[PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Dmitry Osipenko]

Hello,

This small series adds audio route for built-in microphone on NVIDIA Tegra
boards that use WM8903 CODEC. In particular this is needed in order to unmute
internal microphone on Acer A500 tablet device. I'm planning to send out the
device tree for the A500 for 5.8, so will be nice to get the microphone
sorted out. Please review and apply, thanks in advance.

Dmitry Osipenko (2):
  dt-bindings: sound: tegra-wm8903: Document built-in microphone audio
    source
  ASoC: tegra: tegra_wm8903: Support DAPM events for built-in microphone

 .../sound/nvidia,tegra-audio-wm8903.txt        |  1 +
 sound/soc/tegra/tegra_wm8903.c                 | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

-- 
2.25.1

[PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Dmitry Osipenko]

Hello,

This small series adds audio route for built-in microphone on NVIDIA Tegra
boards that use WM8903 CODEC. In particular this is needed in order to unmute
internal microphone on Acer A500 tablet device. I'm planning to send out the
device tree for the A500 for 5.8, so will be nice to get the microphone
sorted out. Please review and apply, thanks in advance.

Dmitry Osipenko (2):
  dt-bindings: sound: tegra-wm8903: Document built-in microphone audio
    source
  ASoC: tegra: tegra_wm8903: Support DAPM events for built-in microphone

 .../sound/nvidia,tegra-audio-wm8903.txt        |  1 +
 sound/soc/tegra/tegra_wm8903.c                 | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

-- 
2.25.1

[PATCH v1 1/2] dt-bindings: sound: tegra-wm8903: Document built-in microphone audio source

[Dmitry Osipenko]

The internal microphone source is needed in order to be able to describe
the hardware audio routing for devices that have the built-in microphone
in addition to the external Mic Jack.

Signed-off-by: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 .../devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt      | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt b/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt
index b795d282818d..a8f2b0c56c79 100644
--- a/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt
+++ b/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt
@@ -18,6 +18,7 @@ Required properties:
   * Headphone Jack
   * Int Spk
   * Mic Jack
+  * Int Mic
 
 - nvidia,i2s-controller : The phandle of the Tegra I2S1 controller
 - nvidia,audio-codec : The phandle of the WM8903 audio codec
-- 
2.25.1

[PATCH v1 1/2] dt-bindings: sound: tegra-wm8903: Document built-in microphone audio source

[Dmitry Osipenko]

The internal microphone source is needed in order to be able to describe
the hardware audio routing for devices that have the built-in microphone
in addition to the external Mic Jack.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 .../devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt      | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt b/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt
index b795d282818d..a8f2b0c56c79 100644
--- a/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt
+++ b/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt
@@ -18,6 +18,7 @@ Required properties:
   * Headphone Jack
   * Int Spk
   * Mic Jack
+  * Int Mic
 
 - nvidia,i2s-controller : The phandle of the Tegra I2S1 controller
 - nvidia,audio-codec : The phandle of the WM8903 audio codec
-- 
2.25.1

[PATCH v1 1/2] dt-bindings: sound: tegra-wm8903: Document built-in microphone audio source

[Dmitry Osipenko]

The internal microphone source is needed in order to be able to describe
the hardware audio routing for devices that have the built-in microphone
in addition to the external Mic Jack.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 .../devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt      | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt b/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt
index b795d282818d..a8f2b0c56c79 100644
--- a/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt
+++ b/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm8903.txt
@@ -18,6 +18,7 @@ Required properties:
   * Headphone Jack
   * Int Spk
   * Mic Jack
+  * Int Mic
 
 - nvidia,i2s-controller : The phandle of the Tegra I2S1 controller
 - nvidia,audio-codec : The phandle of the WM8903 audio codec
-- 
2.25.1

[PATCH v1 2/2] ASoC: tegra: tegra_wm8903: Support DAPM events for built-in microphone

[Dmitry Osipenko]

The enable-GPIO needs to be toggled on a DAPM event in order to turn
microphone ON/OFF, otherwise microphone won't work.

