From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D2FB0CCFA00 for ; Tue, 4 Nov 2025 07:14:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=OvKf4GcO+d/rH2U8P1cFtaG9uB8XPTtoNJ3hq6Ya1a8=; b=N0ozvGSDTAXHgWbpzQ9tfDrw3/ iTHcfHNVE14H6g7ggPTmFm13VQH2qJH3IKDyzRWmNEM4ROcL1UCexGG8JcNboW2srO/7U/VfXF+JY oaWNMl/DvlsJXS9/1MaJVVgooJOEte0csdc2tk9rzxno7L9K8RLFmmonYcZsC/xhsFC/odvcYZaF8 Cp9l8KyCytKILd9WLHmnKaZZtS+QdKmnSJEw5d0ydv2dJSz4MorGYTmencDVVQAEm0zkNgcfLpPGK DLQ3sKHQUxndbW4tJHgrS0vrqdwuVHT+CqERFGxHELFBMLQeHx6rW6jOROcDh/0zs1lbEDkKb4zjx lt7+34jw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vGBFB-0000000BJ7k-0DAK; Tue, 04 Nov 2025 07:14:17 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vGBF9-0000000BJ71-0IfN for linux-arm-kernel@lists.infradead.org; Tue, 04 Nov 2025 07:14:16 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 22E194084D; Tue, 4 Nov 2025 07:14:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EB39CC4CEF7; Tue, 4 Nov 2025 07:14:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762240454; bh=SSf0Rpn+K0mGokCfLmx8pESVX/TTUwsxUbFN2NWZMRA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=j3B5caX/k4j5t/VKIWrVuRTYvuua5zD2wSPJhdRsD+cA/MSFwoh7q0I/3GMqB4xjp 1fiBNFayP8CRHZtPizm2E/rKxcupAAxbtkHevSaHaINyU7QavY87C7rTry9Ouguip8 /XyUdglfw056D1nyy5pHsoHdrscc6WdLSqGGLkevJPTQqPPulpF/zPGuq9eGVv7v+8 KGrDTCdfZvmPy1yiTk9u0Ijl7sDMQMeVTR7+PcGrOUjHun1dPeZmdn/D69rV9I/9m3 hiN1+Hd+bG1he3OjmFUU36L/d0gs86URZcMV9qCwq8cYmtK/D1kRb3MJh25NcD5mEX k8wQ8lDMipvJw== Message-ID: Date: Tue, 4 Nov 2025 08:14:08 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 10/11] arm64: dts: exynos: gs101: add the chipid node To: Tudor Ambarus Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alim Akhtar , Peter Griffin , =?UTF-8?Q?Andr=C3=A9_Draszik?= , semen.protsenko@linaro.org, willmcvicker@google.com, kernel-team@android.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org References: <20251031-gs101-chipid-v1-0-d78d1076b210@linaro.org> <20251031-gs101-chipid-v1-10-d78d1076b210@linaro.org> <20251103-pompous-lean-jerboa-c7b8ee@kuoka> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251103_231415_158580_1BF8C86F X-CRM114-Status: GOOD ( 20.13 ) 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 03/11/2025 11:50, Tudor Ambarus wrote: > > > On 11/3/25 12:18 PM, Krzysztof Kozlowski wrote: >> On Fri, Oct 31, 2025 at 12:56:09PM +0000, Tudor Ambarus wrote: >>> Add the chipid node. >>> >>> Signed-off-by: Tudor Ambarus >>> --- >>> arch/arm64/boot/dts/exynos/google/gs101.dtsi | 6 ++++++ >>> 1 file changed, 6 insertions(+) >>> >>> diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot/dts/exynos/google/gs101.dtsi >>> index d06d1d05f36408137a8acd98e43d48ea7d4f4292..11622da2d46ff257b447a3dfdc98abdf29a45b9a 100644 >>> --- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi >>> +++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi >>> @@ -467,6 +467,12 @@ opp-2802000000 { >>> }; >>> }; >>> >>> + chipid { >>> + compatible = "google,gs101-chipid"; >> >> That's not a real device, sorry. >> >> I had some doubts when reading the bindings, then more when reading >> driver - like chipid probe() was basically empty, no single device >> access, except calling other kernel subsystem - and now here no single >> actual hardware resource, except reference to other node. >> >> Are you REALLY REALLY sure you have in your datasheet such device as >> chipid? >> >> It is damn basic question, which you should start with. > > Documentation says that GS101 "includes a CHIPID block for the software > that sends and receives APB interface signals to and from the bus system. > The first address of the SFR region (0x1000_0000) contains the product ID." So chipid@1000_0000 > > 0x1000_0000 is the base address of the OTP controller (OTP_CON_TOP). and efuse@1000_0000 from your other patchset and your sentence above. Please add them to DTS and check for warnings. > > "CHIPID block" tells it's a device, no? But now I think it was just an > unfortunate datasheet description. Do you have an advice on how I shall > treat this next please? Maybe register to the soc interface directly from > the OTP controller driver? I think in the SoC it is impossible or at least never happening that you create two devices for the same address, therefore either chipid is a device or efuse is a device. Best regards, Krzysztof