[PATCH v2 0/2] Add DMIC slew rate select

[PATCH v2 0/2] Add DMIC slew rate select

[Seven Lee]

Determine DMIC slew rate via property setup. 

Change:
V1 -> V2:
  - Corrected description of DMIC slew rate. 

Seven Lee (2):
  ASoC: dt-bindings: nau8821: Add DMIC slew rate selection
  ASoC: nau8821: Add slew rate controls.

 .../devicetree/bindings/sound/nuvoton,nau8821.yaml        | 8 ++++++++
 sound/soc/codecs/nau8821.c                                | 7 +++++++
 sound/soc/codecs/nau8821.h                                | 3 +++
 3 files changed, 18 insertions(+)

-- 
2.25.1

[PATCH v2 1/2] ASoC: dt-bindings: nau8821: Add DMIC slew rate selection

[Seven Lee]

Add input with DMIC slew rate selection

Signed-off-by: Seven Lee <wtli@nuvoton.com>
---
 .../devicetree/bindings/sound/nuvoton,nau8821.yaml        | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml b/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
index 3e54abd4ca74..01028b7ff85c 100644
--- a/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
+++ b/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
@@ -89,6 +89,13 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     default: 3072000
 
+  nuvoton,dmic-slew-rate-selection:
+    description: the number from 0 to 7 that sets the DMIC slew rate.
+        The unit is mV/ns. 0 is the slowest, and 7 is the fastest.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 7
+    default: 0
+
   nuvoton,left-input-single-end:
     description: Enable left input with single-ended settings if set.
         For the headset mic application, the single-ended control is
@@ -127,6 +134,7 @@ examples:
             nuvoton,jack-insert-debounce = <7>;
             nuvoton,jack-eject-debounce = <0>;
             nuvoton,dmic-clk-threshold = <3072000>;
+            nuvoton,dmic-slew-rate-selection= <0>;
             #sound-dai-cells = <0>;
         };
     };
-- 
2.25.1

[PATCH v2 2/2] ASoC: nau8821: Add slew rate controls.

[Seven Lee]

The patch supports DMIC clock slew rate selection.

Signed-off-by: Seven Lee <wtli@nuvoton.com>
---
 sound/soc/codecs/nau8821.c | 7 +++++++
 sound/soc/codecs/nau8821.h | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/sound/soc/codecs/nau8821.c b/sound/soc/codecs/nau8821.c
index 6e1b6b26298a..d8190e8a431f 100644
--- a/sound/soc/codecs/nau8821.c
+++ b/sound/soc/codecs/nau8821.c
@@ -1738,6 +1738,10 @@ static int nau8821_read_device_properties(struct device *dev,
 		&nau8821->dmic_clk_threshold);
 	if (ret)
 		nau8821->dmic_clk_threshold = 3072000;
+	ret = device_property_read_u32(dev, "nuvoton,dmic-slew-rate-selection",
+		&nau8821->dmic_slew_rate_sel);
+	if (ret)
+		nau8821->dmic_slew_rate_sel = 0;
 
 	return 0;
 }
@@ -1797,6 +1801,9 @@ static void nau8821_init_regs(struct nau8821 *nau8821)
 		NAU8821_ADC_SYNC_DOWN_MASK, NAU8821_ADC_SYNC_DOWN_64);
 	regmap_update_bits(regmap, NAU8821_R2C_DAC_CTRL1,
 		NAU8821_DAC_OVERSAMPLE_MASK, NAU8821_DAC_OVERSAMPLE_64);
+	regmap_update_bits(regmap, NAU8821_R13_DMIC_CTRL,
+		NAU8821_DMIC_SLEW_MASK, nau8821->dmic_slew_rate_sel <<
+		NAU8821_DMIC_SLEW_SFT);
 	if (nau8821->left_input_single_end) {
 		regmap_update_bits(regmap, NAU8821_R6B_PGA_MUTE,
 			NAU8821_MUTE_MICNL_EN, NAU8821_MUTE_MICNL_EN);
diff --git a/sound/soc/codecs/nau8821.h b/sound/soc/codecs/nau8821.h
index 00a888ed07ce..480f605d5d50 100644
--- a/sound/soc/codecs/nau8821.h
+++ b/sound/soc/codecs/nau8821.h
@@ -236,6 +236,8 @@
 #define NAU8821_DMIC_SRC_MASK	(0x3 << NAU8821_DMIC_SRC_SFT)
 #define NAU8821_CLK_DMIC_SRC	(0x2 << NAU8821_DMIC_SRC_SFT)
 #define NAU8821_DMIC_EN_SFT	0
+#define NAU8821_DMIC_SLEW_SFT  8
+#define NAU8821_DMIC_SLEW_MASK (0x7 << NAU8821_DMIC_SLEW_SFT)
 
