[PATCH V9 0/2] media: i2c: Add support for DW9768 VCM

From: Dongchun Zhu <dongchun.zhu@mediatek.com>
To: <linus.walleij@linaro.org>, <bgolaszewski@baylibre.com>,
	<mchehab@kernel.org>, <andriy.shevchenko@linux.intel.com>,
	<robh+dt@kernel.org>, <mark.rutland@arm.com>,
	<sakari.ailus@linux.intel.com>, <drinkcat@chromium.org>,
	<tfiga@chromium.org>, <matthias.bgg@gmail.com>,
	<bingbu.cao@intel.com>
Cc: <srv_heupstream@mediatek.com>,
	<linux-mediatek@lists.infradead.org>,
	<linux-arm-kernel@lists.infradead.org>, <sj.huang@mediatek.com>,
	<linux-media@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<louis.kuo@mediatek.com>, <shengnan.wang@mediatek.com>,
	<dongchun.zhu@mediatek.com>
Subject: [PATCH V9 0/2] media: i2c: Add support for DW9768 VCM
Date: Tue, 30 Jun 2020 14:22:09 +0800	[thread overview]
Message-ID: <20200630062211.22988-1-dongchun.zhu@mediatek.com> (raw)

Hello,

This series adds DT bindings and V4L2 sub-device driver for Dongwoon's DW9768,
which is a 10-bit DAC with 100mA output current sink capability.

The driver is designed for linear control of voice coil motor(VCM).
It creates a V4L2 sub-device and provides control to set the desired focus.

It controls the position with 10-bit DAC data D[9:0] and seperates
two 8-bit registers to control the VCM position as belows.
DAC_MSB: D[9:8](ADDR: 0x03):
     +---+---+---+---+---+---+---+---+
     |---|---|---|---|---|---|D09|D08|
     +---+---+---+---+---+---+---+---+
DAC_LSB: D[7:0](ADDR: 0x04):
     +---+---+---+---+---+---+---+---+
     |D07|D06|D05|D04|D03|D02|D01|D00|
     +---+---+---+---+---+---+---+---+

This driver supports:
 - set DW9768 to standby mode once suspend and turn it back to active if resume
 - set the desired focus via V4L2_CID_FOCUS_ABSOLUTE ctrl

Previous versions of this patch-set can be found here:
 v8: https://lore.kernel.org/linux-media/20200616125531.31671-1-dongchun.zhu@mediatek.com/
 v7: https://lore.kernel.org/linux-media/20200605105412.18813-1-dongchun.zhu@mediatek.com/
 v6: https://lore.kernel.org/linux-media/20200518132731.20855-1-dongchun.zhu@mediatek.com/
 v5: https://lore.kernel.org/linux-media/20200502161727.30463-1-dongchun.zhu@mediatek.com/
 v4: https://lore.kernel.org/linux-media/20200330123634.363-1-dongchun.zhu@mediatek.com/
 v3: https://lore.kernel.org/linux-media/20200228155958.20657-1-dongchun.zhu@mediatek.com/
 v2: https://lore.kernel.org/linux-media/20190905072142.14606-1-dongchun.zhu@mediatek.com/
 v1: https://lore.kernel.org/linux-media/20190708100641.2702-1-dongchun.zhu@mediatek.com/

Mainly changes of v9 are addressing comments from Tomasz.
Compared to v8:
 - Refine dw9768_cal_move_delay() to return the value in a standard unit
 - Refine err_power_off error handler section in probe()
 - Use pm_runtime_status_suspended() in remove()

Please review.
Thanks.

Dongchun Zhu (2):
  media: dt-bindings: media: i2c: Document DW9768 bindings
  media: i2c: dw9768: Add DW9768 VCM driver

 .../bindings/media/i2c/dongwoon,dw9768.yaml        | 100 ++++
 MAINTAINERS                                        |   8 +
 drivers/media/i2c/Kconfig                          |  12 +
 drivers/media/i2c/Makefile                         |   1 +
 drivers/media/i2c/dw9768.c                         | 554 +++++++++++++++++++++
 5 files changed, 675 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/dongwoon,dw9768.yaml
 create mode 100644 drivers/media/i2c/dw9768.c

-- 
2.9.2