From patchwork Thu Jan 11 19:44:23 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baruch Siach X-Patchwork-Id: 859274 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3zHbvt1jFqz9t20 for ; Fri, 12 Jan 2018 06:45:46 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934569AbeAKTpn (ORCPT ); Thu, 11 Jan 2018 14:45:43 -0500 Received: from guitar.tcltek.co.il ([192.115.133.116]:59950 "EHLO mx.tkos.co.il" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934425AbeAKTpk (ORCPT ); Thu, 11 Jan 2018 14:45:40 -0500 Received: from tarshish.tkos.co.il (unknown [10.0.8.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx.tkos.co.il (Postfix) with ESMTPSA id 8FB10440032; Thu, 11 Jan 2018 21:45:17 +0200 (IST) From: Baruch Siach To: Dave Stevenson , Eric Anholt , Stefan Wahren , Linus Walleij Cc: linux-gpio@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Michael Zoran , Baruch Siach Subject: [PATCH v2 0/4] gpio: driver for the RPi3 GPIO expander Date: Thu, 11 Jan 2018 21:44:23 +0200 Message-Id: X-Mailer: git-send-email 2.15.1 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The Raspberry Pi 3 has a GPIO expander that controls, among others, the activity LED, and the camera connector GPIOs. The GPIO expander on an I2C bus that is not directly controlled from the ARM core. The VC4 firmware controls the I2C bus, and allows the ARM core to set/get GPIO settings over its mailbox interface. This series adds support for the RPi3 expander. The driver is ported from the downstream kernel at https://github.com/raspberrypi/linux/, branch rpi-4.9.y. Changes in v2: * Driver renamed to gpio-raspberrypi-exp * Compatible string renamed to "raspberrypi,firmware-gpio" * Firmware error check * Smaller tweaks listed in individual patches Baruch Siach (3): ARM: bcm2835: sync firmware properties with downstream dt-bindings: gpio: add raspberry pi GPIO expander binding ARM: dts: bcm2837-rpi-3-b: add GPIO expander Dave Stevenson (1): gpio: raspberrypi-exp: Driver for RPi3 GPIO expander via mailbox service .../bindings/gpio/raspberrypi,firmware-gpio.txt | 24 ++ arch/arm/boot/dts/bcm2837-rpi-3-b.dts | 10 + drivers/gpio/Kconfig | 9 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-raspberrypi-exp.c | 258 +++++++++++++++++++++ include/soc/bcm2835/raspberrypi-firmware.h | 18 ++ 6 files changed, 320 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt create mode 100644 drivers/gpio/gpio-raspberrypi-exp.c