 /* GPIO12_CTRL (0x1a) */
 #define NAU8821_JKDET_PULL_UP	(0x1 << 11) /* 0 - pull down, 1 - pull up */
@@ -573,6 +575,7 @@ struct nau8821 {
 	int jack_eject_debounce;
 	int fs;
 	int dmic_clk_threshold;
+	int dmic_slew_rate_sel;
 	int key_enable;
 };
 
-- 
2.25.1

Re: [PATCH v2 1/2] ASoC: dt-bindings: nau8821: Add DMIC slew rate selection

[Conor Dooley]

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Hey,

On Fri, Oct 27, 2023 at 04:21:43PM +0800, Seven Lee wrote:
> Add input with DMIC slew rate selection
> 
> Signed-off-by: Seven Lee <wtli@nuvoton.com>
> ---
>  .../devicetree/bindings/sound/nuvoton,nau8821.yaml        | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml b/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
> index 3e54abd4ca74..01028b7ff85c 100644
> --- a/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
> +++ b/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
> @@ -89,6 +89,13 @@ properties:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      default: 3072000
>  
> +  nuvoton,dmic-slew-rate-selection:
> +    description: the number from 0 to 7 that sets the DMIC slew rate.
> +        The unit is mV/ns. 0 is the slowest, and 7 is the fastest.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    maximum: 7
> +    default: 0

I meant make the property in terms of the unit, so
nuvoton,dmic-slew-rate-volt-per-sec (or similar, Rob would likely know
better how he likes the unit suffix for a more complex unit like this
one) and then make it an enum with possible values corresponding to
the real values that putting 0, 1, 2, 3 etc into the register produces.

Cheers,
Conor.

> +
>    nuvoton,left-input-single-end:
>      description: Enable left input with single-ended settings if set.
>          For the headset mic application, the single-ended control is
> @@ -127,6 +134,7 @@ examples:
>              nuvoton,jack-insert-debounce = <7>;
>              nuvoton,jack-eject-debounce = <0>;
>              nuvoton,dmic-clk-threshold = <3072000>;
> +            nuvoton,dmic-slew-rate-selection= <0>;
>              #sound-dai-cells = <0>;
>          };
>      };
> -- 
> 2.25.1
> 

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Re: [PATCH v2 1/2] ASoC: dt-bindings: nau8821: Add DMIC slew rate selection

[Rob Herring]

On Fri, Oct 27, 2023 at 03:11:35PM +0100, Conor Dooley wrote:
> Hey,
> 
> On Fri, Oct 27, 2023 at 04:21:43PM +0800, Seven Lee wrote:
> > Add input with DMIC slew rate selection
> > 
> > Signed-off-by: Seven Lee <wtli@nuvoton.com>
> > ---
> >  .../devicetree/bindings/sound/nuvoton,nau8821.yaml        | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml b/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
> > index 3e54abd4ca74..01028b7ff85c 100644
> > --- a/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
> > +++ b/Documentation/devicetree/bindings/sound/nuvoton,nau8821.yaml
> > @@ -89,6 +89,13 @@ properties:
> >      $ref: /schemas/types.yaml#/definitions/uint32
> >      default: 3072000
> >  
> > +  nuvoton,dmic-slew-rate-selection:
> > +    description: the number from 0 to 7 that sets the DMIC slew rate.
> > +        The unit is mV/ns. 0 is the slowest, and 7 is the fastest.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    maximum: 7
> > +    default: 0
> 
> I meant make the property in terms of the unit, so
> nuvoton,dmic-slew-rate-volt-per-sec (or similar, Rob would likely know
> better how he likes the unit suffix for a more complex unit like this
> one) and then make it an enum with possible values corresponding to
> the real values that putting 0, 1, 2, 3 etc into the register produces.

From what I've seen, you often don't know what units the h/w settings 
correspond to. Often it's just fast, medium, slow or something. And 
here, 0 doesn't make sense if the units really are mV/ns. 

So I'd just drop '-selection' and be done with it. (And clear up the 
units part).

> 
> Cheers,
> Conor.
> 
> > +
> >    nuvoton,left-input-single-end:
> >      description: Enable left input with single-ended settings if set.
> >          For the headset mic application, the single-ended control is
> > @@ -127,6 +134,7 @@ examples:
> >              nuvoton,jack-insert-debounce = <7>;
> >              nuvoton,jack-eject-debounce = <0>;
> >              nuvoton,dmic-clk-threshold = <3072000>;
> > +            nuvoton,dmic-slew-rate-selection= <0>;
> >              #sound-dai-cells = <0>;
> >          };
> >      };
> > -- 
> > 2.25.1
> >