From mboxrd@z Thu Jan 1 00:00:00 1970 From: Fabio Estevam Subject: [PATCH v3] spi/imx: Fix spi-imx when the hardware SPI chipselects are used Date: Thu, 15 Sep 2011 17:21:15 -0300 Message-ID: <1316118075-14541-1-git-send-email-fabio.estevam@freescale.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: shawn.guo-KZfg59tc24xl57MIdRCFDg@public.gmane.org, kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Fabio Estevam To: Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: spi-devel-general-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-spi.vger.kernel.org commit 22a85e4cd51 (spi/imx: add device tree probe support) broke spi-imx usage when the SPI chipselect is the one internal to the controller. On a mx31pdk board the following error is seen: Registering mxc_nand as whole device ------------[ cut here ]------------ WARNING: at drivers/gpio/gpiolib.c:101 gpio_ensure_requested+0x4c/0xf4() autorequest GPIO-0 Modules linked in: [] (unwind_backtrace+0x0/0xf4) from [] (warn_slowpath_common+0x4c/0x64) [] (warn_slowpath_common+0x4c/0x64) from [] (warn_slowpath_fmt+0x30/0x40) [] (warn_slowpath_fmt+0x30/0x40) from [] (gpio_ensure_requested+0x4c/0xf4) [] (gpio_ensure_requested+0x4c/0xf4) from [] (gpio_direction_output+0xa0/0x138) [] (gpio_direction_output+0xa0/0x138) from [] (spi_imx_setup+0x38/0x4c) [] (spi_imx_setup+0x38/0x4c) from [] (spi_setup+0x38/0x50) [] (spi_setup+0x38/0x50) from [] (spi_add_device+0x94/0x124) [] (spi_add_device+0x94/0x124) from [] (spi_new_device+0x74/0xac) [] (spi_new_device+0x74/0xac) from [] (spi_match_master_to_boardinfo+0x20/0x40) [] (spi_match_master_to_boardinfo+0x20/0x40) from [] (spi_register_master+0xb0/0x104) [] (spi_register_master+0xb0/0x104) from [] (spi_bitbang_start+0x104/0x17c) [] (spi_bitbang_start+0x104/0x17c) from [] (spi_imx_probe+0x2fc/0x404) [] (spi_imx_probe+0x2fc/0x404) from [] (platform_drv_probe+0x18/0x1c) [] (platform_drv_probe+0x18/0x1c) from [] (driver_probe_device+0x78/0x174) [] (driver_probe_device+0x78/0x174) from [] (__driver_attach+0x8c/0x90) [] (__driver_attach+0x8c/0x90) from [] (bus_for_each_dev+0x60/0x8c) [] (bus_for_each_dev+0x60/0x8c) from [] (bus_add_driver+0xa0/0x288) [] (bus_add_driver+0xa0/0x288) from [] (driver_register+0x78/0x18c) [] (driver_register+0x78/0x18c) from [] (do_one_initcall+0x34/0x178) [] (do_one_initcall+0x34/0x178) from [] (kernel_init+0x74/0x118) [] (kernel_init+0x74/0x118) from [] (kernel_thread_exit+0x0/0x8) ---[ end trace 759f924b30fd5a44 ]--- Fix this issue by using the original chip select logic and make spi-imx to work again. Tested on a mx31pdk that uses the hardware SPI chipselect pins and also on a mx27pdk that uses GPIO as SPI chipselect. Signed-off-by: Fabio Estevam --- Changes since v2: - Place spi_imx->chipselect[i] = cs_gpio in the correct position Changes since v1: - Fix the logic for the internal chip select case and keep the usage of of_get_named_gpio for getting the cs_gpio drivers/spi/spi-imx.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 8ac6542..c5b14e6 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -786,9 +786,11 @@ static int __devinit spi_imx_probe(struct platform_device *pdev) int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); if (cs_gpio < 0) cs_gpio = mxc_platform_info->chipselect[i]; + + spi_imx->chipselect[i] = cs_gpio; if (cs_gpio < 0) continue; - spi_imx->chipselect[i] = cs_gpio; + ret = gpio_request(spi_imx->chipselect[i], DRIVER_NAME); if (ret) { while (i > 0) { -- 1.7.1 ------------------------------------------------------------------------------ Doing More with Less: The Next Generation Virtual Desktop What are the key obstacles that have prevented many mid-market businesses from deploying virtual desktops? How do next-generation virtual desktops provide companies an easier-to-deploy, easier-to-manage and more affordable virtual desktop model.http://www.accelacomm.com/jaw/sfnl/114/51426474/