From mboxrd@z Thu Jan 1 00:00:00 1970 From: contact@paulk.fr (Paul Kocialkowski) Date: Wed, 23 Dec 2015 12:50:20 +0100 Subject: [PATCH 3/6] regulator: lp872x: Remove warning about invalid DVS GPIO In-Reply-To: <20151223114126.GR16023@sirena.org.uk> References: <1450868319-20513-1-git-send-email-contact@paulk.fr> <1450868319-20513-4-git-send-email-contact@paulk.fr> <20151223114126.GR16023@sirena.org.uk> Message-ID: <1450871420.2648.6.camel@collins> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Le mercredi 23 d?cembre 2015 ? 11:41 +0000, Mark Brown a ?crit : > On Wed, Dec 23, 2015 at 11:58:36AM +0100, Paul Kocialkowski wrote: > > Some devices don't hook the DVS pin to a GPIO but to ground or VCC. > > In those cases, it is not a problem to have no DVS GPIO. > > I would expect the driver at least needs to know how the pins or > strapped, or otherwise have configuration for ignoring the input on the > pins. This just deletes the warnings, it doesn't have any handling for > this case that I can see. When the DVS GPIO is invalid, lp872x_init_dvs jumps to the set_default_dvs_mode label, which instructs the chip not to use the DVS pin at all and do it all in software instead (by clearing the LP8720_EXT_DVS_M bit in the LP872X_GENERAL_CFG register). That is reflected later in the code, when setting the bucks (the DVS pin only applies to the bucks) by checking for the LP8720_EXT_DVS_M bit on the LP872X_GENERAL_CFG register (in lp872x_select_buck_vout_addr) to decide whether to use software or hardware DVS selection. As far as I understood, everything goes well when the GPIO is invalid. -- Paul Kocialkowski, Replicant developer Replicant is a fully free Android distribution running on several devices, a free software mobile operating system putting the emphasis on freedom and privacy/security. Website: https://www.replicant.us/ Blog: https://blog.replicant.us/ Wiki/tracker/forums: https://redmine.replicant.us/ -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: This is a digitally signed message part URL: