[PATCH RFC 0/3] Add support for Asahi Kasei AK7377 driver

[PATCH RFC 0/3] Add support for Asahi Kasei AK7377 driver

[Griffin Kroah-Hartman]

Add devicetree bindings and driver support for the AK7377 VCM driver.

The driver code is added to the preexistent ak7375 driver, which appears
to have similar function order. 

Some values of this driver were reverse-engineered from the existing
drivers due to the lack of a datasheet for the AK7377, The driver moves
the lens but could not be fully tested due to lack of camera sensor support,
that's why this is marked RFC.

Signed-off-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
---
Griffin Kroah-Hartman (3):
      dt-bindings: media: i2c: ak7375: Document AK7377
      media: i2c: ak7375: Add support for ak7377
      arm64: dts: qcom: qcm6490-fairphone-fp5: Add cam actuator

 .../devicetree/bindings/media/i2c/asahi-kasei,ak7375.yaml  |  1 +
 arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts         |  7 +++++++
 drivers/media/i2c/ak7375.c                                 | 14 ++++++++++++++
 3 files changed, 22 insertions(+)
---
base-commit: e5f0a698b34ed76002dc5cff3804a61c80233a7a
change-id: 20251009-ak7377-driver-86381f29765b

Best regards,
-- 
Griffin Kroah-Hartman <griffin.kroah@fairphone.com>

[PATCH RFC 1/3] dt-bindings: media: i2c: ak7375: Document AK7377

[Griffin Kroah-Hartman]

Document the Asahi Kasei AK7377.

Signed-off-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
---
 Documentation/devicetree/bindings/media/i2c/asahi-kasei,ak7375.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/media/i2c/asahi-kasei,ak7375.yaml b/Documentation/devicetree/bindings/media/i2c/asahi-kasei,ak7375.yaml
index fe312cc6a87310fc77216d945e7b301dd98acc0c..c040757eb80c925d796919316c64ae31fb4df49c 100644
--- a/Documentation/devicetree/bindings/media/i2c/asahi-kasei,ak7375.yaml
+++ b/Documentation/devicetree/bindings/media/i2c/asahi-kasei,ak7375.yaml
@@ -18,6 +18,7 @@ properties:
     enum:
       - asahi-kasei,ak7345
       - asahi-kasei,ak7375
+      - asahi-kasei,ak7377
 
   reg:
     maxItems: 1

-- 
2.43.0

Re: [PATCH RFC 1/3] dt-bindings: media: i2c: ak7375: Document AK7377

[Krzysztof Kozlowski]

On 09/10/2025 21:23, Griffin Kroah-Hartman wrote:
> Document the Asahi Kasei AK7377.
> 
> Signed-off-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof

[PATCH RFC 2/3] media: i2c: ak7375: Add support for ak7377

[Griffin Kroah-Hartman]

Add support for AK7377 VCM, which is a similar chip to the AK7375.
It has no known standby register setting.

Some values were reverse-engineered from the other chip's code,
so the driver may not currently be reaching its full potential.

Signed-off-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
---
 drivers/media/i2c/ak7375.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/media/i2c/ak7375.c b/drivers/media/i2c/ak7375.c
index 9a2432cea3fff9f0ff41796f97236449792dccfc..47f9d14d9a65d43e5a8e5d6966e8f330c99865f8 100644
--- a/drivers/media/i2c/ak7375.c
+++ b/drivers/media/i2c/ak7375.c
@@ -65,6 +65,19 @@ static const struct ak73xx_chipdef ak7375_cdef = {
 	.power_delay_us	= 10000,
 };
 
+static const struct ak73xx_chipdef ak7377_cdef = {
+	.reg_position	= 0x0,
+	.reg_cont	= 0x2,
+	.shift_pos	= 4,	/* 12 bits position values, need to << 4 */
+	.mode_active	= 0x0,
+	.has_standby	= false,
+	.focus_pos_max	= 1024,
+	.focus_steps	= 1,
+	.ctrl_steps	= 32,
+	.ctrl_delay_us	= 1000,
+	.power_delay_us	= 10000,
+};
+
 static const char * const ak7375_supply_names[] = {
 	"vdd",
 	"vio",
@@ -331,6 +344,7 @@ static int __maybe_unused ak7375_vcm_resume(struct device *dev)
 static const struct of_device_id ak7375_of_table[] = {
 	{ .compatible = "asahi-kasei,ak7345", .data = &ak7345_cdef, },
 	{ .compatible = "asahi-kasei,ak7375", .data = &ak7375_cdef, },
+	{ .compatible = "asahi-kasei,ak7377", .data = &ak7377_cdef, },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, ak7375_of_table);

-- 
2.43.0

[PATCH RFC 3/3] arm64: dts: qcom: qcm6490-fairphone-fp5: Add cam actuator

[Griffin Kroah-Hartman]

Add a node for Asahi Kasei AK7377 actuator, used for focus of the main
back camera sensor.

