linux-dev/drivers/leds/rgb, branch master

leds: pwm-multicolor: Support active-low LEDs

2022-07-17T11:02:09Z

Add support for LEDs wired up to light when the PWM output is low, just like the regular PWM LEDs. Signed-off-by: Emil Renner Berthing Reviewed-by: Geert Uytterhoeven Signed-off-by: Pavel Machek

leds: pwm-multicolor: Don't show -EPROBE_DEFER as errors

2022-07-17T11:01:43Z

When requesting a PWM it might return -EPROBE_DEFER if it hasn't probed yet. This is not an error, so just propagate the -EPROBE_DEFER without logging anything. There is already dev_err_probe for exactly this situation. Fixes: 9fa2762110dd ("leds: Add PWM multicolor driver") Signed-off-by: Emil Renner Berthing Reviewed-by: Geert Uytterhoeven Signed-off-by: Pavel Machek

leds: qcom-lpg: Require pattern to follow documentation

2022-05-24T20:08:10Z

The leds-trigger-pattern documentation describes how the brightness of the LED should transition linearly from one brightness value to the next, over the given delta_t. But the pattern engine in the Qualcomm LPG hardware only supports holding the brightness for each entry for the period. This subset of patterns can be represented in the leds-trigger-pattern by injecting zero-time transitions after each entry in the pattern, resulting in a pattern that pattern that can be rendered by the LPG. Rework LPG pattern interface to require these zero-time transitions, to make it comply with this subset of patterns and reject the patterns it can't render. Fixes: 24e2d05d1b68 ("leds: Add driver for Qualcomm LPG") Signed-off-by: Bjorn Andersson Signed-off-by: Pavel Machek

leds: qcom-lpg: add missing PWM dependency

2022-05-07T21:20:14Z

The Qualcomm LPG driver fails to probe unless PWM support is enabled so add the missing Kconfig dependency. Fixes: 24e2d05d1b68 ("leds: Add driver for Qualcomm LPG") Signed-off-by: Johan Hovold Signed-off-by: Pavel Machek

leds: Move pwm-multicolor driver into rgb directory

2022-05-07T21:09:31Z

The drivers/leds/rgb subdirectory is relatively fresh, so we move this new PWM multi-color driver into it. Signed-off-by: Sven Schwermer Signed-off-by: Pavel Machek

leds: Add pm8350c support to Qualcomm LPG driver

2022-05-04T17:31:17Z

Add pm8350c compatible and lpg_data to the driver. Signed-off-by: Satya Priya Reviewed-by: Matthias Kaehlcke Reviewed-by: Stephen Boyd Reviewed-by: Bjorn Andersson Tested-by: Douglas Anderson Signed-off-by: Pavel Machek

leds: Add driver for Qualcomm LPG

2022-05-04T07:17:31Z

The Light Pulse Generator (LPG) is a PWM-block found in a wide range of PMICs from Qualcomm. These PMICs typically comes with 1-8 LPG instances, with their output being routed to various other components, such as current sinks or GPIOs. Each LPG instance can operate on fixed parameters or based on a shared lookup-table, altering the duty cycle over time. This provides the means for hardware assisted transitions of LED brightness. A typical use case for the fixed parameter mode is to drive a PWM backlight control signal, the driver therefor allows each LPG instance to be exposed to the kernel either through the LED framework or the PWM framework. A typical use case for the LED configuration is to drive RGB LEDs in smartphones etc, for which the driver supports multiple channels to be ganged up to a MULTICOLOR LED. In this configuration the pattern generators will be synchronized, to allow for multi-color patterns. The idea of modelling this as a LED driver ontop of a PWM driver was considered, but setting the properties related to patterns does not fit in the PWM API. Similarly the idea of just duplicating the lower bits in a PWM and LED driver separately was considered, but this would not allow the PWM channels and LEDs to be configured on a per-board basis. The driver implements the more complex LED interface, and provides a PWM interface on the side of that, in the same driver. Signed-off-by: Bjorn Andersson Tested-by: Douglas Anderson Tested-by: Luca Weiss Reviewed-by: Marijn Suijten Tested-by: Marijn Suijten [On the Sony Xperia Nile Discovery, SDM630] Signed-off-by: Pavel Machek