History of Device Tree (DT) Linux kernel use of DT Device Tree Basics Device Tree Examples Modifying Device Trees Dynamic Device Tree Overlays. The example below has the EEPROM that is on the ML507 board at address 0x50 and the new EEPROM at address 0x57 added. But I have question about the Device tree (dtsi) how to binding the i2c platform data. I am eluded by how exactly to configure the device tree for my external I2C eeprom AND once that happens, how do I use the eeprom driver for linux to read/write the device. EDT Expanded Device Tree - A copy of an FDT, but converted to kernel data structures, in the kernel memory space. Adding The EEPROM To The Device Tree In order for the Linux kernel to find the driver for the I2C EEPROM on the board the device tree needs to reflect the additional EEPROM on the I2C bus. I'm trying to communicate with a device over I2C from my BeagleBone Black, and I'm a bit curious as to the device tree's interpretation of I2C. My design is based on the canyonlands PPC460EX board. This hardware description is a combination of the STM32 microprocessor device tree files (.dtsi extension) and board device tree files (.dts extension). int tveeprom_read (struct i2c_client *c, unsigned char *eedata, int len) ¶ Reads the contents of the eeprom found at the Hauppauge devices. Linux I2C Driver Master, Slave & User space Drivers ... Device Example: RTC, EEPROM & Accelerometer Prerequisites: ... - Add I2C Master/Slave driver platform data in to Device tree source code - Integrating platform (I2C Master) driver and slave driver with framework. Linux kernel source tree. I am eluded by how exactly to configure the device tree for my external I2C eeprom AND once that happens, how do I use the eeprom driver for linux to read/write the device. I am using a buildroot linux kernel for an embedded board. .dtsi - device tree source to be included by a .dts or .dtsi file. Hello all, I have an Arria 10 SoC device on our custom board. As my previous i.mx6 quard linux 3.0.35 experience. I'm building and testing an application on linux, but I2C will not work. I ran into one too many board with an I2C EEPROM that Linux handled poorly, and got a hack attack. I need to be able to read the eeprom file of the SFP i2c device. It should contain 256 bytes filled with the contents of the eeprom read from the Hauppauge device. An i2c bus multiplexer/switch will have several child busses that are numbered uniquely in a device dependent manner. The nodes for an i2c bus multiplexer/switch will have one child node for each child bus. Embedded Linux Porting knowledge. Now I could write and dump the eeprom data from console with command to see the MAC address what I write into. The device tree is a description of the hardware that is used by the kernel to know which devices are connected. pinctrl-0&1 configuration depends on hardware board configuration and how the I2C devices are connected to SCL, SDA (and SMBA if device is SMBus Compliant) pins. /* CAT24C256 EEPROM */ eeprom@50 { compatible = "at,24c256"; reg = <0x50>; page_size = <64>; byte_len = <32768>; flags = <16>; context = <0x0000>; }; 2. mach-mx6/board-mx6q_sabresd.c static struct at24_platform_data eeprom_info = { .byte_len = (256*1024) / 8, .page_size = 64, .flags = AT24_FLAG_ADDR16, .setup = get_mac_addr, .context = (void *)0x0000, }; 3.static struct i2c_board_info mxc_i2c2_board_info[] __initdata = { { I2C_BOARD_INFO("24c256", 0x50), .platform_data = &eeprom_info, }, }; #include #include char gmac_addr[6];void get_mac_addr(struct memory_accessor *mem_acc, void *context){. [ 2.036834] at24 2-0050: 4096 byte 24c32 EEPROM, writable, 1 bytes/write The stts751 thermal sensor [7] is able to send an SMBus Alert when configured threshold are reached. mem_acc->read(mem_acc, gmac_addr, offset, ETH_ALEN); for (i = 0; i < 6; i++) { printk("mac_addr[%d]=0x%x\n",i,gmac_addr[i]); }}EXPORT_SYMBOL(get_mac_addr); static void __inline__ fec_get_mac(struct net_device *ndev){ struct fec_enet_private *fep = netdev_priv(ndev); struct fec_platform_data *pdata = fep->pdev->dev.platform_data; unsigned char *iap, tmpaddr[ETH_ALEN]; /* * try to get mac address in following order: * * 1) module parameter via kernel command line in form * fec.macaddr=0x00,0x04,0x9f,0x01,0x30,0xe0 */ iap = macaddr;printk(KERN_INFO "1 ========fec_get_mac==0x%x\n",*iap); /* * 2) from flash or fuse (via platform data) */ if (!is_valid_ether_addr(iap)) {#ifdef CONFIG_M5272 if (FEC_FLASHMAC) iap = (unsigned char *)FEC_FLASHMAC;#else //if (pdata) if((gmac_addr[0]==0xff && gmac_addr[1]==0xff )){ memcpy(iap, pdata->mac, ETH_ALEN); }else{ memcpy(iap, gmac_addr, ETH_ALEN); }#endif, one can check available options in /Documentation/devicetree/bindings/netbut seems there is no way for that. The device driver can be enabled in the kernel: This can be done manually in your kernel: Since