[U-Boot] [PATCH v3 6/9] power: axp209: Add support for voltage rate control on LDO3

Maxime Ripard maxime.ripard at bootlin.com
Thu Nov 22 08:22:13 UTC 2018


On Wed, Nov 21, 2018 at 08:05:30PM +0200, Priit Laes wrote:
> From: Olliver Schinagl <oliver at schinagl.nl>
> 
> The AXP209 LDO3 regulator supports voltage rate control, or can set a
> slew rate.
> 
> This allows for the power to gradually rise up to the desired voltage,
> instead of spiking up as fast as possible. Reason to have this can be
> to reduce the inrush currents for example.
> 
> There are 3 slopes to choose from, the default, 'none' is a voltage rise
> of 0.0167 V/uS, a 1.6 mV/uS and a 0.8 mV/uS voltage rise.
> 
> In ideal world (where vendors follow the recommended design guidelines)
> this setting should not be enabled by default. Unless of course AXP209
> crashes instead of reporting overcurrent condition as it normally should
> do in this case.
> 
> Signed-off-by: Olliver Schinagl <oliver at schinagl.nl>
> Signed-off-by: Priit Laes <plaes at plaes.org>

Acked-by: Maxime Ripard <maxime.ripard at bootlin.com>

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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