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Difference between revisions of "I2S Linux driver"
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Contents
1 Article purpose[edit]
This article introduces the I2S Linux® driver for the SPI/I2S internal peripheral.
2 Short Description[edit]
The I2S Linux driver is an ASoC CPU DAI driver implemented in the Linux ALSA framework.
3 Configuration[edit]
3.1 Kernel Configuration[edit]
Activate the I2S Linux driver in the kernel configuration using the Linux Menuconfig tool: 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 I2S interface (SPI/I2S block) support
3.2 Device tree[edit]
Refer to the I2S_device_tree_configuration article when configuring the I2S Linux kernel driver.
4 How to use[edit]
The I2S Linux driver can be accessed from userland through an ALSA device. Refer to ALSA overview for information on how to list and use ALSA devices.
5 How to trace and debug[edit]
The debugfs and procfs file system can be checked to get information on the I2S driver and the resources it uses. A non-exhaustive list of these file system entries is provided below. Refer to ALSA overview for more details on 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 SPI/I2S 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
6 Source code location[edit]
sound/soc/stm/stm32_i2s.c : implements the I2S Linux driver.
7 References[edit]
<noinclude> {{ArticleBasedOnModel | [[Linux driver article model]]}} {{ArticleMainWriter | OlivierM}} {{ArticleApprovedVersion | OlivierM | ArnaudP(Pass, 14/01/2019) | No previous approved version | BrunoB - 29Jan'19 - 10338 | 29Jan'19}} [[Category:ALSA]]</noinclude> == Article purpose == This article introduces the I2S Linux<sup>®</sup> driver for the [[SPI internal peripheral|SPI/I2S internal peripheral]]. == Short Description == The I2S Linux driver is an ASoC CPU DAI driver implemented in the Linux [[ALSA_overview|ALSA framework]]. == Configuration == === Kernel Configuration === Activate the I2S Linux driver in the kernel configuration using the Linux Menuconfig tool: [[Menuconfig or how to configure kernel]].<pre> [*] Device Drivers [*] Sound card support [*] Advanced Linux Sound Architecture [*] ALSA for SoC audio support STMicroelectronics STM32 SOC audio support [*] STM32 I2S interface (SPI/I2S block) support</pre> === Device tree === Refer to the [[I2S _device _tree _configuration]] article when configuring the I2S Linux kernel driver. {{ReviewsComments| olivierM w902: Device tree configuration to be detailed in specific article}} == How to use == The I2S Linux driver can be accessed from userland through an ALSA device. Refer to [[ALSA_overview#How_to_use|ALSA overview]] for information on how to list and use ALSA devices. ==How to trace and debug== The [[Debugfs|debugfs]] and procfs file system can be checked to get information on the I2S driver and the resources it uses. A non-exhaustive list of these file system entries is provided below. Refer to [[ALSA_overview#How_to_trace_and_debug_the_framework|ALSA overview]] for more details on 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 SPI/I2S peripheral registers.<div style="margin-left: 2em;"> $ cat /sys/kernel/debug/regmap/xxx.audio-controller/registers</div> * procfs entries: :* '''asound''': refer to [[ALSA_overview#How_to_debug]] :* '''interrupts''': allow to check interrupts.<div style="margin-left: 2em;"> $ cat /proc/interrupts</div> == Source code location == {{CodeSource | Linux kernel | sound/soc/stm/stm32_i2s.c}}: implements the I2S Linux driver. ==References==<references />
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=== Device tree === |
=== Device tree === |
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+ | Refer to the [[I2S_device_tree_configuration]] article when configuring the I2S Linux kernel driver. |
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== How to use == |
== How to use == |
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