1# SPDX-License-Identifier: GPL-2.0 2config FB_OLPC_DCON 3 tristate "One Laptop Per Child Display CONtroller support" 4 depends on OLPC && FB 5 depends on I2C 6 depends on BACKLIGHT_LCD_SUPPORT 7 depends on (GPIO_CS5535 || GPIO_CS5535=n) 8 select BACKLIGHT_CLASS_DEVICE 9 help 10 In order to support very low power operation, the XO laptop uses a 11 secondary Display CONtroller, or DCON. This secondary controller 12 is present in the video pipeline between the primary display 13 controller (integrate into the processor or chipset) and the LCD 14 panel. It allows the main processor/display controller to be 15 completely powered off while still retaining an image on the display. 16 This controller is only available on OLPC platforms. Unless you have 17 one of these platforms, you will want to say 'N'. 18 19config FB_OLPC_DCON_1 20 bool "OLPC XO-1 DCON support" 21 depends on FB_OLPC_DCON && GPIO_CS5535 22 default y 23 help 24 Enable support for the DCON in XO-1 model laptops. The kernel 25 communicates with the DCON using model-specific code. If you 26 have an XO-1 (or if you're unsure what model you have), you should 27 say 'Y'. 28 29config FB_OLPC_DCON_1_5 30 bool "OLPC XO-1.5 DCON support" 31 depends on FB_OLPC_DCON && ACPI 32 default y 33 help 34 Enable support for the DCON in XO-1.5 model laptops. The kernel 35 communicates with the DCON using model-specific code. If you 36 have an XO-1.5 (or if you're unsure what model you have), you 37 should say 'Y'. 38