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 EE7BEC78853 for ; Fri, 20 Sep 2024 14:57:54 +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=pFpVjdjrLQC/XXJHpu9DPbQ17X5Lr2yOqy9R5WhzboE=; b=OKsUE9+gU3HUeF10tjcpZu5hp2 LGbAiFMhNwGtkFfkq28Gqw82FrRiFRoU4jErjrtRDUTIE0QemmMX70rfmLjzZesF1zV6ENnlbU/JQ NgK8MnzePKBbRVT3Ye18bvGnOZPA8VxZJVUWD8vpkMyChauDSMpe6qvl7xHbM96SvF/JgolGgAw6l U+i5cRW85h4Pf8KqEBFFsrHUdry4mgF5Aor4BHkrObSEX0zQd7ewoOdnW79+0k7cafS6IRbc1NpNM 3TumK73ISMmQu+z1N1Iwu15KfCENkjfIY1uS9ZY8UVEqTT//LlUvdzEPysgW73dOFpRP7AmyKo7MU WW8SMlTA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1srf4p-0000000CQfV-2hV6; Fri, 20 Sep 2024 14:57:43 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1srf3i-0000000CQY6-33IV for linux-arm-kernel@lists.infradead.org; Fri, 20 Sep 2024 14:56:36 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 23DD65C5625; Fri, 20 Sep 2024 14:56:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1342FC4CEC3; Fri, 20 Sep 2024 14:56:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726844193; bh=8Qg1iY3o93a4LTA+ya6IEHEBHO0XR9NhsFaS3l8Zm1k=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=DW7Eew1pwfrkc6qYVb14pexGV7yS1IbuW5PsyK2ksVzMRVWKwAYN4G/CQZmeHzkOi GpIMerXOvcHsq4fICpIg6Ef9qqJjChESQfiAv6nbUwOXNDEYccceSYenMmMnJNEorT O0p7Gv0nN0JwnE+orEYx3IJdgOPIcm09JGFeIdOk+4hOSOXZ0Z9USZiOghxTX4BSSa MVUcEEjfXrXZDcyfSiNlpQ+AXtFoty54iE/WJ6ZoAQK2Ig40krp+kMt/HpDXTPZF98 X4AflcX9VWEdWf7Uf/WI5bGj0mR07dITShxUfb4AnYzP0rP2HndlsiE6NCD4BWsVrg mMZXf8P7iW/1A== Message-ID: <7784248d-4372-4cf1-a01a-5b731b3f6b96@kernel.org> Date: Fri, 20 Sep 2024 16:56:24 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/5] dt-bindings: remoteproc: sse710: Add the External Systems remote processors To: Abdellatif El Khlifi Cc: mathieu.poirier@linaro.org, Adam.Johnston@arm.com, Hugues.KambaMpiana@arm.com, Drew.Reed@arm.com, andersson@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org, krzysztof.kozlowski+dt@linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-remoteproc@vger.kernel.org, liviu.dudau@arm.com, lpieralisi@kernel.org, robh@kernel.org, sudeep.holla@arm.com, robin.murphy@arm.com References: <20240822170951.339492-1-abdellatif.elkhlifi@arm.com> <20240822170951.339492-2-abdellatif.elkhlifi@arm.com> <20240919093517.GA43740@e130802.arm.com> <222b3b11-151a-4ad0-91ea-54ae8f280bcb@kernel.org> <20240919145741.GA7940@e130802.arm.com> <85a223e9-05a4-4034-87a5-57d3eb9409b7@kernel.org> <20240920141958.GA288724@e130802.arm.com> 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-20240920_075634_937865_A7DF6B46 X-CRM114-Status: GOOD ( 17.94 ) 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 20/09/2024 16:19, Abdellatif El Khlifi wrote: > Hi Krzysztof, > >>>>>>> + '#extsys-id': >>>>>> >>>>>> '#' is not correct for sure, that's not a cell specifier. >>>>>> >>>>>> But anyway, we do not accept in general instance IDs. >>>>> >>>>> I'm happy to replace the instance ID with another solution. >>>>> In our case the remoteproc instance does not have a base address >>>>> to use. So, we can't put remoteproc@address >>>>> >>>>> What do you recommend in this case please ? >>>> >>>> Waiting one month to respond is a great way to drop all context from my >>>> memory. The emails are not even available for me - gone from inbox. >>>> >>>> Bus addressing could note it. Or you have different devices, so >>>> different compatibles. Tricky to say, because you did not describe the >>>> hardware really and it's one month later... >>>> >>> >>> Sorry for waiting. I was in holidays. >>> >>> I'll add more documentation about the external system for more clarity [1]. >>> >>> Basically, Linux runs on the Cortex-A35. The External system is a >>> Cortex-M core. The Cortex-A35 can not access the memory of the Cortex-M. >>> It can only control Cortex-M core using the reset control and status registers mapped >>> in the memory space of the Cortex-A35. >> >> That's pretty standard. >> >> It does not explain me why bus addressing or different compatible are >> not sufficient here. > > Using an instance ID was a design choice. > I'm happy to replace it with the use of compatible and match data (WIP). > > The match data will be pointing to a data structure containing the right offsets > to be used with regmap APIs. > > syscon node is used to represent the Host Base System Control register area [1] > where the external system reset registers are mapped (EXT_SYS*). > > The nodes will look like this: > > syscon@1a010000 { > compatible = "arm,sse710-host-base-sysctrl", "simple-mfd", "syscon"; > reg = <0x1a010000 0x1000>; > > #address-cells = <1>; > #size-cells = <1>; > > remoteproc@310 { > compatible = "arm,sse710-extsys0"; > reg = <0x310 4>; Uh, why do you create device nodes for one word? This really suggests it is part of parent device and your split is artificial. Best regards, Krzysztof