Based on kernel version 4.16.1. Page generated on 2018-04-09 11:52 EST.
1 Samsung GPIO implementation 2 =========================== 3 4 Introduction 5 ------------ 6 7 This outlines the Samsung GPIO implementation and the architecture 8 specific calls provided alongside the drivers/gpio core. 9 10 11 S3C24XX (Legacy) 12 ---------------- 13 14 See Documentation/arm/Samsung-S3C24XX/GPIO.txt for more information 15 about these devices. Their implementation has been brought into line 16 with the core samsung implementation described in this document. 17 18 19 GPIOLIB integration 20 ------------------- 21 22 The gpio implementation uses gpiolib as much as possible, only providing 23 specific calls for the items that require Samsung specific handling, such 24 as pin special-function or pull resistor control. 25 26 GPIO numbering is synchronised between the Samsung and gpiolib system. 27 28 29 PIN configuration 30 ----------------- 31 32 Pin configuration is specific to the Samsung architecture, with each SoC 33 registering the necessary information for the core gpio configuration 34 implementation to configure pins as necessary. 35 36 The s3c_gpio_cfgpin() and s3c_gpio_setpull() provide the means for a 37 driver or machine to change gpio configuration. 38 39 See arch/arm/plat-samsung/include/plat/gpio-cfg.h for more information 40 on these functions.