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Commit 65aca64d authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Mark Brown
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ASoC: omap-mcpdm: Add support for pdmclk clock handling 



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: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 4a5c8374

Documentation/devicetree/bindings/sound/omap-mcpdm.txt

+10 −0
Original line number Diff line number Diff line
@@ -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";

};

sound/soc/omap/omap-mcpdm.c

+17 −0
Original line number Diff line number Diff line
@@ -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);