[PATCH v6 0/3] Add support for the TLC5925

[Jean-Jacques Hiblot]

This series adds the support for the TLC5925 LED controller.
This LED controller is driven through SPI. There is little internal logic
and it can be thought of as a deserializer + latches.
The TLC5925 itself drives up to 16 LEDs, but multiple TLC5925s can be
chained to drive more.

The first patch describes the dt bindings.
The second patch implements most of the driver and supports only
synchronous brightness setting (brightness_set_blocking).
The last patch implements the non-blocking version (brightness_set).

changes v5->v6:
 * Make the 'ti,shif-register-length' property optional. The default
   value is 16: the length of the shift register of a single TLC5925.
 * fix minor issues in the binding description

 changes v4->v5:
 * add the headers that the code is a direct user of
 * replace dev_err() with dev_err_probe() in ->probe()
 * comestic changes (spaces, alignment and blank lines)

changes v3->v4:
 * add missing MODULE_DEVICE_TABLE(of, ...) 
 * use dev_err_probe() to avoid spamming the log in case of deferred probe
 * use bitmap ops instead of direct memory access + lock
 * sort headers and a few other cosmetic changes.

changes v2->v3:
 * fixed the yaml description of the bindings (now passes dt_binding_check)
 * renamed shit-register-length into ti,shift-register-length and specify
   its type

changes v1->v2:
 * renamed property shift_register_length into shift-register-length
 * add a SPI MODULE_DEVICE_TABLE structure
 * fixed the yaml description of the bindings (now passes dt_binding_check)


Jean-Jacques Hiblot (3):
  dt-bindings: leds: Add bindings for the TLC5925 controller
  leds: Add driver for the TLC5925 LED controller
  leds: tlc5925: Add support for non blocking operations

 .../devicetree/bindings/leds/ti,tlc5925.yaml  | 105 ++++++++++
 drivers/leds/Kconfig                          |   6 +
 drivers/leds/Makefile                         |   1 +
 drivers/leds/leds-tlc5925.c                   | 182 ++++++++++++++++++
 4 files changed, 294 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/ti,tlc5925.yaml
 create mode 100644 drivers/leds/leds-tlc5925.c

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2.25.1