Signed-off-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
---
 arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
index e115b6a52b299ef663ccfb614785f8f89091f39d..49654f0f914fbe18080d2f55bb6877c8ab7baf0e 100644
--- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
+++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
@@ -616,6 +616,13 @@ &cci0 {
 };
 
 &cci0_i2c0 {
+	camera_imx800_ak7377: actuator@c {
+		compatible = "asahi-kasei,ak7377";
+		reg = <0x0c>;
+		vdd-supply = <&vreg_l7p>;
+		vio-supply = <&vreg_l7p>;
+	};
+
 	/* IMX800 @ 1a */
 
 	eeprom@50 {

-- 
2.43.0

Re: [PATCH RFC 3/3] arm64: dts: qcom: qcm6490-fairphone-fp5: Add cam actuator

[Konrad Dybcio]

On 10/9/25 2:23 PM, Griffin Kroah-Hartman wrote:
> Add a node for Asahi Kasei AK7377 actuator, used for focus of the main
> back camera sensor.
> 
> Signed-off-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
> ---
>  arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> index e115b6a52b299ef663ccfb614785f8f89091f39d..49654f0f914fbe18080d2f55bb6877c8ab7baf0e 100644
> --- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> +++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> @@ -616,6 +616,13 @@ &cci0 {
>  };
>  
>  &cci0_i2c0 {
> +	camera_imx800_ak7377: actuator@c {
> +		compatible = "asahi-kasei,ak7377";
> +		reg = <0x0c>;
> +		vdd-supply = <&vreg_l7p>;
> +		vio-supply = <&vreg_l7p>;

The dt-bindings suggest vdd is 2.8 V and vio is 1.8 V (at least
on AK7375, although this isn't stated explicitly..)

L7P on FP5 is 2.7 V (default) - 3.0 V (which you should probably
tighten to the actual operating value), please double-check this

Konrad

Re: [PATCH RFC 3/3] arm64: dts: qcom: qcm6490-fairphone-fp5: Add cam actuator

[Griffin Kroah-Hartman]

Hi Konrad
On 10/22/25 19:29, Konrad Dybcio wrote:
> On 10/9/25 2:23 PM, Griffin Kroah-Hartman wrote:
>> Add a node for Asahi Kasei AK7377 actuator, used for focus of the main
>> back camera sensor.
>>
>> Signed-off-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
>> ---
>>   arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
>> index e115b6a52b299ef663ccfb614785f8f89091f39d..49654f0f914fbe18080d2f55bb6877c8ab7baf0e 100644
>> --- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
>> +++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
>> @@ -616,6 +616,13 @@ &cci0 {
>>   };
>>   
>>   &cci0_i2c0 {
>> +	camera_imx800_ak7377: actuator@c {
>> +		compatible = "asahi-kasei,ak7377";
>> +		reg = <0x0c>;
>> +		vdd-supply = <&vreg_l7p>;
>> +		vio-supply = <&vreg_l7p>;
> 
> The dt-bindings suggest vdd is 2.8 V and vio is 1.8 V (at least
> on AK7375, although this isn't stated explicitly..)

This AK7377 is integrated into a JHS-M15342-A2, which only takes in VDD 
as a power supply. VIO was only added to satisfy the dt-bindings, as we 
are not sure what the exact pin layout the AK7377 has.

> L7P on FP5 is 2.7 V (default) - 3.0 V (which you should probably
> tighten to the actual operating value), please double-check this

I can confirm that L7P is supposed to be 2.8V on the FP5, I will update 
the dts in my next patchset.

> Konrad

Griffin

Re: [PATCH RFC 3/3] arm64: dts: qcom: qcm6490-fairphone-fp5: Add cam actuator

[Sakari Ailus]

Hi Griffin,

On Thu, Oct 23, 2025 at 10:37:50AM +0200, Griffin Kroah-Hartman wrote:
> Hi Konrad
> On 10/22/25 19:29, Konrad Dybcio wrote:
> > On 10/9/25 2:23 PM, Griffin Kroah-Hartman wrote:
> > > Add a node for Asahi Kasei AK7377 actuator, used for focus of the main
> > > back camera sensor.
> > > 
> > > Signed-off-by: Griffin Kroah-Hartman <griffin.kroah@fairphone.com>
> > > ---
> > >   arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 7 +++++++
> > >   1 file changed, 7 insertions(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> > > index e115b6a52b299ef663ccfb614785f8f89091f39d..49654f0f914fbe18080d2f55bb6877c8ab7baf0e 100644
> > > --- a/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> > > +++ b/arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts
> > > @@ -616,6 +616,13 @@ &cci0 {
> > >   };
> > >   &cci0_i2c0 {
> > > +	camera_imx800_ak7377: actuator@c {
> > > +		compatible = "asahi-kasei,ak7377";
> > > +		reg = <0x0c>;
> > > +		vdd-supply = <&vreg_l7p>;
> > > +		vio-supply = <&vreg_l7p>;
> > 
> > The dt-bindings suggest vdd is 2.8 V and vio is 1.8 V (at least
> > on AK7375, although this isn't stated explicitly..)
> 
> This AK7377 is integrated into a JHS-M15342-A2, which only takes in VDD as a
> power supply. VIO was only added to satisfy the dt-bindings, as we are not
> sure what the exact pin layout the AK7377 has.
> 
> > L7P on FP5 is 2.7 V (default) - 3.0 V (which you should probably
> > tighten to the actual operating value), please double-check this
> 
> I can confirm that L7P is supposed to be 2.8V on the FP5, I will update the
> dts in my next patchset.

This seems to be unrelated to the DTB/driver patches, which I presume I
could take from this version while you'd post an updated DTS only?

-- 
Regards,

Sakari Ailus