dts里有若干device的描述,linux在初始化时会把这些设备展开,形成设备列表。 platform driver中有匹配字段of_match_table,估计注册platform驱动时(module_platform_driver),platform bus负责匹配此字段和已有的dts设备列表。 platform driver和dev列表匹配上以后,driver中的probe就会执行,同时dev列表中的信息以probe形参struct...
例如我们修改添加的 uart_1 控制器的默认波特率为9600bps,然后重新生成 dts 文件,则可以看到 dts 文件中 uart_1 节点下的 currentspeed 属性值会从 115200 变为 9600。 三、设备树加载驱动原理 对于一个特定的设备节点,例如 alt_vip_vfr_tft,又有众多的属性描述来该节点的详细信息,用来提供给 Linux 系统用作设...
#define I2C_SWITCH_NONE 1 /*MAX SWITCH in this board is 1*/ 2.3 修改 kernel 代碼 --- a/arch/arm64/boot/dts/freescale/imx8x-mek-rpmsg.dtsi+++ b/arch/arm64/boot/dts/freescale/imx8x-mek-rpmsg.dtsi@@ -3,15 +3,15 @@ /delete-node/ &cm40_i2c;-/delete-node/ &i2c1;+// /...
0x20010c92 <i2c_stm32_in_transfer> 0x200106ec <i2c_stm32_dev_data_0+16> 0x801e9e0 <__device_dts_ord_18> 0x20010c91 <i2c_stm32_trigger_mode> 0x20014220 <sys_work_q_stack+1736>: 0x20010ef5 <icm20948_state_in_isr_transfer> 0x8010f47 <i2c_stm32_transfer+166> 0x0 0x68 0x...
#define CONFIG_SYS_MAX_I2C_BUS TEGRA_I2C_NUM_CONTROLLERS #define CONFIG_SYS_I2C_SPEED 100000 #define CONFIG_CMD_I2C #define CONFIG_SYS_I2C /* SD/MMC */ #define CONFIG_MMC 1 change: 1 addition & 0 deletions 1 include/configs/tegra-common.h Original file line numberDiff line numberDiff...
read logo on state from dts [1] pll_src = 0, dclk_hz = 65000000, dclk_div = 6 no fuel gauge found Hit any key to stop autoboot: 0 load fdt from resouce. ERROR: [get_entry_ram]: Cannot find logo_kernel.bmp! Secure Boot state: 0 kernel @ 0x02000000 (0x006a93c8) ...
zephyr/boards/st/nucleo_f401re/nucleo_f401re.dts &i2c1 { pinctrl-0 = <&i2c1_scl_pb8 &i2c1_sda_pb9>; pinctrl-names = "default"; status = "okay"; clock-frequency = <I2C_BITRATE_FAST>; }; 6. まとめGPIO の制御に続いて、I2C を用いたデバイス制御方法について、実装例を交えて...
Additionally, themeta-emcraft/recipes-kernel/linux/linux-imx/imx8m-som.dtsfile defines the I2C interface reference with other properties, which enable the appropriate I2C bus controller, connect it to the pins specified, select the bus speed, and define I2C devices, located on the corresponding bu...
Zooming in to the topic of I2C, we can see thatarm/boot/dts/stm32mp157c.dtsidescribes 6 I2C controllers through six different nodes in the Device Tree: i2c1: i2c@40012000 i2c2: i2c@40013000 i2c3: i2c@40014000 i2c4: i2c@5c002000 ...
DTS,DTM-DOR,PMT-48V150W2BA,DTV,DRP012V060W1AA,RS-AFS60LA01,DTM-DOV,AS324MT-A,DVP08XP211T,RS-AFS60LA06,RS-AFS60LA05,RS-AFS60LA04,PMT-24V150W2CA,LA-S8,LA-S7,DOP-107DV,DVS-G112,DRC-24V30W1AZ,LA-S4,TP04G-AL2,LA-S6,PIC-DMC-B03,LA-S5,LA-S,RTU-ECAT,DTM-DOC,CSJ,DVS...