Signed-off-by: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 sound/soc/tegra/tegra_wm8903.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/sound/soc/tegra/tegra_wm8903.c b/sound/soc/tegra/tegra_wm8903.c
index f08d3489c3cf..071c7d2de77c 100644
--- a/sound/soc/tegra/tegra_wm8903.c
+++ b/sound/soc/tegra/tegra_wm8903.c
@@ -143,14 +143,32 @@ static int tegra_wm8903_event_hp(struct snd_soc_dapm_widget *w,
 	return 0;
 }
 
+static int tegra_wm8903_event_int_mic(struct snd_soc_dapm_widget *w,
+				      struct snd_kcontrol *k, int event)
+{
+	struct snd_soc_dapm_context *dapm = w->dapm;
+	struct snd_soc_card *card = dapm->card;
+	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
+
+	if (!gpio_is_valid(machine->gpio_int_mic_en))
+		return 0;
+
+	gpio_set_value_cansleep(machine->gpio_int_mic_en,
+				SND_SOC_DAPM_EVENT_ON(event));
+
+	return 0;
+}
+
 static const struct snd_soc_dapm_widget tegra_wm8903_dapm_widgets[] = {
 	SND_SOC_DAPM_SPK("Int Spk", tegra_wm8903_event_int_spk),
 	SND_SOC_DAPM_HP("Headphone Jack", tegra_wm8903_event_hp),
 	SND_SOC_DAPM_MIC("Mic Jack", NULL),
+	SND_SOC_DAPM_MIC("Int Mic", tegra_wm8903_event_int_mic),
 };
 
 static const struct snd_kcontrol_new tegra_wm8903_controls[] = {
 	SOC_DAPM_PIN_SWITCH("Int Spk"),
+	SOC_DAPM_PIN_SWITCH("Int Mic"),
 };
 
 static int tegra_wm8903_init(struct snd_soc_pcm_runtime *rtd)
-- 
2.25.1

[PATCH v1 2/2] ASoC: tegra: tegra_wm8903: Support DAPM events for built-in microphone

[Dmitry Osipenko]

The enable-GPIO needs to be toggled on a DAPM event in order to turn
microphone ON/OFF, otherwise microphone won't work.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 sound/soc/tegra/tegra_wm8903.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/sound/soc/tegra/tegra_wm8903.c b/sound/soc/tegra/tegra_wm8903.c
index f08d3489c3cf..071c7d2de77c 100644
--- a/sound/soc/tegra/tegra_wm8903.c
+++ b/sound/soc/tegra/tegra_wm8903.c
@@ -143,14 +143,32 @@ static int tegra_wm8903_event_hp(struct snd_soc_dapm_widget *w,
 	return 0;
 }
 
+static int tegra_wm8903_event_int_mic(struct snd_soc_dapm_widget *w,
+				      struct snd_kcontrol *k, int event)
+{
+	struct snd_soc_dapm_context *dapm = w->dapm;
+	struct snd_soc_card *card = dapm->card;
+	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
+
+	if (!gpio_is_valid(machine->gpio_int_mic_en))
+		return 0;
+
+	gpio_set_value_cansleep(machine->gpio_int_mic_en,
+				SND_SOC_DAPM_EVENT_ON(event));
+
+	return 0;
+}
+
 static const struct snd_soc_dapm_widget tegra_wm8903_dapm_widgets[] = {
 	SND_SOC_DAPM_SPK("Int Spk", tegra_wm8903_event_int_spk),
 	SND_SOC_DAPM_HP("Headphone Jack", tegra_wm8903_event_hp),
 	SND_SOC_DAPM_MIC("Mic Jack", NULL),
+	SND_SOC_DAPM_MIC("Int Mic", tegra_wm8903_event_int_mic),
 };
 
 static const struct snd_kcontrol_new tegra_wm8903_controls[] = {
 	SOC_DAPM_PIN_SWITCH("Int Spk"),
+	SOC_DAPM_PIN_SWITCH("Int Mic"),
 };
 
 static int tegra_wm8903_init(struct snd_soc_pcm_runtime *rtd)
-- 
2.25.1

[PATCH v1 2/2] ASoC: tegra: tegra_wm8903: Support DAPM events for built-in microphone

[Dmitry Osipenko]

