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: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/Documentation/devicetree/bindings/sound/omap-mcpdm.txt b/Documentation/devicetree/bindings/sound/omap-mcpdm.txt
index 0741dff..6f6c2f8 100644
--- a/Documentation/devicetree/bindings/sound/omap-mcpdm.txt
+++ b/Documentation/devicetree/bindings/sound/omap-mcpdm.txt
@@ -8,6 +8,8 @@
- 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 @@
interrupt-parent = <&gic>;
ti,hwmods = "mcpdm";
};
+
+In board DTS file the pdmclk needs to be added:
+
+&mcpdm {
+ clocks = <&twl6040>;
+ clock-names = "pdmclk";
+ status = "okay";
+};
diff --git a/sound/soc/omap/omap-mcpdm.c b/sound/soc/omap/omap-mcpdm.c
index 74d6e6f..e7cdc51 100644
--- a/sound/soc/omap/omap-mcpdm.c
+++ b/sound/soc/omap/omap-mcpdm.c
@@ -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 @@
unsigned long phys_base;
void __iomem *io_base;
int irq;
+ struct clk *pdmclk;
struct mutex mutex;
@@ -388,6 +390,7 @@
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 @@
pm_runtime_disable(mcpdm->dev);
+ clk_disable_unprepare(mcpdm->pdmclk);
return 0;
}
@@ -441,6 +445,8 @@
mcpdm->pm_active_count++;
}
+ clk_disable_unprepare(mcpdm->pdmclk);
+
return 0;
}
@@ -448,6 +454,8 @@
{
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 @@
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);