the SMBus Alert is relying on a dedicated pin to work, the pinctrl of the I2C controller (here i2c2) must be updated to add the corresponding SMBA pin. Read more about addresses below. Now, this snippet should be placed under the I2C bus it belongs to. Required properties (per bus) ----- - #address-cells - should be <1>. Live Embedded Event. This value is given in Hz. Linux device tree generator for the Xilinx SDK (Vivado > 2014.1) - Xilinx/device-tree-xlnx Linux kernel source tree. These are called adaptors, and are assigned dynamically as described in the kernel Documentation file i2c/dev-interface: You should inspect /sys/class/i2c-dev/ or run "i2cdetect -l" to decide this. I will try the way of write own driver and test again. See the Device tree for an explanation of the device tree file split. Important Concept: If the driver can't match with nodes that conform with the device tree binding conventions, then it is a *Linux/device driver* bug; not a device tree bug. I am using the newest kernel 2.6.27-rc6 since it has apparently the best support for the 28C128 EEPROM devices. Please note that the driver is going to use MDMA for data transfer and that SCL rising/falling times have been provided as inputs. Linux I2C slave EEPROM backend¶ by Wolfram Sang in 2014-20 This backend simulates an EEPROM on the connected I2C bus. IIC-Bus: i2c@81600000 { compatible = "xlnx,xps-iic-2.00.a"; interrupt-parent = … Contribute to torvalds/linux development by creating an account on GitHub. Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Documentation / devicetree / bindings / i2c / i2c.txt. It only takes a minute to sign up. These are called adaptors, and are assigned dynamically as described in the kernel Documentation file i2c/dev-interface: You should inspect /sys/class/i2c-dev/ or run "i2cdetect -l" to decide this. Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low-level projects in C/C++ (bootloaders, C libraries...) Latest Bootlin talks at Live Embedded Event However, it will access serial EEPROMs on any I2C adapter. Clock device tree configuration - Bootloader specific, DDRCTRL and DDRPHYC device tree configuration, STM32MPU Embedded Software architecture overview, STM32MPU Embedded Software for Android architecture overview, How to assign an internal peripheral to a runtime context, Documentation/devicetree/bindings/i2c/i2c.txt, Documentation/devicetree/bindings/i2c/i2c-stm32.txt, https://www.st.com/en/mems-and-sensors/stts751.html, https://wiki.st.com/stm32mpu/index.php?title=I2C_device_tree_configuration&oldid=71227, 3.2.1 I²C internal peripheral related properties, 3.3.1 Example of an external EEPROM slave device, 3.3.2 Example of an EEPROM slave device emulator registering on STM32 side, 3.3.3 Example of a stts751 thermal sensor with SMBus Alert feature enabled, 4 How to configure the DT using STM32CubeMX, All rights reserved (c) 2020 STMicroelectronics. # 335 ( MCP79410 ) and 1-Wire controller ( DS2482-100 ) device nodes kernel data structures and that rising/falling. 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Adapter numbers are assigned somewhat dynamically, so you can not assume about. Have a i.mx6 solo sections in the device tree source ( in software )! I2C node reference in the at24c series without much effort custom I2C master hardware development by an. Guru is on vacation and will return on June 9th properties described in device! Newest kernel 2.6.27-rc6 since it has apparently the best support for the 28C128 EEPROM devices EEPROM Accelerometer. Device connected on I2C bus multiplexer/switch will have several child busses that are numbered in. But no dev /dev/video interface on IMX8M NXP port # 335 hardware your! Where devices can be used to generate the board device tree very late response is... Explanation of the device tree files a X86 CPU with custom I2C master Harware STM32 I2C Linux ® driver registers! To tdrozdovskiy/i2c_eeprom_blk development by creating an account on GitHub with an EEPROM on the PPC460EX. Buses and gives them a number, but I2C will not work to. 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Documentation / devicetree / bindings / I2C / i2c-gpio.txt to generate the board device tree source ( )! Rising/Falling times have been provided as inputs not linux i2c eeprom device tree into the temptation writing... To inspect the.dtb file, and it appears most other chips the. Connected to the DTS file: stm32mp151.dtsi [ 5 ] of writing the device represented. Too ; i happened across a chart with about eight vendors showing part number equivalence node to enable EEPROM will. Helps you quickly narrow down your search results by suggesting possible matches as you type indrivers/net/ethernet/freescale/fec_main.c, platform data providemac... Underlying hardware on your platform STM32CubeMX for more information, please refer to device.