The enable-GPIO needs to be toggled on a DAPM event in order to turn
microphone ON/OFF, otherwise microphone won't work.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 sound/soc/tegra/tegra_wm8903.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/sound/soc/tegra/tegra_wm8903.c b/sound/soc/tegra/tegra_wm8903.c
index f08d3489c3cf..071c7d2de77c 100644
--- a/sound/soc/tegra/tegra_wm8903.c
+++ b/sound/soc/tegra/tegra_wm8903.c
@@ -143,14 +143,32 @@ static int tegra_wm8903_event_hp(struct snd_soc_dapm_widget *w,
 	return 0;
 }
 
+static int tegra_wm8903_event_int_mic(struct snd_soc_dapm_widget *w,
+				      struct snd_kcontrol *k, int event)
+{
+	struct snd_soc_dapm_context *dapm = w->dapm;
+	struct snd_soc_card *card = dapm->card;
+	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
+
+	if (!gpio_is_valid(machine->gpio_int_mic_en))
+		return 0;
+
+	gpio_set_value_cansleep(machine->gpio_int_mic_en,
+				SND_SOC_DAPM_EVENT_ON(event));
+
+	return 0;
+}
+
 static const struct snd_soc_dapm_widget tegra_wm8903_dapm_widgets[] = {
 	SND_SOC_DAPM_SPK("Int Spk", tegra_wm8903_event_int_spk),
 	SND_SOC_DAPM_HP("Headphone Jack", tegra_wm8903_event_hp),
 	SND_SOC_DAPM_MIC("Mic Jack", NULL),
+	SND_SOC_DAPM_MIC("Int Mic", tegra_wm8903_event_int_mic),
 };
 
 static const struct snd_kcontrol_new tegra_wm8903_controls[] = {
 	SOC_DAPM_PIN_SWITCH("Int Spk"),
+	SOC_DAPM_PIN_SWITCH("Int Mic"),
 };
 
 static int tegra_wm8903_init(struct snd_soc_pcm_runtime *rtd)
-- 
2.25.1

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Stephen Warren]

On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
> Hello,
> 
> This small series adds audio route for built-in microphone on NVIDIA Tegra
> boards that use WM8903 CODEC. In particular this is needed in order to unmute
> internal microphone on Acer A500 tablet device. I'm planning to send out the
> device tree for the A500 for 5.8, so will be nice to get the microphone
> sorted out. Please review and apply, thanks in advance.

It's been a long time since I looked at this code, but the series looks
plausible,
Acked-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

(I wonder why machine->gpio_int_mic_en was already parse but never used!)

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Stephen Warren]

On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
> Hello,
> 
> This small series adds audio route for built-in microphone on NVIDIA Tegra
> boards that use WM8903 CODEC. In particular this is needed in order to unmute
> internal microphone on Acer A500 tablet device. I'm planning to send out the
> device tree for the A500 for 5.8, so will be nice to get the microphone
> sorted out. Please review and apply, thanks in advance.

It's been a long time since I looked at this code, but the series looks
plausible,
Acked-by: Stephen Warren <swarren@nvidia.com>

(I wonder why machine->gpio_int_mic_en was already parse but never used!)

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Stephen Warren]

On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
> Hello,
> 
> This small series adds audio route for built-in microphone on NVIDIA Tegra
> boards that use WM8903 CODEC. In particular this is needed in order to unmute
> internal microphone on Acer A500 tablet device. I'm planning to send out the
> device tree for the A500 for 5.8, so will be nice to get the microphone
> sorted out. Please review and apply, thanks in advance.

It's been a long time since I looked at this code, but the series looks
plausible,
Acked-by: Stephen Warren <swarren@nvidia.com>

(I wonder why machine->gpio_int_mic_en was already parse but never used!)

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Dmitry Osipenko]

21.03.2020 01:30, Stephen Warren пишет:
> On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
>> Hello,
>>
>> This small series adds audio route for built-in microphone on NVIDIA Tegra
>> boards that use WM8903 CODEC. In particular this is needed in order to unmute
>> internal microphone on Acer A500 tablet device. I'm planning to send out the
>> device tree for the A500 for 5.8, so will be nice to get the microphone
>> sorted out. Please review and apply, thanks in advance.
> 
> It's been a long time since I looked at this code, but the series looks
> plausible,
> Acked-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Thank you!

