leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ASoC: davinci-evm: Add named clock reference to DT bindings

Browse Source 
The referenced clock is used to get codec clock rate and the clock is
disabled and enabled in startup and shutdown snd_soc_ops call
backs. The change is also documented in DT bindigs document.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
cc: bcousson@baylibre.com
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Jyri Sarha 2014-01-27 17:37:51 +02:00 committed by Mark Brown
parent 7552f34a79
commit 5ad8865b00
2 changed files with 64 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Documentation/devicetree/bindings/sound/davinci-evm-audio.txt
View File

@ -5,12 +5,19 @@ Required properties:
- ti,model : The user-visible name of this sound complex.
- ti,audio-codec : The phandle of the TLV320AIC3x audio codec
- ti,mcasp-controller : The phandle of the McASP controller
- ti,codec-clock-rate : The Codec Clock rate (in Hz) applied to the Codec
- ti,audio-routing : A list of the connections between audio components.
Each entry is a pair of strings, the first being the connection's sink,
the second being the connection's source. Valid names for sources and
sinks are the codec's pins, and the jacks on the board:
Optional properties:
- ti,codec-clock-rate : The Codec Clock rate (in Hz) applied to the Codec.
- clocks : Reference to the master clock
- clock-names : The clock should be named "mclk"
- Either codec-clock-rate or the codec-clock reference has to be defined. If
the both are defined the driver attempts to set referenced clock to the
defined rate and takes the rate from the clock reference.
Board connectors:
* Headphone Jack

58
sound/soc/davinci/davinci-evm.c
View File

@ -17,6 +17,7 @@
#include <linux/platform_data/edma.h>
#include <linux/i2c.h>
#include <linux/of_platform.h>
#include <linux/clk.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
@ -30,9 +31,34 @@
#include "davinci-i2s.h"
struct snd_soc_card_drvdata_davinci {
struct clk *mclk;
unsigned sysclk;
};
static int evm_startup(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_card *soc_card = rtd->codec->card;
struct snd_soc_card_drvdata_davinci *drvdata =
snd_soc_card_get_drvdata(soc_card);
if (drvdata->mclk)
return clk_prepare_enable(drvdata->mclk);
return 0;
}
static void evm_shutdown(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_card *soc_card = rtd->codec->card;
struct snd_soc_card_drvdata_davinci *drvdata =
snd_soc_card_get_drvdata(soc_card);
if (drvdata->mclk)
clk_disable_unprepare(drvdata->mclk);
}
static int evm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
@ -59,6 +85,8 @@ static int evm_hw_params(struct snd_pcm_substream *substream,
}
static struct snd_soc_ops evm_ops = {
.startup = evm_startup,
.shutdown = evm_shutdown,
.hw_params = evm_hw_params,
};
@ -348,6 +376,7 @@ static int davinci_evm_probe(struct platform_device *pdev)
of_match_device(of_match_ptr(davinci_evm_dt_ids), &pdev->dev);
struct snd_soc_dai_link *dai = (struct snd_soc_dai_link *) match->data;
struct snd_soc_card_drvdata_davinci *drvdata = NULL;
struct clk *mclk;
int ret = 0;
evm_soc_card.dai_link = dai;
@ -367,13 +396,38 @@ static int davinci_evm_probe(struct platform_device *pdev)
if (ret)
return ret;
mclk = devm_clk_get(&pdev->dev, "mclk");
if (PTR_ERR(mclk) == -EPROBE_DEFER) {
return -EPROBE_DEFER;
} else if (IS_ERR(mclk)) {
dev_dbg(&pdev->dev, "mclk not found.\n");
mclk = NULL;
}
drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->mclk = mclk;
ret = of_property_read_u32(np, "ti,codec-clock-rate", &drvdata->sysclk);
if (ret < 0)
return -EINVAL;
if (ret < 0) {
if (!drvdata->mclk) {
dev_err(&pdev->dev,
"No clock or clock rate defined.\n");
return -EINVAL;
}
drvdata->sysclk = clk_get_rate(drvdata->mclk);
} else if (drvdata->mclk) {
unsigned int requestd_rate = drvdata->sysclk;
clk_set_rate(drvdata->mclk, drvdata->sysclk);
drvdata->sysclk = clk_get_rate(drvdata->mclk);
if (drvdata->sysclk != requestd_rate)
dev_warn(&pdev->dev,
"Could not get requested rate %u using %u.\n",
requestd_rate, drvdata->sysclk);
}
snd_soc_card_set_drvdata(&evm_soc_card, drvdata);
ret = devm_snd_soc_register_card(&pdev->dev, &evm_soc_card);