linux-kernel - [PATCH V3] ALSA: machine: update documentation

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Message-Id: <20241109192231.11623-1-yesanishhere@gmail.com>
Date: Sat,  9 Nov 2024 11:22:31 -0800
From: anish kumar <yesanishhere@...il.com>
To: lgirdwood@...il.com,
	broonie@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com,
	corbet@....net
Cc: linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-sound@...r.kernel.org,
	anish kumar <yesanishhere@...il.com>
Subject: [PATCH V3] ALSA: machine: update documentation

1. Added clocking details.
2. Updated ways to register the dai's
3. Bit more detail about card registration details.

Signed-off-by: anish kumar <yesanishhere@...il.com>
---
V3:
 fixed reported warning and html machine output which
 was not formatting 'clocking controls' properly. 

V2:
 took care of comments from bagas related to underline
 and making macros as literal code block

 Documentation/sound/soc/machine.rst | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/Documentation/sound/soc/machine.rst b/Documentation/sound/soc/machine.rst
index 515c9444deaf..9db132bc0070 100644
--- a/Documentation/sound/soc/machine.rst
+++ b/Documentation/sound/soc/machine.rst
@@ -71,6 +71,18 @@ struct snd_soc_dai_link is used to set up each DAI in your machine. e.g.
 	.ops = &corgi_ops,
   };
 
+In the above struct, dai’s are registered using names but you can pass
+either dai name or device tree node but not both. Also, names used here
+for cpu/codec/platform dais should be globally unique.
+
+Additionaly below example macro can be used to register cpu, codec and
+platform dai::
+
+  SND_SOC_DAILINK_DEFS(wm2200_cpu_dsp,
+	DAILINK_COMP_ARRAY(COMP_CPU("samsung-i2s.0")),
+	DAILINK_COMP_ARRAY(COMP_CODEC("spi0.0", "wm0010-sdi1")),
+	DAILINK_COMP_ARRAY(COMP_PLATFORM("samsung-i2s.0")));
+
 struct snd_soc_card then sets up the machine with its DAIs. e.g.
 ::
 
@@ -81,6 +93,10 @@ struct snd_soc_card then sets up the machine with its DAIs. e.g.
 	.num_links = 1,
   };
 
+Following this, ``devm_snd_soc_register_card`` can be used to register
+the sound card. During the registration, the individual components
+such as the codec, CPU, and platform are probed. If all these components
+are successfully probed, the sound card gets registered.
 
 Machine Power Map
 -----------------
@@ -95,3 +111,13 @@ Machine Controls
 ----------------
 
 Machine specific audio mixer controls can be added in the DAI init function.
+
+
+Clocking Controls
+-----------------
+
+As previously noted, clock configuration is handled within the machine driver.
+For details on the clock APIs that the machine driver can utilize for
+setup, please refer to Documentation/sound/soc/clocking.rst. However, the
+callback needs to be registered by the CPU/Codec/Platform drivers to configure
+the clocks that is needed for the corresponding device operation.
-- 
2.39.3 (Apple Git-146)