drivers: mfd: wcd9xxx: Add support to configure dmic clock

DMIC clock on ECPP(Echo Cancellation Ping-Pong) path can be set to
lower clock rate to avoid power consumption. Change configures the
DMIC clock rate on ECPP path based on device tree settings.

CRs-fixed: 1022917
Change-Id: I03e1a7f5ef3cf1b1907c03a3d38965ce3a611bc4
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>

diff --git a/Documentation/devicetree/bindings/sound/wcd_codec.txt b/Documentation/devicetree/bindings/sound/wcd_codec.txt
index d585595..e37e7c2 100644 (file)
--- a/Documentation/devicetree/bindings/sound/wcd_codec.txt
+++ b/Documentation/devicetree/bindings/sound/wcd_codec.txt
@@ -92,6 +92,14 @@ Optional properties:
                           involving DMIC will use the rate defined by
                           cdc-dmic-sample-rate.
 
+ - qcom,cdc-ecpp-dmic-rate: Specifies the sample rate of digital mic in HZ to be
+                           used by ECPP (Echo Cancellation Ping Pong) block
+                           on the codec. The valid set of values are same
+                           as that of cdc-dmic-sample-rate, but this rate will
+                           only be used by ECPP and all other audio use cases
+                           involving DMIC will use the rate defined by
+                           cdc-dmic-sample-rate.
+
  - qcom,cdc-dmic-clk-drv-strength: Specifies the drive strength for digital microphone
                                   clock in the codec. Accepted values are 2,4,8 and 16.
                                   The clock drive strentgh is in uA. Codec driver will

diff --git a/drivers/mfd/wcd9xxx-utils.c b/drivers/mfd/wcd9xxx-utils.c
index 22d61d9..3828683 100644 (file)
--- a/drivers/mfd/wcd9xxx-utils.c
+++ b/drivers/mfd/wcd9xxx-utils.c
@@ -298,6 +298,7 @@ struct wcd9xxx_pdata *wcd9xxx_populate_dt_data(struct device *dev)
        struct wcd9xxx_pdata *pdata;
        u32 dmic_sample_rate = WCD9XXX_DMIC_SAMPLE_RATE_UNDEFINED;
        u32 mad_dmic_sample_rate = WCD9XXX_DMIC_SAMPLE_RATE_UNDEFINED;
+       u32 ecpp_dmic_sample_rate = WCD9XXX_DMIC_SAMPLE_RATE_UNDEFINED;
        u32 dmic_clk_drive = WCD9XXX_DMIC_CLK_DRIVE_UNDEFINED;
        u32 prop_val;
 
@@ -358,6 +359,15 @@ struct wcd9xxx_pdata *wcd9xxx_populate_dt_data(struct device *dev)
                                                        pdata->mclk_rate,
                                                        "mad_dmic_rate");
 
+       if (!(wcd9xxx_read_of_property_u32(dev, "qcom,cdc-ecpp-dmic-rate",
+                                          &prop_val)))
+               ecpp_dmic_sample_rate = prop_val;
+
+       pdata->ecpp_dmic_sample_rate = wcd9xxx_validate_dmic_sample_rate(dev,
+                                                       ecpp_dmic_sample_rate,
+                                                       pdata->mclk_rate,
+                                                       "ecpp_dmic_rate");
+
        if (!(of_property_read_u32(dev->of_node,
                                   "qcom,cdc-dmic-clk-drv-strength",
                                   &prop_val)))

diff --git a/include/linux/mfd/wcd9xxx/pdata.h b/include/linux/mfd/wcd9xxx/pdata.h
index 52277f2..7bf2bff 100755 (executable)
--- a/include/linux/mfd/wcd9xxx/pdata.h
+++ b/include/linux/mfd/wcd9xxx/pdata.h
@@ -189,6 +189,7 @@ struct wcd9xxx_pdata {
        u32 mclk_rate;
        u32 dmic_sample_rate;
        u32 mad_dmic_sample_rate;
+       u32 ecpp_dmic_sample_rate;
        u32 dmic_clk_drv;
        u16 use_pinctrl;
 };