Nettetdevice driver在操作设备的clock之前，需要先获取和该clock关联的struct clk指针，获取的接口如下： 1: struct clk *clk_get (struct device *dev, const char *id); 2: struct clk *devm_clk_get (struct device *dev, const char *id); 3: void clk_put (struct clk *clk); 4: void devm_clk_put (struct device *dev, struct clk *clk); NettetI A clock framework has been available for many years (it comes from the prehistory of git) I O ers a a simple API: clk_get, clk_enable, clk_get_rate, clk_set_rate, clk_disable, …
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Nettet24. jun. 2013 · 1 Answer Sorted by: 6 Clocks may need PLLs to be set up and locked, voltage OPP to be set, or other prerequisite actions before clk_enable. For example: drivers/clk/clk-highbank.c clk_pll_prepare () This routine has wait loops that spin until the hardware PLL shows lock. Can't do that from an atomic context. NettetGrep LX kernel code for clocking api keywords for more info how to use LX kernel clocking framework. One way to get reference to desired clock is via device tree e.g: ``` my … falling wedge price target
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Nettet这些注册函数最终都会通过函数 clk_register 注册到 Common Clock Framework 中，返回为 struct clk 指针。 如下所示： 然后将返回的 struct clk 指针，保存在一个数组中，并调用 of_clk_add_provider 接口，告知 Common Clock Framework。 NettetThe Common Clk Framework¶ Author. Mike Turquette This document endeavours to explain the common clk framework details, and how to port a platform over to this framework. It is not yet a detailed explanation of the clock api in include/linux/clk.h, but perhaps someday it will include that information. Nettet1. sep. 2016 · The MIPI CCS camera sensor driver is a generic driver for MIPI CCS compliant camera sensors. It exposes three sub-devices representing the pixel array, the binner and the scaler. As the capabilities of individual devices vary, the driver exposes interfaces based on the capabilities that exist in hardware. 9.1.16.1. Pixel Array sub … falling wedge technical analysis