7b465ddb-2b18-4e7f-8b03-d4e51006e1cb@broadcom.com> Content-Language: en-US From: Krzysztof Kozlowski Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 17/04/2024 05:15, Florian Fainelli wrote: > > > On 4/15/2024 2:10 AM, Arınç ÜNAL wrote: >> On 15.04.2024 10:57, Krzysztof Kozlowski wrote: >>> On 14/04/2024 22:21, Arınç ÜNAL wrote: >>>> NVRAM is described as both flash device partition and memory mapped >>>> NVMEM. >>>> This platform stores NVRAM on flash but makes it also memory accessible. >>>> >>>> As device partitions are described in board DTS, the nvram node must >>>> also >>> >>> Sorry, but we do not talk about partitions. Partitions are indeed board >>> property. But the piece of hardware, so NVMEM, is provided by SoC. >>> >>>> be defined there as its address and size will be different by board. >>>> It has >>>> been widely described on at least bcm4709 and bcm47094 SoC board DTS >>>> files >>>> here. >>> >>> These not proper arguments. What you are saying here is that SoC does no >>> have nvram at address 0x1c08000. Instead you are saying there some sort >>> of bus going out of SoC to the board and on the board physically there >>> is some NVRAM sort of memory attached to this bus. >> >> Yes that is the case. NVRAM is stored on a partition on the flash. On the >> Broadcom NorthStar platform, the NAND flash base is 0x1c000000, the NOR >> flash base is 0x1e000000. >> >> For the board in this patch, the flash is a NAND flash. The NVRAM partition >> starts at address 0x00080000. Therefore, the NVRAM component's address is >> 0x1c080000. > > Because the flash is memory mapped into the CPU's address space, a > separate node was defined since it is not part of the "soc" node which > describes the bridge that connects all of the peripherals. > > Whether we should create an additional bus node which describes the > bridge being used to access the flash devices using the MMIO windows is > debatable. Rafal, what do you think? Sorry guys, I don't get. I don't know the addresses neither the names like Broadcom Northstar, so this does not clarify me at all. Please answer the simple questions: 1. Is NAND flash part of SoC? 2. If not, is NAND flash provided by Broadcom or anyone else? Best regards, Krzysztof