.. SPDX-License-Identifier: GPL-2.0+: .. index:: single: dm (command) dm command ========== Synopsis -------- :: dm compat dm devres dm drivers dm static dm tree [-s][-e] [uclass name] dm uclass [-e] [udevice name] Description ----------- The *dm* command allows viewing information about driver model, including the tree of devices and list of available uclasses. dm compat ~~~~~~~~~ This shows the compatible strings associated with each driver. Often there is only one, but multiple strings are shown on their own line. These strings can be looked up in the device tree files for each board, to see which driver is used for each node. dm devres ~~~~~~~~~ This shows a list of a `devres` (device resource) records for a device. Some drivers use the devres API to allocate memory, so that it can be freed automatically (without any code needed in the driver's remove() method) when the device is removed. This feature is controlled by CONFIG_DEVRES so no useful output is obtained if this option is disabled. dm drivers ~~~~~~~~~~ This shows all the available drivers, their uclass and a list of devices that use that driver, each on its own line. Drivers with no devices are shown with `` as the driver name. dm mem ~~~~~~ This subcommand is really just for debugging and exploration. It can be enabled with the `CONFIG_DM_STATS` option. All output is in hex except that in brackets which is decimal. The output consists of a header shows the size of the main device model structures (struct udevice, struct driver, struct uclass and struct uc_driver) and the count and memory used by each (number of devices, memory used by devices, memory used by device names, number of uclasses, memory used by uclasses). After that is a table of information about each type of data that can be attached to a device, showing the number that have non-null data for that type, the total size of all that data, the amount of memory used in total, the amount that would be used if this type uses tags instead and the amount that would be thus saved. The `driver_data` line shows the number of devices which have non-NULL driver data. The `tags` line shows the number of tags and the memory used by those. At the bottom is an indication of the total memory usage obtained by undertaking various changes, none of which is currently implemented in U-Boot: With tags Using tags instead of all attached types Singly linked Using a singly linked list driver index Using a driver index instead of a pointer uclass index Using a uclass index instead of a pointer Drop device name Using empty device names dm static ~~~~~~~~~ This shows devices bound by platform data, i.e. not from the device tree. There are normally none of these, but some boards may use static devices for space reasons. dm tree ~~~~~~~ This shows the full tree of devices including the following fields: uclass Shows the name of the uclass for the device Index Shows the index number of the device, within the uclass. This shows the ordering within the uclass, but not the sequence number. Probed Shows `+` if the device is active Driver Shows the name of the driver that this device uses Name Shows the device name as well as the tree structure, since child devices are shown attached to their parent. If -s is given, the top-level devices (those which are children of the root device) are shown sorted in order of uclass ID, so it is easier to find a particular device type. If -e is given, forward-matching against existing devices is made and only the matched devices are shown. If a device name is given, forward-matching against existing devices is made and only the matched devices are shown. dm uclass ~~~~~~~~~ This shows each uclass along with a list of devices in that uclass. The uclass ID is shown (e.g. uclass 7) and its name. For each device, the format is:: n name @ a, seq s where `n` is the index within the uclass, `a` is the address of the device in memory and `s` is the sequence number of the device. If -e is given, forward-matching against existing uclasses is made and only the matched uclasses are shown. If no uclass name is given, all the uclasses are shown. Examples -------- dm compat ~~~~~~~~~ This example shows an abridged version of the sandbox output:: => dm compat Driver Compatible -------------------------------- act8846_reg sandbox_adder sandbox,adder axi_sandbox_bus sandbox,axi blk_partition bootcount-rtc u-boot,bootcount-rtc ... rockchip_rk805 rockchip,rk805 rockchip,rk808 rockchip,rk809 rockchip,rk816 rockchip,rk817 rockchip,rk818 root_driver rtc-rv8803 microcrystal,rv8803 epson,rx8803 epson,rx8900 ... wdt_gpio linux,wdt-gpio wdt_sandbox sandbox,wdt dm devres ~~~~~~~~~ This example shows an abridged version of the sandbox test output (running U-Boot with the -T flag):: => dm devres - root_driver - demo_shape_drv - demo_simple_drv - demo_shape_drv ... - h-test - devres-test 00000000130194e0 (100 byte) devm_kmalloc_release BIND - another-test ... - syscon@3 - a-mux-controller 0000000013025e60 (96 byte) devm_kmalloc_release PROBE 0000000013025f00 (24 byte) devm_kmalloc_release PROBE 0000000013026010 (24 byte) devm_kmalloc_release PROBE 0000000013026070 (24 byte) devm_kmalloc_release PROBE 00000000130260d0 (24 byte) devm_kmalloc_release PROBE - syscon@3 - a-mux-controller 0000000013026150 (96 byte) devm_kmalloc_release PROBE 00000000130261f0 (24 byte) devm_kmalloc_release PROBE 0000000013026300 (24 byte) devm_kmalloc_release PROBE 0000000013026360 (24 byte) devm_kmalloc_release PROBE 00000000130263c0 (24 byte) devm_kmalloc_release PROBE - emul-mux-controller 0000000013025fa0 (32 byte) devm_kmalloc_release PROBE - testfdtm0 - testfdtm1 ... - pinmux_spi0_pins - pinmux_uart0_pins - pinctrl-single-bits 0000000013229180 (320 byte) devm_kmalloc_release PROBE 0000000013229300 (40 byte) devm_kmalloc_release PROBE 0000000013229370 (160 byte) devm_kmalloc_release PROBE 000000001322c190 (40 byte) devm_kmalloc_release PROBE 000000001322c200 (32 byte) devm_kmalloc_release PROBE - pinmux_i2c0_pins ... - reg@0 - reg@1 dm drivers ~~~~~~~~~~ This example shows an abridged version of the sandbox output:: => dm drivers Driver uid uclass Devices ---------------------------------------------------------- act8846_reg 087 regulator sandbox_adder 021 axi adder adder axi_sandbox_bus 021 axi axi@0 ... da7219 061 misc demo_shape_drv 001 demo demo_shape_drv demo_shape_drv demo_shape_drv demo_simple_drv 001 demo demo_simple_drv demo_simple_drv testfdt_drv 003 testfdt a-test b-test d-test e-test f-test g-test another-test chosen-test testbus_drv 005 testbus some-bus