Commit 3bde6888c0d74d716af7381c2ad9faee77aaec8f
Committed by
Tom Rini
Tom Rini
1 parent
90b7caaf55
Exists in
v2017.01-smarct4x
and in
37 other branches
README: remove description about driver model configuration options (again)
The Driver Model description in README was removed by commit 65eb659e56fa (README: remove description about driver model configuration options), and was revived by mistake by commit b79dadf846e5 when resolving the conflict. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Tom Rini <trini@konsulko.com> Acked-by: Simon Glass <sjg@chromium.org>
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README
| ... | ... | @@ -705,119 +705,6 @@ |
| 705 | 705 | impossible actions will be skipped if the CPU is in NS mode, |
| 706 | 706 | such as ARM architectural timer initialization. |
| 707 | 707 | |
| 708 | -- Driver Model | |
| 709 | - Driver model is a new framework for devices in U-Boot | |
| 710 | - introduced in early 2014. U-Boot is being progressively | |
| 711 | - moved over to this. It offers a consistent device structure, | |
| 712 | - supports grouping devices into classes and has built-in | |
| 713 | - handling of platform data and device tree. | |
| 714 | - | |
| 715 | - To enable transition to driver model in a relatively | |
| 716 | - painful fashion, each subsystem can be independently | |
| 717 | - switched between the legacy/ad-hoc approach and the new | |
| 718 | - driver model using the options below. Also, many uclass | |
| 719 | - interfaces include compatibility features which may be | |
| 720 | - removed once the conversion of that subsystem is complete. | |
| 721 | - As a result, the API provided by the subsystem may in fact | |
| 722 | - not change with driver model. | |
| 723 | - | |
| 724 | - See doc/driver-model/README.txt for more information. | |
| 725 | - | |
| 726 | - CONFIG_DM | |
| 727 | - | |
| 728 | - Enable driver model. This brings in the core support, | |
| 729 | - including scanning of platform data on start-up. If | |
| 730 | - CONFIG_OF_CONTROL is enabled, the device tree will be | |
| 731 | - scanned also when available. | |
| 732 | - | |
| 733 | - CONFIG_CMD_DM | |
| 734 | - | |
| 735 | - Enable driver model test commands. These allow you to print | |
| 736 | - out the driver model tree and the uclasses. | |
| 737 | - | |
| 738 | - CONFIG_DM_DEMO | |
| 739 | - | |
| 740 | - Enable some demo devices and the 'demo' command. These are | |
| 741 | - really only useful for playing around while trying to | |
| 742 | - understand driver model in sandbox. | |
| 743 | - | |
| 744 | - CONFIG_SPL_DM | |
| 745 | - | |
| 746 | - Enable driver model in SPL. You will need to provide a | |
| 747 | - suitable malloc() implementation. If you are not using the | |
| 748 | - full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START, | |
| 749 | - consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you | |
| 750 | - must provide CONFIG_SYS_MALLOC_F_LEN to set the size. | |
| 751 | - In most cases driver model will only allocate a few uclasses | |
| 752 | - and devices in SPL, so 1KB should be enable. See | |
| 753 | - CONFIG_SYS_MALLOC_F_LEN for more details on how to enable | |
| 754 | - it. | |
| 755 | - | |
| 756 | - CONFIG_DM_SERIAL | |
| 757 | - | |
| 758 | - Enable driver model for serial. This replaces | |
| 759 | - drivers/serial/serial.c with the serial uclass, which | |
| 760 | - implements serial_putc() etc. The uclass interface is | |
| 761 | - defined in include/serial.h. | |
| 762 | - | |
| 763 | - CONFIG_DM_GPIO | |
| 764 | - | |
| 765 | - Enable driver model for GPIO access. The standard GPIO | |
| 766 | - interface (gpio_get_value(), etc.) is then implemented by | |
| 767 | - the GPIO uclass. Drivers provide methods to query the | |
| 768 | - particular GPIOs that they provide. The uclass interface | |
| 769 | - is defined in include/asm-generic/gpio.h. | |
| 770 | - | |
| 771 | - CONFIG_DM_SPI | |
| 772 | - | |
| 773 | - Enable driver model for SPI. The SPI slave interface | |
| 774 | - (spi_setup_slave(), spi_xfer(), etc.) is then implemented by | |
| 775 | - the SPI uclass. Drivers provide methods to access the SPI | |
| 776 | - buses that they control. The uclass interface is defined in | |
| 777 | - include/spi.h. The existing spi_slave structure is attached | |
| 778 | - as 'parent data' to every slave on each bus. Slaves | |
| 779 | - typically use driver-private data instead of extending the | |
| 780 | - spi_slave structure. | |
| 781 | - | |
| 782 | - CONFIG_DM_SPI_FLASH | |
| 783 | - | |
| 784 | - Enable driver model for SPI flash. This SPI flash interface | |
| 785 | - (spi_flash_probe(), spi_flash_write(), etc.) is then | |
| 786 | - implemented by the SPI flash uclass. There is one standard | |
| 787 | - SPI flash driver which knows how to probe most chips | |
| 788 | - supported by U-Boot. The uclass interface is defined in | |
| 789 | - include/spi_flash.h, but is currently fully compatible | |
| 790 | - with the old interface to avoid confusion and duplication | |
| 791 | - during the transition parent. SPI and SPI flash must be | |
| 792 | - enabled together (it is not possible to use driver model | |
| 793 | - for one and not the other). | |
| 794 | - | |
| 795 | - CONFIG_DM_CROS_EC | |
| 796 | - | |
| 797 | - Enable driver model for the Chrome OS EC interface. This | |
| 798 | - allows the cros_ec SPI driver to operate with CONFIG_DM_SPI | |
| 799 | - but otherwise makes few changes. Since cros_ec also supports | |
| 800 | - I2C and LPC (which don't support driver model yet), a full | |
| 801 | - conversion is not yet possible. | |
| 802 | - | |
| 803 | - | |
| 804 | - ** Code size options: The following options are enabled by | |
| 805 | - default except in SPL. Enable them explicitly to get these | |
| 806 | - features in SPL. | |
| 807 | - | |
| 808 | - CONFIG_DM_WARN | |
| 809 | - | |
| 810 | - Enable the dm_warn() function. This can use up quite a bit | |
| 811 | - of space for its strings. | |
| 812 | - | |
| 813 | - CONFIG_DM_STDIO | |
| 814 | - | |
| 815 | - Enable registering a serial device with the stdio library. | |
| 816 | - | |
| 817 | - CONFIG_DM_DEVICE_REMOVE | |
| 818 | - | |
| 819 | - Enable removing of devices. | |
| 820 | - | |
| 821 | 708 | - Linux Kernel Interface: |
| 822 | 709 | CONFIG_CLOCKS_IN_MHZ |
| 823 | 710 |