> (I wonder why machine->gpio_int_mic_en was already parse but never used!)

Perhaps there were plans to support it later on, but that never
materialized.

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Dmitry Osipenko]

21.03.2020 01:30, Stephen Warren пишет:
> On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
>> Hello,
>>
>> This small series adds audio route for built-in microphone on NVIDIA Tegra
>> boards that use WM8903 CODEC. In particular this is needed in order to unmute
>> internal microphone on Acer A500 tablet device. I'm planning to send out the
>> device tree for the A500 for 5.8, so will be nice to get the microphone
>> sorted out. Please review and apply, thanks in advance.
> 
> It's been a long time since I looked at this code, but the series looks
> plausible,
> Acked-by: Stephen Warren <swarren@nvidia.com>

Thank you!

> (I wonder why machine->gpio_int_mic_en was already parse but never used!)

Perhaps there were plans to support it later on, but that never
materialized.

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Dmitry Osipenko]

21.03.2020 01:30, Stephen Warren пишет:
> On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
>> Hello,
>>
>> This small series adds audio route for built-in microphone on NVIDIA Tegra
>> boards that use WM8903 CODEC. In particular this is needed in order to unmute
>> internal microphone on Acer A500 tablet device. I'm planning to send out the
>> device tree for the A500 for 5.8, so will be nice to get the microphone
>> sorted out. Please review and apply, thanks in advance.
> 
> It's been a long time since I looked at this code, but the series looks
> plausible,
> Acked-by: Stephen Warren <swarren@nvidia.com>

Thank you!

> (I wonder why machine->gpio_int_mic_en was already parse but never used!)

Perhaps there were plans to support it later on, but that never
materialized.

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Jon Hunter]

On 20/03/2020 22:30, Stephen Warren wrote:
> On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
>> Hello,
>>
>> This small series adds audio route for built-in microphone on NVIDIA Tegra
>> boards that use WM8903 CODEC. In particular this is needed in order to unmute
>> internal microphone on Acer A500 tablet device. I'm planning to send out the
>> device tree for the A500 for 5.8, so will be nice to get the microphone
>> sorted out. Please review and apply, thanks in advance.
> 
> It's been a long time since I looked at this code, but the series looks
> plausible,
> Acked-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> 
> (I wonder why machine->gpio_int_mic_en was already parse but never used!)

Looking at the ventana schematics, it appears that the internal-mic
signals was connected to a header and not an actual mic, so maybe we
never had a proper internal-mic on any board but allowed one to be
connected.

Anyway, looks good to me as well.

Acked-by: Jon Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Cheers
Jon

-- 
nvpublic

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Jon Hunter]

On 20/03/2020 22:30, Stephen Warren wrote:
> On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
>> Hello,
>>
>> This small series adds audio route for built-in microphone on NVIDIA Tegra
>> boards that use WM8903 CODEC. In particular this is needed in order to unmute
>> internal microphone on Acer A500 tablet device. I'm planning to send out the
>> device tree for the A500 for 5.8, so will be nice to get the microphone
>> sorted out. Please review and apply, thanks in advance.
> 
> It's been a long time since I looked at this code, but the series looks
> plausible,
> Acked-by: Stephen Warren <swarren@nvidia.com>
> 
> (I wonder why machine->gpio_int_mic_en was already parse but never used!)

Looking at the ventana schematics, it appears that the internal-mic
signals was connected to a header and not an actual mic, so maybe we
never had a proper internal-mic on any board but allowed one to be
connected.

Anyway, looks good to me as well.

Acked-by: Jon Hunter <jonathanh@nvidia.com>

Cheers
Jon

-- 
nvpublic

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Jon Hunter]

On 20/03/2020 22:30, Stephen Warren wrote:
> On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
>> Hello,
>>
>> This small series adds audio route for built-in microphone on NVIDIA Tegra
>> boards that use WM8903 CODEC. In particular this is needed in order to unmute
>> internal microphone on Acer A500 tablet device. I'm planning to send out the
>> device tree for the A500 for 5.8, so will be nice to get the microphone
>> sorted out. Please review and apply, thanks in advance.
> 
> It's been a long time since I looked at this code, but the series looks
> plausible,
> Acked-by: Stephen Warren <swarren@nvidia.com>
> 
> (I wonder why machine->gpio_int_mic_en was already parse but never used!)

