SPDIFRX Linux driver
目录
Article purpose
本文介绍了适用于SPDIFRX internal peripheral的SPDIFRX Linux®驱动程序。
Short Description
SPDIFRX[1] Linux 驱动程序是在LinuxALSA framework中实现的ASoC CPU DAI驱动程序。
Configuration
Kernel Configuration
使用Linux Menuconfig工具在内核配置中激活SPDIFRX[1] Linux驱动程序： Menuconfig or how to configure kernel
[*] Device Drivers
[*] Sound card support
[*] Advanced Linux Sound Architecture
[*] ALSA for SoC audio support
STMicroelectronics STM32 SOC audio support
[*] STM32 S/PDIF receiver (SPDIFRX) support
Device tree
配置SPDIFRX Linux内核驱动程序时，请参考SPDIFRX device tree configuration 。
How to use
可通过ALSA设备从用户区访问SPDIFRX驱动程序。 请参阅ALSA overview ，以了解如何列出和使用ALSA设备。
SPDFIRX驱动程序公开了一个alsa控件，该控件允许从输入音频流中检索IEC958状态位。
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设备树中SPDIFRX输入引脚的配置可能会对IEC958控制的使用施加一些限制。因此，在某些配置中，仅当捕获音频流时才能使用控件。有关SPDIFRX配置的详细信息，请参阅SPDIFRX device tree configuration。 |
How to debug
The 调试文件系统(debugfs) and procfs file systems can be checked to get information about the SPDFIRX driver and the resources it uses. A none exhaustive list of these file system entries is provided below. Refer to ALSA overview to get more details about debugging tools.
- debugfs entries:
- asoc: refer to ALSA_overview#How_to_monitor
- clk: refer to Clock_overview#How_to_monitor_with_debugfs to get information on clocks.
- pinctrl: refer to Pinctrl_overview#How_to_monitor to get information on pins.
- regmap: allow to monitor SPDIFRX peripheral registers.
$ cat /sys/kernel/debug/regmap/xxx.audio-controller/registers
- procfs entries:
- asound: refer to ALSA_overview#How_to_debug
- interrupts: allow to check interrupts.
$ cat /proc/interrupts
Source code location
sound/soc/stm/stm32_spdifrx.c| |}} sound/soc/stm/stm32_spdifrx.c : implements the SPDIFRX driver.
