Imx6 linux gpio driver

Unfortunately the kernel does not export leds via sysfs api sysclassleds while the device tree seems to parsed correctly. We would like to control leds connected to gpios on colibri i. Specific attention was given to implement the device driver based on the linux character device driver. Simple tools like cat and echo can be used to quickly read the current value of a gpio input or to set the level of a gpio output. I am interested in writing a module mygpiomodule which when loaded must appear in devmygpiomodule such that read, write from user space accesses the gpio. Linux uses a single integer to enumerate all pads, therefore freescales bankbit notation for gpios must be mapped. The sb option column specifies the sbfx6 carrier board pn code required for a particular feature.

I am implementing a custom board based around imx6q soc and referred the open source rex project as an example. Headquartered in lake forest, ca, boundary devices is an iso9001 certified nxp proven partner that has completed thousands of successful projects with the i. The guruce imx6 bsp is a high quality, well structured, 100% oal stable and production ready full source bsp for wec7 and wec20 supporting any board containing an nxp imx6 ultralight, ull, solo, duallite, dual, quad, dualplus or quadplus processor. Contents section number title page chapter 1 introduction 1. This is the gpio block and io the pad is pinmuxd to when hwconfig is configured for gpio this is the gpio mapped in linux accessible via sysclass gpio. I have sub device driver and bridge driver for the same platform. The dialog pmic da9063 has 16 configurable gpio pins. The gpio driver can be used from within the uboot source code. The imxseries cpus imx5, imx6, imx6sx, imx6ul, imx7d, imx8m. The example runtime linux filesystem image for the compulab clsomimx6 systemonmodule computeronmodule is based on debian gnulinux stretch. Hi, i am trying to configure gpio pin of imx6 saberlite board as interrupt in order to communicate with my video device. The api that is used to control gpio is the standard linux gpiolib interface. For bcm4330 devices edm1cf imx6, edm2cf imx6, edm1cfimx6sx, tc0700 and tc0750 the driver used is the broadcom fullmac driver, and the kernel modules needed to enable wifi are. Contribute to samnazarkolinuximx6 development by creating an account on github.

Browse other questions tagged linuxdevicedriver gpio or ask your own question. General purpose inputoutput gpio digi international. Note that for the command line interface to work the. Additionally, the gpio driver has a corresponding gpio command line interface that can be used to set and get gpio values. Spi not working in imx6 hi, im unable to communicate with an spi display connected to the imx6 with the spidev driver. Ive already changed the dts as stated in your spi linux documentation and the spidev3. Gpio pin configuration the default linux device tree pin configurarion of the dhcom. Controlling gpio from linux user space this application note explains how to drive gpio outputs and read the state of gpio inputs from the linux userspace on the stm32f429. Mx 6 industrial arm single board computer with dual can bus, rj45 and serial ports. The purpose of the bt8xxgpio driver is to export all of the 24 gpio pins available on brooktree 8xx chips to the kernel gpio infrastructure. Mxbased sbcs and soms for the general embedded market. The example runtime linux filesystem image for the compulab clsom imx6 systemonmodule computeronmodule is based on debian gnu linux stretch. Dear larsc, 1 will change the reg value and check again. Fill the table below based in the example provided.

The api is described in the linux documenation available in the kernel tree from the following file. The project was aimed at implementing a general purpose inputoutput gpio device driver for the raspberry pi model b rev 2. So this combined driver is utilizing two sub systems simultaneously. The gpio s need to be configured only after the gpio driver is loaded, if a gpio gets configured before the driver has been loaded, the gpio functions will have no effect. I am implementing a custom board based around imx6q soc and referred the. Unfortunately the imx6 still contains the same silicon bug as on the imx53. Embedded linux projects using yocto project cookbook, alex gonzalez, packt publishing. Sbc imx6 featureset is a combination of features provided by the attached clsom imx6 and the features implemented on sbfx6. How to use linux kernel to control leds connected to gpios. This application note explains how to drive gpio outputs and read the state of gpio inputs from the linux userspace on the stm32f429. Jun 26, 2014 hi, i am trying to configure gpio pin of imx6 saberlite board as interrupt in order to communicate with my video device. Type name latest commit message commit time failed to load latest commit information. Linux gpio interrupt driver is also pop, recently i write a namely project.

