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[V7,0/2] media: i2c: Add support for DW9768 VCM driver

Message ID 20200605105412.18813-1-dongchun.zhu@mediatek.com (mailing list archive)
Headers show
Series media: i2c: Add support for DW9768 VCM driver | expand

Message

Dongchun Zhu June 5, 2020, 10:54 a.m. UTC 
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 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:
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 v7 are addressing comments from Rob, Sakari, Tomasz.
Compared to v6:
 - Refine DT bindings
 - Use i2c_smbus_read_byte_data() directly to replace of dw9768_read_smbus()
 - Calculate operation time based on the configured board-specific DT settings
 - Abstract async register error handling case
 - Fix other review comments in v6

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                          |  13 +
 drivers/media/i2c/Makefile                         |   1 +
 drivers/media/i2c/dw9768.c                         | 566 +++++++++++++++++++++
 5 files changed, 688 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/dongwoon,dw9768.yaml
 create mode 100644 drivers/media/i2c/dw9768.c