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

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Message-Id: <20251009-ak7377-driver-v1-2-29e4f6e16ed3@fairphone.com>
Date: Thu, 09 Oct 2025 14:23:39 +0200
From: Griffin Kroah-Hartman <griffin.kroah@...rphone.com>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Tianshu Qiu <tian.shu.qiu@...el.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Luca Weiss <luca.weiss@...rphone.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, 
 Griffin Kroah-Hartman <griffin.kroah@...rphone.com>
Subject: [PATCH RFC 2/3] media: i2c: ak7375: Add support for ak7377

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@...rphone.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