Looking at the ventana schematics, it appears that the internal-mic
signals was connected to a header and not an actual mic, so maybe we
never had a proper internal-mic on any board but allowed one to be
connected.

Anyway, looks good to me as well.

Acked-by: Jon Hunter <jonathanh@nvidia.com>

Cheers
Jon

-- 
nvpublic

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Dmitry Osipenko]

23.03.2020 18:59, Jon Hunter пишет:
> 
> 
> On 20/03/2020 22:30, Stephen Warren wrote:
>> On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
>>> Hello,
>>>
>>> This small series adds audio route for built-in microphone on NVIDIA Tegra
>>> boards that use WM8903 CODEC. In particular this is needed in order to unmute
>>> internal microphone on Acer A500 tablet device. I'm planning to send out the
>>> device tree for the A500 for 5.8, so will be nice to get the microphone
>>> sorted out. Please review and apply, thanks in advance.
>>
>> It's been a long time since I looked at this code, but the series looks
>> plausible,
>> Acked-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>>
>> (I wonder why machine->gpio_int_mic_en was already parse but never used!)
> 
> Looking at the ventana schematics, it appears that the internal-mic
> signals was connected to a header and not an actual mic, so maybe we
> never had a proper internal-mic on any board but allowed one to be
> connected.

I guess cardhu may have a mic, judging by downstream kernel sources (I
don't have cardhu schematics).

> Anyway, looks good to me as well.
> 
> Acked-by: Jon Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

Thanks

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Dmitry Osipenko]

23.03.2020 18:59, Jon Hunter пишет:
> 
> 
> On 20/03/2020 22:30, Stephen Warren wrote:
>> On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
>>> Hello,
>>>
>>> This small series adds audio route for built-in microphone on NVIDIA Tegra
>>> boards that use WM8903 CODEC. In particular this is needed in order to unmute
>>> internal microphone on Acer A500 tablet device. I'm planning to send out the
>>> device tree for the A500 for 5.8, so will be nice to get the microphone
>>> sorted out. Please review and apply, thanks in advance.
>>
>> It's been a long time since I looked at this code, but the series looks
>> plausible,
>> Acked-by: Stephen Warren <swarren@nvidia.com>
>>
>> (I wonder why machine->gpio_int_mic_en was already parse but never used!)
> 
> Looking at the ventana schematics, it appears that the internal-mic
> signals was connected to a header and not an actual mic, so maybe we
> never had a proper internal-mic on any board but allowed one to be
> connected.

I guess cardhu may have a mic, judging by downstream kernel sources (I
don't have cardhu schematics).

> Anyway, looks good to me as well.
> 
> Acked-by: Jon Hunter <jonathanh@nvidia.com>

Thanks

Re: [PATCH v1 0/2] Support built-in Mic on Tegra boards that use WM8903

[Dmitry Osipenko]

23.03.2020 18:59, Jon Hunter пишет:
> 
> 
> On 20/03/2020 22:30, Stephen Warren wrote:
>> On 3/20/20 2:55 PM, Dmitry Osipenko wrote:
>>> Hello,
>>>
>>> This small series adds audio route for built-in microphone on NVIDIA Tegra
>>> boards that use WM8903 CODEC. In particular this is needed in order to unmute
>>> internal microphone on Acer A500 tablet device. I'm planning to send out the
>>> device tree for the A500 for 5.8, so will be nice to get the microphone
>>> sorted out. Please review and apply, thanks in advance.
>>
>> It's been a long time since I looked at this code, but the series looks
>> plausible,
>> Acked-by: Stephen Warren <swarren@nvidia.com>
>>
>> (I wonder why machine->gpio_int_mic_en was already parse but never used!)
> 
> Looking at the ventana schematics, it appears that the internal-mic
> signals was connected to a header and not an actual mic, so maybe we
> never had a proper internal-mic on any board but allowed one to be
> connected.

I guess cardhu may have a mic, judging by downstream kernel sources (I
don't have cardhu schematics).

> Anyway, looks good to me as well.
> 
> Acked-by: Jon Hunter <jonathanh@nvidia.com>

Thanks