From patchwork Thu Jan 21 16:36:09 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?TcOlbnMgUnVsbGfDpXJk?= X-Patchwork-Id: 8082951 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 21BF4BEEE5 for ; Thu, 21 Jan 2016 16:36:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3E2242043C for ; Thu, 21 Jan 2016 16:36:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 45A4A203F7 for ; Thu, 21 Jan 2016 16:36:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965473AbcAUQgX (ORCPT ); Thu, 21 Jan 2016 11:36:23 -0500 Received: from unicorn.mansr.com ([81.2.72.234]:52424 "EHLO unicorn.mansr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965455AbcAUQgX (ORCPT ); Thu, 21 Jan 2016 11:36:23 -0500 Received: by unicorn.mansr.com (Postfix, from userid 51770) id DB1D115393; Thu, 21 Jan 2016 16:36:14 +0000 (GMT) From: Mans Rullgard To: linux-spi@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: [TROLL PATCH] spi: add option to create spidev nodes for unclaimed chip selects Date: Thu, 21 Jan 2016 16:36:09 +0000 Message-Id: <1453394169-11458-1-git-send-email-mans@mansr.com> X-Mailer: git-send-email 2.7.0 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This adds an option to create spidev nodes for any chip selects not bound to a driver via DT/ACPI. It probably doesn't play nicely with modules. Signed-off-by: Mans Rullgard --- drivers/spi/Kconfig | 4 ++++ drivers/spi/spi.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 8b9c2a38d1cc..4977fc2fbb30 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -689,6 +689,10 @@ config SPI_SPIDEV Note that this application programming interface is EXPERIMENTAL and hence SUBJECT TO CHANGE WITHOUT NOTICE while it stabilizes. +config SPI_SPIDEV_AUTO + bool "Create spidev nodes for unclaimed chip selects" + depends on SPI_SPIDEV + config SPI_TLE62X0 tristate "Infineon TLE62X0 (for power switching)" depends on SYSFS diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index dee1cb87d24f..8c0294387e6d 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1654,6 +1654,34 @@ static void acpi_register_spi_devices(struct spi_master *master) static inline void acpi_register_spi_devices(struct spi_master *master) {} #endif /* CONFIG_ACPI */ +#ifdef CONFIG_SPI_SPIDEV_AUTO +static void spidev_register_spi_devices(struct spi_master *master) +{ + struct spi_device *spi; + int err; + int i; + + for (i = 0; i < master->num_chipselect; i++) { + spi = spi_alloc_device(master); + if (!spi) + return; + + strlcpy(spi->modalias, "spidev", sizeof(spi->modalias)); + spi->chip_select = i; + + err = bus_for_each_dev(&spi_bus_type, NULL, spi, spi_dev_check); + + if (!err) + err = spi_add_device(spi); + + if (err) + spi_dev_put(spi); + } +} +#else +static void spidev_register_spi_devices(struct spi_master *master) { } +#endif + static void spi_master_release(struct device *dev) { struct spi_master *master; @@ -1849,6 +1877,7 @@ int spi_register_master(struct spi_master *master) /* Register devices from the device tree and ACPI */ of_register_spi_devices(master); acpi_register_spi_devices(master); + spidev_register_spi_devices(master); done: return status; }