linux-kernel - [PATCH v6 0/2] leds: Add a driver for KTD202x

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Date:   Mon, 02 Oct 2023 18:48:26 +0200
From:   André Apitzsch <git@...tzsch.eu>
To:     Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        André Apitzsch <git@...tzsch.eu>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v6 0/2] leds: Add a driver for KTD202x

Add the binding description and the corresponding driver for
the Kinetic KTD2026 and KTD2027.

Signed-off-by: André Apitzsch <git@...tzsch.eu>
---
Changes in v6:
- Remove un-needed inits
- Narrow scope of variables
- Release of_node references on early exit
- Pass child node to dev_err() in ktd202x_setup_led_rgb()
- Link to v5: https://lore.kernel.org/r/20231001-ktd202x-v5-0-f544a1d0510d@apitzsch.eu

Changes in v5:
- Restructure brightness_set() + add comments to it to be easier understandable
- Add some line breaks + remove little line-wraps to improve readability
- Move parts of add_led() to setup_led_{rgb,single}()
- Move mutex_init() to the end of probe to omit gotos
- Fix grammar
- Set initial intensity to max brightness to avoid LED staying off when
  brightness is changed after switching to timer trigger, because of zero
  intensity
- Link to v4: https://lore.kernel.org/r/20230923-ktd202x-v4-0-14f724f6d43b@apitzsch.eu

Changes in v4:
- Annotate struct ktd202x with __counted_by
- Link to v3: https://lore.kernel.org/r/20230906-ktd202x-v3-0-7fcb91c65d3a@apitzsch.eu

Changes in v3:
- Add r-b to bindings patch
- Replace .probe_new by .probe
- Link to v2: https://lore.kernel.org/r/20230901-ktd202x-v2-0-3cb8b0ca02ed@apitzsch.eu

Changes in v2:
- Make binding description filename match compatible
- Address comments by Lee Jones
  - Extend driver description in Kconfig
  - Add copyright + link to datasheet
  - Add unit to definition/variable names, where needed
  - Define magic numbers
  - Remove forward declaration of 'struct ktd202x'
  - Remove superfluous comments
  - Get rid of struct ktd202x_info
  - Join ktd202x_chip_init() with ktd202x_chip_enable()
  - Return the error on ktd202x_chip_disable()
  - Remove unreachable case from chip_in_use()
  - Rename ktd202x_brightness_set() argument from num_colors to num_channels
  - Forward errors received in ktd202x_brightness_set()
  - Remove variable for 'num_channels = 1'
  - Add some explanations to blink time calculation
  - Remove unneeded lcdev from ktd202x_blink_*_set()
  - Add define for max brightness and replace deprecated LED_FULL by it
  - Move setting led_classdev.brightness to ktd202x_brightness_*_set()
  - Move mutex_lock inside ktd202x_blink_set()
  - Add comment that 'color' property is optional (allow EINVAL)
  - Replace escaped double quotes by single quotes
  - Avoid overloading variable 'color'
  - Do not lock during probe
  - Remove usage of 'of_match_ptr'
- Document interrupt and pull-up supply, like done for aw2013[1]
- Fix error in num_steps calculation
- Link to v1: https://lore.kernel.org/r/20230618-ktd202x-v1-0-fc182fefadd7@apitzsch.eu

[1] https://lore.kernel.org/linux-leds/20230815-aw2013-vio-v3-0-2505296b0856@gerhold.net/

---
André Apitzsch (2):
      dt-bindings: leds: Add Kinetic KTD2026/2027 LED
      leds: add ktd202x driver

 .../devicetree/bindings/leds/kinetic,ktd202x.yaml  | 171 ++++++
 drivers/leds/rgb/Kconfig                           |  13 +
 drivers/leds/rgb/Makefile                          |   1 +
 drivers/leds/rgb/leds-ktd202x.c                    | 625 +++++++++++++++++++++
 4 files changed, 810 insertions(+)
---
base-commit: 165adeea3617ea22dc49f8880474ebf3a98b696d
change-id: 20230618-ktd202x-546b2a7d240b

Best regards,
-- 
André Apitzsch <git@...tzsch.eu>