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 6FE3BC3ABBC for ; Fri, 9 May 2025 06:50:46 +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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:CC:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=eK58TLlJnYs4DpvxbqSmQLRIluJEvRYUiOzTtDtI3+c=; b=lf/U4MAfKVn8OSaxtU4zEBfLTp dF0K+wXu5QwKLYjCfB+l2xcDQV+IADTg8N+0Utj2mDk6SCl4bKrBcfNX+vFKFW2txwEUUHCu5bNRG dro1xHriZO384NdNSqXgUBAwRWL9eYjq839dKBvJIBiDaNxI69bWs0rgsxV1nbJ01Y9nTdTs4+seR SKCVTkrJUoCAlcc7b5ynfDyX8wzBUqL0aeKIL2pm2gu8tGB4bopb2LcU/WUeOZjsOxuYOygJjAg/k sWiGPqmuxJ5tou3gF4WIM0zzyl/yCEGntBFc/Ykp5GVwlNqKEITAez5jxRcvLLOU35hoZAUfG4UjI q5Mb/r4g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uDHZA-00000002f8F-0yWk; Fri, 09 May 2025 06:50:40 +0000 Received: from fllvem-ot03.ext.ti.com ([198.47.19.245]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uDHWZ-00000002efQ-1FTS for linux-arm-kernel@lists.infradead.org; Fri, 09 May 2025 06:48:00 +0000 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllvem-ot03.ext.ti.com (8.15.2/8.15.2) with ESMTPS id 5496lrAE1327694 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 9 May 2025 01:47:53 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1746773273; bh=eK58TLlJnYs4DpvxbqSmQLRIluJEvRYUiOzTtDtI3+c=; h=Date:From:To:CC:Subject:References:In-Reply-To; b=IYY8x33gKiwejVo0tvlfS8U5sVeupJ9RbHkt+/GPceStVRaZ93dV8Grw0nF+ZRC2+ Cn942mk1WhviXOHInDyPkrUnVVSBieUosnHfgxLinhlU7WDoUcvMdgK3ite0zaiRtE I8/514C+CT/sspGPoW6+oMt95CgnxXmUKADnCQI0= Received: from DLEE115.ent.ti.com (dlee115.ent.ti.com [157.170.170.26]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 5496lrrQ014593 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 9 May 2025 01:47:53 -0500 Received: from DLEE105.ent.ti.com (157.170.170.35) by DLEE115.ent.ti.com (157.170.170.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Fri, 9 May 2025 01:47:53 -0500 Received: from lelvsmtp6.itg.ti.com (10.180.75.249) by DLEE105.ent.ti.com (157.170.170.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Fri, 9 May 2025 01:47:53 -0500 Received: from localhost (uda0133052.dhcp.ti.com [128.247.81.232]) by lelvsmtp6.itg.ti.com (8.15.2/8.15.2) with ESMTP id 5496lrlj014571; Fri, 9 May 2025 01:47:53 -0500 Date: Fri, 9 May 2025 01:47:53 -0500 From: Nishanth Menon To: Sascha Hauer CC: Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , , , Subject: Re: [PATCH] arm64: dts: ti: k3-am625-sk: Add power/temperature sensors Message-ID: <20250509064753.4ntxyozwlebnskod@compound> References: <20250505-am625-sk-sensors-v1-1-688fb928b390@pengutronix.de> <20250507120104.4mhuaabe5auukarn@banter> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250508_234759_497230_B2D60131 X-CRM114-Status: GOOD ( 31.54 ) 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 08:32-20250509, Sascha Hauer wrote: > Hi Nishanth, > > On Wed, May 07, 2025 at 07:01:04AM -0500, Nishanth Menon wrote: > > On 15:24-20250505, Sascha Hauer wrote: > > > The AM625-SK has six power sensors and two temperature sensors connected > > > to I2C. Add them to the device tree. > > > > > > Signed-off-by: Sascha Hauer > > > --- > > > The AM625-SK has six power sensors and two temperature sensors connected > > > to I2C. Add them to the device tree. > > > > Sascha, > > > > I suggest making this as overlay. The reason is as follows: AM625-SK > > among other TI evms do have automated power measurement capability from > > XDS110 (accessible via USB port for jtag - appears as a rudimentary > > menu option). The way this works is that it uses TM4C1294NCPDT to use > > I2C commands to control the INA226/231 depending on the evm. > > > > This firmware should be flashed by default on production boards (if > > not, starting up CCS[1], autodetects older firmware and updates - at > > least to my understanding) - by the way, this firmware also does test > > automation, such as boot mode switch control, reset control etc. > > > > This is the primary framework meant to be used by test automation and > > indeed it is the default inside TI. > > > > Challenge here is this: if we make this default in Linux, the test > > automation system configures the INA226/231 in a different sampling > > mode depending on usecase etc Vs what Linux does (even though the > > shunt and the bus voltage for a given INA is the same). And just like > > Linux, the firmware power measurement logic has changed over the > > years. > > > > Anyways, while I know that the SoC and TM4C can both handle > > multi-master, the challenge is the same INA controlled and > > mix-configured by two masters (and there is no synchronization between > > the two). > > > > To avoid this entire conflict and headache, I suggest adding it as > > overlay that can be applied depending on the preference of measurement > > desired. > > Thanks for this explanation. I'll go for the overlay then. Thanks. do check if the default defconfig needs to be updated as well - i didn't get a chance to cross verify - will be good to ensure deferred devices are 0. if something to be enabled, do enable them as modules, i'd gladly pull it in. just a headsup - i plan on closing the window today and pick last set of patches and tag on monday. a bit tight given the window currently.. -- Regards, Nishanth Menon Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D