From mboxrd@z Thu Jan 1 00:00:00 1970 From: Charles Keepax Subject: Re: [alsa-devel] [PATCH v3 1/2] extcon: arizona: Add support for select accessory detect mode when headphone detection Date: Sat, 25 Apr 2015 13:50:25 +0100 Message-ID: <20150425125025.GI3480@opensource.wolfsonmicro.com> References: <1429701801-25287-1-git-send-email-ideal.song@samsung.com> <1429701801-25287-2-git-send-email-ideal.song@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1429701801-25287-2-git-send-email-ideal.song-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Inha Song Cc: lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, alsa-devel-K7yf7f+aM1XWsZ/bQMPhNw@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, patches-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org, cw00.choi-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, rf-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, pawel.moll-5wv7dgnIgG8@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org List-Id: alsa-devel@alsa-project.org On Wed, Apr 22, 2015 at 08:23:20PM +0900, Inha Song wrote: > This patch add support for select accessory detect mode to HPDETL or HPDETR. > Arizona provides a headphone detection circuit on the HPDETL and HPDETR pins > to measure the impedance of an external load connected to the headphone. > > Depending on board design, headphone detect pins can change to HPDETR or HPDETL. > > Signed-off-by: Inha Song > --- > > +static int arizona_extcon_of_get_pdata(struct arizona *arizona) > +{ > + struct arizona_pdata *pdata = &arizona->pdata; > + unsigned int val; I would rather this is "unsigned int val = ARIZONA_ACCDET_MODE_HPL;". > + > + of_property_read_u32(arizona->dev->of_node, "wlf,hpdet-channel", &val); Because this won't fill val if the DT entry isn't present. > + switch (val) { Which means we hit this with val uninitialised. > + case ARIZONA_ACCDET_MODE_HPL: > + case ARIZONA_ACCDET_MODE_HPR: So we may select either channel at random. > + pdata->hpdet_channel = val; > + break; > + default: > + dev_err(arizona->dev, > + "Wrong wlf,hpdet-channel DT value %d\n", val); Or most likely just print an error but the DT being missing shouldn't really be an error it is an optional entry. > + pdata->hpdet_channel = ARIZONA_ACCDET_MODE_HPL; > + } > + > + return 0; > +} Thanks, Charles -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html