关于am335x-evm-scale-data.bin

Lihua Zhu

Intellectual 330 points

在内核的设备树文件中，有这样一段：

&wkup_m3_ipc {

ti, needs-vtt-toggle;

ti,vtt-gpio-pin = <7>;
ti,scale-data-fw = "am335x-evm-scale-data.bin";
};

请教几个问题：

1、wkup_m3_ipc是描述什么的？我在TRM中没有找到具体的说明

2、am335x-evm-scale-data.bin的内容是什么？主要起什么作用？

3、wkup_m3_ipc与am335x-evm-scale-data.bin有什么关联？

谢谢各位！

6 年多前

0 Shine 6 年多前

TI__Guru**** 357097 points

1. 这个节点对应wkup_m3_ipc Driver
This driver exposes an API to be used by the PM code to provide board and SoC specific data from the kernel to the CM3 firmware, request certain power state transitions, and query the status of any previous power state transitions performed by the CM3 firmware.

2. 这个实现Deep Sleep Voltage Scaling

3. In order to enable deep sleep voltage scaling, the CM3 module needs to be told which binary blob to execute during a suspend/ resume cycle. This is defined in the wkup_m3_ipc node.
/* From arch/arm/boot/dts/am335x-evm.dts */
&wkup_m3_ipc {
ti,scale-data-fw = "am335x-evm-scale-data.bin";

这些都在下面的文档有说明。
www.ti.com/.../sprac74a.pdf