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ASoC: omap-mcpdm: Add support for pdmclk clock handling

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McPDM module receives it's functional clock from external source. This
clock is the pdmclk provided by the twl6040 audio IC. If the clock is not
available all register accesses to McPDM fails and the module is not
operational.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Peter Ujfalusi 2016-05-18 16:46:36 +03:00 committed by Mark Brown
parent 4a5c83744f
commit 65aca64d05
2 changed files with 27 additions and 0 deletions
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10
Documentation/devicetree/bindings/sound/omap-mcpdm.txt
View File

@ -8,6 +8,8 @@ Required properties:
- interrupts: Interrupt number for McPDM
- interrupt-parent: The parent interrupt controller
- ti,hwmods: Name of the hwmod associated to the McPDM
- clocks: phandle for the pdmclk provider, likely <&twl6040>
- clock-names: Must be "pdmclk"
Example:
@ -19,3 +21,11 @@ mcpdm: mcpdm@40132000 {
interrupt-parent = <&gic>;
ti,hwmods = "mcpdm";
};
In board DTS file the pdmclk needs to be added:
&mcpdm {
clocks = <&twl6040>;
clock-names = "pdmclk";
status = "okay";
};

17
sound/soc/omap/omap-mcpdm.c
View File

@ -31,6 +31,7 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/of_device.h>
@ -54,6 +55,7 @@ struct omap_mcpdm {
unsigned long phys_base;
void __iomem *io_base;
int irq;
struct clk *pdmclk;
struct mutex mutex;
@ -388,6 +390,7 @@ static int omap_mcpdm_probe(struct snd_soc_dai *dai)
struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
int ret;
clk_prepare_enable(mcpdm->pdmclk);
pm_runtime_enable(mcpdm->dev);
/* Disable lines while request is ongoing */
@ -422,6 +425,7 @@ static int omap_mcpdm_remove(struct snd_soc_dai *dai)
pm_runtime_disable(mcpdm->dev);
clk_disable_unprepare(mcpdm->pdmclk);
return 0;
}
@ -441,6 +445,8 @@ static int omap_mcpdm_suspend(struct snd_soc_dai *dai)
mcpdm->pm_active_count++;
}
clk_disable_unprepare(mcpdm->pdmclk);
return 0;
}
@ -448,6 +454,8 @@ static int omap_mcpdm_resume(struct snd_soc_dai *dai)
{
struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
clk_prepare_enable(mcpdm->pdmclk);
if (mcpdm->pm_active_count) {
while (mcpdm->pm_active_count--)
pm_runtime_get_sync(mcpdm->dev);
@ -541,6 +549,15 @@ static int asoc_mcpdm_probe(struct platform_device *pdev)
mcpdm->dev = &pdev->dev;
mcpdm->pdmclk = devm_clk_get(&pdev->dev, "pdmclk");
if (IS_ERR(mcpdm->pdmclk)) {
if (PTR_ERR(mcpdm->pdmclk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_warn(&pdev->dev, "Error getting pdmclk (%ld)!\n",
PTR_ERR(mcpdm->pdmclk));
mcpdm->pdmclk = NULL;
}
ret = devm_snd_soc_register_component(&pdev->dev,
&omap_mcpdm_component,
&omap_mcpdm_dai, 1);