From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751833AbdASAiL (ORCPT ); Wed, 18 Jan 2017 19:38:11 -0500 Received: from mail-pg0-f66.google.com ([74.125.83.66]:33703 "EHLO mail-pg0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751796AbdASAiJ (ORCPT ); Wed, 18 Jan 2017 19:38:09 -0500 From: christopher.lee.bostic@gmail.com To: robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk, gregkh@linuxfoundation.org, mturquette@baylibre.com, geert+renesas@glider.be, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, joel@jms.id.au, linux-kernel@vger.kernel.org, andrew@aj.id.au, alistair@popple.id.au, benh@kernel.crashing.org Cc: Christopher Bostic Subject: [PATCH v3 00/18] FSI device driver introduction Date: Wed, 18 Jan 2017 18:30:33 -0600 Message-Id: <1484785833-24832-1-git-send-email-christopher.lee.bostic@gmail.com> X-Mailer: git-send-email 2.7.4 (Apple Git-66) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christopher Bostic Introduction of the IBM 'Flexible Support Interface' (FSI) bus device driver. FSI is a high fan out serial bus consisting of a clock and a serial data line capable of running at speeds up to 166 MHz. This set provides the basic framework to add FSI extensions to the Linux bus and device models. Master specific implementations are defined to utilize the core FSI function. In Linux, we have a core FSI "bus type", along with drivers for FSI masters and engines. The FSI master drivers expose a read/write interface to the bus address space. The master drivers are under drivers/fsi/fsi-master-*.c. The core handles probing and discovery of slaves and slave engines, using those read/write interfaces. It is responsible for creating the endpoint Linux devices corresponding to the discovered engines on each slave. Slave engines are identified by an 'engine' type, and an optional version. Engine, a.k.a. client, drivers are matched and bound to these engines during discovery. This patch set does not include extended FSI function such as: * Hub master support * Cascaded master support * Application layer hot plug notification * Application layer FSI bus status interface Common FSI terminology: * Master Controller of the FSI bus. Only the master is allowed to control the clock line and is the initiator of all transactions on a bus. * Slave The receiver or target of a master initiated transaction. The slave cannot initiate communications on a bus and must respond to any master requests for data. * CFAM Stands for Common Field replaceable unit Access Macro. A CFAM is an ASIC residing in any device requiring FSI communications. CFAMs consist of an array of hardware 'engines' used for various purposes. I2C masters, UARTs, General Purpose IO hardware are common types of these engines. * Configuration Space / Table A table contained at the beginning of each CFAM address space. This table lists information such as the CFAM's ID, which engine types and versions it has available, as well as its addressing range. * FSI Engine driver A device driver that registers with the FSI core so that it can access devices it owns on an FSI bus. Chris Bostic (8): drivers/fsi: Kick off master scan via sysfs drivers/fsi: Set up links for slave communication drivers/fsi: Set slave SMODE to init communication drivers/fsi: Remove all scanned devices during master unregister drivers/fsi: Add FSI bus documentation drivers/fsi: Add documentation for GPIO based FSI master drivers/fsi: Document FSI master sysfs files in ABI drivers/fsi: Add GPIO based FSI master Jeremy Kerr (10): drivers/fsi: Add empty fsi bus definitions drivers/fsi: Add device & driver definitions drivers/fsi: add driver to device matches drivers/fsi: Add fsi master definition drivers/fsi: Add slave definition drivers/fsi: Add empty master scan drivers/fsi: Add FSI crc calculators to library drivers/fsi: Implement slave initialisation drivers/fsi: scan slaves & register devices drivers/fsi: Add device read/write/peek functions Changes for v3: - Patch set contained an invalid 18/18 test patch not meant for community review, corrected. Changes for v2: - Change from atomic global for master number to ida simple interface. - Add valid pointer checks on register and unregister utils. - Move CRC calculation utilities out of driver to lib path. - Clean up white space issues. - Remove added list management of master devices and use instead the device_for_each_child method available in the bus. - Add new patch to document FSI bus functionality. - Add new patch documenting FSI gpio master. - Rearrage patch set to have documentation earlier than code implementing it. - Document all compatible strings used in device tree bindings. - Elaborate documentation definition of FSI GPIO master. - Describe in more detail what each GPIO FSI master pin is for. - Re-order compatible strings in example binding so that most specific device comes first. - Indicate proper activation order of all FSI GPIO master pins. - Fix an unmatched '>' bracket in the example for binding. - Bracket each element of the example bindings individually. - Add new patch documenting sysfs-bus-fsi attributes. - Merge FSI GPIO master init into probe function. - Set pin initial values at time of pin request. - Assign value of master->master.dev at probe time. - Use get_optional interface for all optional GPIO pins. Documentation/ABI/testing/sysfs-bus-fsi | 6 + .../devicetree/bindings/fsi/fsi-master-gpio.txt | 71 +++ Documentation/devicetree/bindings/fsi/fsi.txt | 54 +++ drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/fsi/Kconfig | 23 + drivers/fsi/Makefile | 3 + drivers/fsi/fsi-core.c | 494 +++++++++++++++++++ drivers/fsi/fsi-master-gpio.c | 530 +++++++++++++++++++++ drivers/fsi/fsi-master.h | 39 ++ include/linux/crc-fsi.h | 29 ++ include/linux/fsi.h | 60 +++ lib/Makefile | 1 + lib/crc-fsi.c | 39 ++ 14 files changed, 1352 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-fsi create mode 100644 Documentation/devicetree/bindings/fsi/fsi-master-gpio.txt create mode 100644 Documentation/devicetree/bindings/fsi/fsi.txt create mode 100644 drivers/fsi/Kconfig create mode 100644 drivers/fsi/Makefile create mode 100644 drivers/fsi/fsi-core.c create mode 100644 drivers/fsi/fsi-master-gpio.c create mode 100644 drivers/fsi/fsi-master.h create mode 100644 include/linux/crc-fsi.h create mode 100644 include/linux/fsi.h create mode 100644 lib/crc-fsi.c -- 1.8.2.2