mmio-bus@0 mmio-bus@1 dsa-port 039 ethernet lan0 lan1 dsa_sandbox 035 dsa dsa-test eep_sandbox 121 w1_eeprom ... pfuze100_regulator 087 regulator phy_sandbox 077 phy bind-test-child1 gen_phy@0 gen_phy@1 gen_phy@2 pinconfig 078 pinconfig gpios gpio0 gpio1 gpio2 gpio3 i2c groups pins i2s spi cs pinmux_pwm_pins pinmux_spi0_pins pinmux_uart0_pins pinmux_i2c0_pins pinmux_lcd_pins pmc_sandbox 017 power-mgr pci@1e,0 act8846 pmic 080 pmic max77686_pmic 080 pmic mc34708_pmic 080 pmic pmic@41 ... wdt_gpio 122 watchdog gpio-wdt wdt_sandbox 122 watchdog wdt@0 => dm mem ~~~~~~ This example shows the sandbox output:: > dm mem Struct sizes: udevice b0, driver 80, uclass 30, uc_driver 78 Memory: device fe:aea0, device names a16, uclass 5e:11a0 Attached type Count Size Cur Tags Save --------------- ----- ----- ----- ----- ----- plat 45 a8f aea0 a7c4 6dc (1756) parent_plat 1a 3b8 aea0 a718 788 (1928) uclass_plat 3d 6b4 aea0 a7a4 6fc (1788) priv 8a 68f3 aea0 a8d8 5c8 (1480) parent_priv 8 38a0 aea0 a6d0 7d0 (2000) uclass_priv 4e 14a6 aea0 a7e8 6b8 (1720) driver_data f 0 aea0 a6ec 7b4 (1972) uclass 6 20 Attached total 191 cb54 3164 (12644) tags 0 0 Total size: 18b94 (101268) With tags: 15a30 (88624) - singly-linked: 14260 (82528) - driver index: 13b6e (80750) - uclass index: 1347c (78972) Drop device name (not SRAM): a16 (2582) => dm static ~~~~~~~~~ This example shows the sandbox output:: => dm static Driver Address --------------------------------- demo_shape_drv 0000562edab8dca0 demo_simple_drv 0000562edab8dca0 demo_shape_drv 0000562edab8dc90 demo_simple_drv 0000562edab8dc80 demo_shape_drv 0000562edab8dc80 test_drv 0000562edaae8840 test_drv 0000562edaae8848 test_drv 0000562edaae8850 sandbox_gpio 0000000000000000 mod_exp_sw 0000000000000000 sandbox_test_proc 0000562edabb5330 qfw_sandbox 0000000000000000 sandbox_timer 0000000000000000 sandbox_serial 0000562edaa8ed00 sysreset_sandbox 0000000000000000 dm tree ------- This example shows the abridged sandbox output:: => dm tree Class Index Probed Driver Name ----------------------------------------------------------- root 0 [ + ] root_driver root_driver demo 0 [ ] demo_shape_drv |-- demo_shape_drv demo 1 [ ] demo_simple_drv |-- demo_simple_drv demo 2 [ ] demo_shape_drv |-- demo_shape_drv demo 3 [ ] demo_simple_drv |-- demo_simple_drv demo 4 [ ] demo_shape_drv |-- demo_shape_drv test 0 [ ] test_drv |-- test_drv test 1 [ ] test_drv |-- test_drv test 2 [ ] test_drv |-- test_drv .. sysreset 0 [ ] sysreset_sandbox |-- sysreset_sandbox bootstd 0 [ ] bootstd_drv |-- bootstd bootmeth 0 [ ] bootmeth_extlinux | |-- extlinux bootmeth 1 [ ] bootmeth_efi | `-- efi reboot-mod 0 [ ] reboot-mode-gpio |-- reboot-mode0 reboot-mod 1 [ ] reboot-mode-rtc |-- reboot-mode@14 ... ethernet 7 [ + ] dsa-port | `-- lan1 pinctrl 0 [ + ] sandbox_pinctrl_gpio |-- pinctrl-gpio gpio 1 [ + ] sandbox_gpio | |-- base-gpios nop 0 [ + ] gpio_hog | | |-- hog_input_active_low nop 1 [ + ] gpio_hog | | |-- hog_input_active_high nop 2 [ + ] gpio_hog | | |-- hog_output_low nop 3 [ + ] gpio_hog | | `-- hog_output_high gpio 2 [ ] sandbox_gpio | |-- extra-gpios gpio 3 [ ] sandbox_gpio | `-- pinmux-gpios i2c 0 [ + ] sandbox_i2c |-- i2c@0 i2c_eeprom 0 [ ] i2c_eeprom | |-- eeprom@2c i2c_eeprom 1 [ ] i2c_eeprom_partition | | `-- bootcount@10 rtc 0 [ ] sandbox_rtc | |-- rtc@43 rtc 1 [ + ] sandbox_rtc | |-- rtc@61 i2c_emul_p 0 [ + ] sandbox_i2c_emul_par | |-- emul i2c_emul 0 [ ] sandbox_i2c_eeprom_e | | |-- emul-eeprom i2c_emul 1 [ ] sandbox_i2c_rtc_emul | | |-- emul0 i2c_emul 2 [ + ] sandbox_i2c_rtc_emul | | |-- emull i2c_emul 3 [ ] sandbox_i2c_pmic_emu | | |-- pmic-emul0 i2c_emul 4 [ ] sandbox_i2c_pmic_emu | | `-- pmic-emul1 pmic 0 [ ] sandbox_pmic | |-- sandbox_pmic regulator 0 [ ] sandbox_buck | | |-- buck1 regulator 1 [ ] sandbox_buck | | |-- buck2 regulator 2 [ ] sandbox_ldo | | |-- ldo1 regulator 3 [ ] sandbox_ldo | | |-- ldo2 regulator 4 [ ] sandbox_buck | | `-- no_match_by_nodename pmic 1 [ ] mc34708_pmic | `-- pmic@41 bootcount 0 [ + ] bootcount-rtc |-- bootcount@0 bootcount 1 [ ] bootcount-i2c-eeprom |-- bootcount ... clk 4 [ ] fixed_clock |-- osc firmware 0 [ ] sandbox_firmware |-- sandbox-firmware scmi_agent 0 [ ] sandbox-scmi_agent `-- scmi clk 5 [ ] scmi_clk |-- protocol@14 reset 2 [ ] scmi_reset_domain |-- protocol@16 nop 8 [ ] scmi_voltage_domain `-- regulators regulator 5 [ ] scmi_regulator |-- reg@0 regulator 6 [ ] scmi_regulator `-- reg@1 => dm tree pinc pinctrl 0 [ + ] sandbox_pinctrl_gpio pinctrl-gpio gpio 1 [ + ] sandbox_gpio |-- base-gpios nop 0 [ + ] gpio_hog | |-- hog_input_active_low nop 1 [ + ] gpio_hog | |-- hog_input_active_high nop 2 [ + ] gpio_hog | |-- hog_output_low nop 3 [ + ] gpio_hog | `-- hog_output_high gpio 2 [ ] sandbox_gpio |-- extra-gpios gpio 3 [ ] sandbox_gpio `-- pinmux-gpios => dm uclass ~~~~~~~~~ This example shows the abridged sandbox output:: => dm uclass uclass 0: root 0 * root_driver @ 03015460, seq 0 uclass 1: demo 0 demo_shape_drv @ 03015560, seq 0 1 demo_simple_drv @ 03015620, seq 1 2 demo_shape_drv @ 030156e0, seq 2 3 demo_simple_drv @ 030157a0, seq 3 4 demo_shape_drv @ 03015860, seq 4 uclass 2: test 0 test_drv @ 03015980, seq 0 1 test_drv @ 03015a60, seq 1 2 test_drv @ 03015b40, seq 2 ... uclass 20: audio-codec 0 audio-codec @ 030168e0, seq 0 uclass 21: axi 0 adder @ 0301db60, seq 1 1 adder @ 0301dc40, seq 2 2 axi@0 @ 030217d0, seq 0 uclass 22: blk 0 mmc2.blk @ 0301ca00, seq 0 1 mmc1.blk @ 0301cee0, seq 1 2 mmc0.blk @ 0301d380, seq 2 uclass 23: bootcount 0 * bootcount@0 @ 0301b3f0, seq 0 1 bootcount @ 0301b4b0, seq 1 2 bootcount_4@0 @ 0301b570, seq 2 3 bootcount_2@0 @ 0301b630, seq 3 uclass 24: bootdev 0 mmc2.bootdev @ 0301cbb0, seq 0 1 mmc1.bootdev @ 0301d050, seq 1 2 mmc0.bootdev @ 0301d4f0, seq 2 ... uclass 78: pinconfig 0 gpios @ 03022410, seq 0 1 gpio0 @ 030224d0, seq 1 2 gpio1 @ 03022590, seq 2 3 gpio2 @ 03022650, seq 3 4 gpio3 @ 03022710, seq 4 5 i2c @ 030227d0, seq 5 6 groups @ 03022890, seq 6 7 pins @ 03022950, seq 7 8 i2s @ 03022a10, seq 8 9 spi @ 03022ad0, seq 9 10 cs @ 03022b90, seq 10 11 pinmux_pwm_pins @ 03022e10, seq 11 12 pinmux_spi0_pins @ 03022ed0, seq 12 13 pinmux_uart0_pins @ 03022f90, seq 13 14 * pinmux_i2c0_pins @ 03023130, seq 14 15 * pinmux_lcd_pins @ 030231f0, seq 15 ... uclass 119: virtio 0 sandbox_virtio1 @ 030220d0, seq 0 1 sandbox_virtio2 @ 03022190, seq 1 uclass 120: w1 uclass 121: w1_eeprom uclass 122: watchdog 0 * gpio-wdt @ 0301c070, seq 0 1 * wdt@0 @ 03021710, seq 1 => dm uclass blk uclass 22: blk 0 mmc2.blk @ 0301ca00, seq 0 1 mmc1.blk @ 0301cee0, seq 1 2 mmc0.blk @ 0301d380, seq 2 =>