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 6E2C4F428EC for ; Wed, 15 Apr 2026 20:44:32 +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=jVDNzdmCcUlsrcDPwenbU6oXuaJkJzPJ3CKGZdPSExw=; b=pLBPdsCyGQZDyJesVDe/X7Du+H LMjEm72iKsf6amXvbAT3wFG8aTEHPgSEZDl5w8u1oXuRyh40TXF2GI1ENVI+P/9ck9tDOXegx+fj4 Tt6GtCebtmy4495KrJYqDeyFVg/zxp8kLhOl5EYPgepze5pPG6qZoGn+XX3mRKGZpyjlGPZUqj5Va iRefDzbObqJaSGTojZ3y9CqG5JhHdZs5Vhjk3t8+royK5LcqsHS+uVrMpOFxIfJMe0iReBggpnoYL 3V6f/v7Gc9GVEyJnN59otBLSDahrUFAU7r0uD5jKZE7lj7rO9xr7PiwsJppOpq3V2IlqCr2q/SjYb SxtXgbsw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wD75f-00000001b7g-11A1; Wed, 15 Apr 2026 20:44:14 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wD75S-00000001b6A-1qyT for linux-arm-kernel@lists.infradead.org; Wed, 15 Apr 2026 20:44:01 +0000 Received: from [10.17.149.54] (unknown [131.107.1.246]) by linux.microsoft.com (Postfix) with ESMTPSA id 4E13420B7128; Wed, 15 Apr 2026 13:43:49 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 4E13420B7128 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1776285829; bh=jVDNzdmCcUlsrcDPwenbU6oXuaJkJzPJ3CKGZdPSExw=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=aB9LsrWeWonZLUidOWbtG+WGecMNAQ0eEYn9NBQlFTgSPnPJnP9+gXG098if1T0Ll frn/9fedhMNADi5Q1gSjQ9lzDqwn2CDBGr7Th+5iEJ+79wx5H5/eovbgmm+hckQVKq kp2rqn8yySVuHYODVKqM3J8fz3AR/KHhBuXdQZVE= Message-ID: <58294850-4ed4-4fb4-8f46-186063b76a2f@linux.microsoft.com> Date: Wed, 15 Apr 2026 13:43:46 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH] mmc: host: sdhci-iproc: implement the .hw_reset callback To: Scott Branden Cc: Florian Fainelli , rjui@broadcom.com, sbranden@broadcom.com, linux-arm-kernel@lists.infradead.org, tgopinath@linux.microsoft.com, adrian.hunter@intel.com, linux-mmc@vger.kernel.org, kernel-list@raspberrypi.com References: <20260327222150.2108111-1-meaganlloyd@linux.microsoft.com> <3305684d-8517-47dd-8852-2e34d40fc712@linux.microsoft.com> <702c52e4-b0b3-4e1e-a40d-29e136e46d7d@broadcom.com> <448010ef-278c-4711-a244-447a2b1a22c1@linux.microsoft.com> Content-Language: en-US From: Meagan Lloyd In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260415_134354_847071_2844B425 X-CRM114-Status: GOOD ( 16.30 ) 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 4/15/2026 1:23 PM, Scott Branden wrote: > Hi Meagan, > > On Wed, Apr 15, 2026 at 11:08 AM Meagan Lloyd < > meaganlloyd@linux.microsoft.com> wrote: > >> On 4/13/2026 10:43 AM, Florian Fainelli wrote: >>> On 4/13/26 10:38, Meagan Lloyd wrote: >>>> On 3/27/2026 3:21 PM, Meagan Lloyd wrote: >>>>> Implement the .hw_reset callback so that the eMMC can be reset as >>>>> needed >>>>> given cap-mmc-hw-reset is set in the devicetree and the >>>>> functionality is >>>>> enabled on the eMMC. >>>>> >>>>> Signed-off-by: Meagan Lloyd >>>>> --- >>>>> >>>>> SDHCI_POWER_CONTROL[4] (SD Host Controller Standard) has been >>>>> repurposed >>>>> on my Broadcomm processor to be eMMC hardware reset >>>>> (SDIO*_eMMCSDXC_CTRL[12], HRESET). >>>>> >>>>> Can you confirm this repurposed bit is consistent across the Broadcomm >>>>> iProc processors and thus the .hw_reset callback can be uniformly >>>>> applied in this driver? >>>> Hi Ray & Scott, >>>> >>>> I hope you're doing well. This bit looks to have been repurposed from >>>> the SD Host Controller Standard's VDD2 Power Control to being used for >>>> toggling the hardware reset signal to eMMCs. Can you verify that it >>>> applies across the iProc processors so that I may finalize this patch? >>> Which iProc process are you using? If you are not sure this applies >>> broadly, can you at least make it specific to the SoC you are using? >> Yes, if it comes to that I can. I think it's overkill to roll a new >> compat string/associated structures over this small change, hence >> checking with Broadcomm iProc maintainers on this thread. >> > Which iProc processor are you using? You will have to check with > RaspberryPI as I think they use this driver as well. > If that family also supports it then you probably don't need a > compatibility string. The processor I am using is the BCM58732. Can you help direct me to someone who could comment from the RaspberryPi side?