From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755772AbaIWOrR (ORCPT ); Tue, 23 Sep 2014 10:47:17 -0400 Received: from mail-wi0-f177.google.com ([209.85.212.177]:62296 "EHLO mail-wi0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751892AbaIWOrO (ORCPT ); Tue, 23 Sep 2014 10:47:14 -0400 From: Antonios Motakis To: alex.williamson@redhat.com, kvmarm@lists.cs.columbia.edu, iommu@lists.linux-foundation.org Cc: tech@virtualopensystems.com, kvm@vger.kernel.org, christoffer.dall@linaro.org, will.deacon@arm.com, kim.phillips@freescale.com, eric.auger@linaro.org, marc.zyngier@arm.com, Antonios Motakis , linux-api@vger.kernel.org (open list:ABI/API), linux-kernel@vger.kernel.org (open list) Subject: [PATCHv7 08/26] driver core: amba: add documentation for binding path 'driver_override' Date: Tue, 23 Sep 2014 16:46:07 +0200 Message-Id: <1411483586-29304-9-git-send-email-a.motakis@virtualopensystems.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1411483586-29304-1-git-send-email-a.motakis@virtualopensystems.com> References: <1411483586-29304-1-git-send-email-a.motakis@virtualopensystems.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add documentation for alternative binding path 'driver_override' for AMBA devices. Signed-off-by: Antonios Motakis --- Documentation/ABI/testing/sysfs-bus-amba | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-amba diff --git a/Documentation/ABI/testing/sysfs-bus-amba b/Documentation/ABI/testing/sysfs-bus-amba new file mode 100644 index 0000000..e7b5467 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-amba @@ -0,0 +1,20 @@ +What: /sys/bus/amba/devices/.../driver_override +Date: September 2014 +Contact: Antonios Motakis +Description: + This file allows the driver for a device to be specified which + will override standard OF, ACPI, ID table, and name matching. + When specified, only a driver with a name matching the value + written to driver_override will have an opportunity to bind to + the device. The override is specified by writing a string to the + driver_override file (echo vfio-amba > driver_override) and may + be cleared with an empty string (echo > driver_override). + This returns the device to standard matching rules binding. + Writing to driver_override does not automatically unbind the + device from its current driver or make any attempt to + automatically load the specified driver. If no driver with a + matching name is currently loaded in the kernel, the device will + not bind to any driver. This also allows devices to opt-out of + driver binding using a driver_override name such as "none". + Only a single driver may be specified in the override, there is + no support for parsing delimiters. -- 1.8.3.2