linux-dev/drivers/leds/rgb/Kconfig, branch masterLinux kernel development work - see feature brancheshttps://git.zx2c4.com/linux-dev/atom/drivers/leds/rgb/Kconfig?h=master2022-05-07T21:20:14Zleds: qcom-lpg: add missing PWM dependency2022-05-07T21:20:14ZJohan Hovoldjohan+linaro@kernel.org2022-05-05T08:03:58Zurn:sha1:1d6a1b5e505b52777f20b9bac5c1f8624f5a8776
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 <johan+linaro@kernel.org>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
leds: Move pwm-multicolor driver into rgb directory2022-05-07T21:09:31ZSven Schwermersven.schwermer@disruptive-technologies.com2022-05-04T18:49:46Zurn:sha1:818d03b3d4ae00eeb56687d2115a930406b2c7b3
The drivers/leds/rgb subdirectory is relatively fresh, so we move this
new PWM multi-color driver into it.
Signed-off-by: Sven Schwermer <sven.schwermer@disruptive-technologies.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
leds: Add driver for Qualcomm LPG2022-05-04T07:17:31ZBjorn Anderssonbjorn.andersson@linaro.org2022-03-03T21:43:00Zurn:sha1:24e2d05d1b68981f22c984c766fabc5a93c83dba
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 <bjorn.andersson@linaro.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Tested-by: Marijn Suijten <marijn.suijten@somainline.org>
[On the Sony Xperia Nile Discovery, SDM630]
Signed-off-by: Pavel Machek <pavel@ucw.cz>