From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arend van Spriel Subject: Re: [PATCH V4 01/15] mmc: host: Add facility to support re-tuning Date: Tue, 14 Apr 2015 18:52:10 +0200 Message-ID: <552D45BA.9090403@broadcom.com> References: <1427489863-9050-1-git-send-email-adrian.hunter@intel.com> <1427489863-9050-2-git-send-email-adrian.hunter@intel.com> <551BDAEA.20405@intel.com> <551C0A4C.9020602@broadcom.com> <551D1A59.5060803@broadcom.com> <551D3391.8040508@intel.com> <551D35C6.7070605@broadcom.com> <551D396F.1020301@intel.com> <5524DBD1.8020606@intel.com> <552D183B.5080409@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-gw3-out.broadcom.com ([216.31.210.64]:62899 "EHLO mail-gw3-out.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932958AbbDNQwO (ORCPT ); Tue, 14 Apr 2015 12:52:14 -0400 In-Reply-To: <552D183B.5080409@intel.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Adrian Hunter Cc: Ulf Hansson , linux-mmc , Aaron Lu , Philip Rakity , Al Cooper , Neil Brown On 04/14/15 15:38, Adrian Hunter wrote: >> To enumerate a SDIO card the mmc core first needs to apply power to >> > it. At this point the PM domain isn't yet attached to the SDIO func >> > device (the device doesn't even exist yet) and thus it can't be used >> > to provide power the card. Right? > In the ACPI case the SDIO function device ACPI nodes are children of the > host controller ACPI node. One possibility is to have the host controller > driver power on its children. This has recently been added to the DT as well as some SDIO devices first need to be powered to be discoverable. Regards, Arend