Sbcimx6 featureset is a combination of features provided by the attached clsomimx6 and the features implemented on sbfx6. The pin multiplexing, as well as the gpio specific configuration, is performed by the linux kernel drivers using the information from the metaemcraftrecipeskernel. Using gpio from a linux shell on imx based products technexion. Mx6 can handle external pins in many different ways. Shawn, ive noticed that for imx6 the gpiomxc gpio driver always returns 0 for gpios configured as outputs regardless of if they are outputing high or low. Note that for the command line interface to work the corresponding pin must be muxed to its gpio functionality in the uboot code. Jul 11, 2014 shawn, ive noticed that for imx6 the gpio mxc gpio driver always returns 0 for gpio s configured as outputs regardless of if they are outputing high or low. For bcm4330 devices edm1cfimx6, edm2cfimx6, edm1cfimx6sx, tc0700 and tc0750 the driver used is the broadcom fullmac driver, and the kernel modules needed to enable wifi are. In this tutorial we are going to learn how to manipulate gpios from linux on the i. Read value from data registerpad status registerpsr gpio write mode. Mx6 cpu has seven general purpose inputoutput gpio ports.

Gpio driver interface the linux kernel documentation. Right click the direction of each of them and configure pin 37 as input and pin 170 as output. If gdirn is set and iomuxc input mode is gpio, then reading drn returns the contents of drn. With simpler microcontroller systems, this is straightforward, but with a system like linux, you have to navigate through several layers of software and for very good reasons. The cm option column specifies the clsomimx6 pn code required for a particular feature. Gpio irq chip implementation, provided by gpio driver. Each of the gpio pins on raspberry pi is exposed to userspace for use by a device file in the dev. The compulab linux package for clsom imx6 includes ready to run nand flash image, linux kernel configuration and source code patches, and an archive of the root filesystem, used to create the image. All functionality offered by the imx6 is supported and configurable in our driver. This is the gpio block and io the pad is pinmuxd to when hwconfig is configured for gpio this is the gpio mapped in linux accessible via sysclassgpio. Most imx6 extension header pins can be configured as gpio. Im trying out a custom kernel from scratch and currently working on a framebuffer driver.

Hi all, i am new to this forum and i hope this topic is relevant to this specific forum section. If you dont get your gpio probably mean some driver reserved it or the use of that gpio is not configured in your kernel. And for some tasks, simple userspace gpio drivers could be all that the. Browse other questions tagged linux device driver gpio or ask your own question. How to implement an interrupt driven gpio input in linux. Basic gpio usage apalis evaluation board apalis imx6. Openocduser sysfsgpio performance over ftdi cbus gpio. Unfortunately linux kernel continuously change in structure based on distribution and so on. You may need to disable the definitions of these constant to avoid the collision e. Mx6 provides a can feature, which is supported by drivers using the proposed linux standard. This section describes how to manually enable and verify wifi from the linux command line.

How do can i find out which linux driver is hogging my gpio. Linux driver development for embedded processors, alberto liberal, circulo rojo. Nov 19, 2012 unfortunately linux kernel continuously change in structure based on distribution and so on. I have seen many examples but i get stuck with imx6 because i dont seems to find a. Depending on your board configuration some of the additional gpios shared with the camera interface are not available on your system. After attempting to write a simple char device driver i now wish to write a char device driver to access the gpio pins on a embedded linux board such as a beagleboard. For a particular feature to be present, both the cm and sb options of that feature must be implemented. Mx6 computer on module esomimx6 is production ready. Almost every pad has, as one of its 8 possible functions, a gpio role. Headquartered in lake forest, ca, boundary devices is an iso9001 certified nxp proven partner that has completed. Refer to the linux kernel documentation at documentationgpiosysfs. How to use linux kernel to control leds connected to gpios on colibri i.

Either by consulting the table from the article pointed above or calculating it, the previous table with the correspondence between apalis evaluation board pins and mxm3 pins can be extended to have the imx6 pin name alt5, formed by gpio controller, as example gpio2, plus pin at soc level, as example io04, and the linux numeric representation. The compulab linux package for clsomimx6 includes ready to run nand flash image, linux kernel configuration and source code patches, and an archive of the root filesystem, used to create the image. Linux gpio support includes the ability to export gpio control and status for use with applications using sysfs. Here i am unable to understand which file should i refer to add support for. The linux bsp and android bsp that is distributed as part of the ankaa rapid development kit for i. Browsing through the bd drivers for imx6, weve stumbled upon driversmxcipu3 which has the initialization routines.