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| author | Brian Norris <briannorris@chromium.org> | 2016-06-10 12:39:57 -0700 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2016-06-29 10:06:21 +0100 |
| commit | 602553073892c18f723f8aa090153a23b1312a16 (patch) | |
| tree | f6b898ed187ef7cf1134e46bf914f49732a783cc /COPYING | |
| parent | af8c34ce6ae32addda3788d54a7e340cad22516b (diff) | |
| download | linux-602553073892c18f723f8aa090153a23b1312a16.tar.bz2 | |
backlight: lp855x: Add enable regulator
The LP8556 datasheet describes an EN/VDDIO input, which serves "both as
a chip enable and as a power supply reference for PWM, SDA, and SCL
inputs." The LP8556 that I'm testing doesn't respond properly if I try
to talk I2C to it too quickly after enabling VDDIO, and the LP8555
datasheet mentions a t_RESPONSE delay of up to 1 millisecond.
Support this EN/VDDIO by adding a regulator property to the binding;
enabling this regulator at probe time; and sleeping for 1 to 2ms, if the
EN/VDDIO regulator was provided.
Signed-off-by: Brian Norris <briannorris@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Milo Kim <milo.kim@ti.com>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'COPYING')
0 files changed, 0 insertions, 0 deletions