From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Torokhov Subject: Re: [PATCH 2/2] HID: i2c-hid: support regulator power on/off Date: Fri, 2 Dec 2016 15:00:13 -0800 Message-ID: <20161202230013.GA18268@dtor-ws> References: <1480717140-14558-1-git-send-email-briannorris@chromium.org> <1480717140-14558-2-git-send-email-briannorris@chromium.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-pg0-f66.google.com ([74.125.83.66]:33693 "EHLO mail-pg0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751307AbcLBXAR (ORCPT ); Fri, 2 Dec 2016 18:00:17 -0500 Content-Disposition: inline In-Reply-To: <1480717140-14558-2-git-send-email-briannorris@chromium.org> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Brian Norris Cc: Jiri Kosina , Benjamin Tissoires , Caesar Wang , linux-rockchip@lists.infradead.org, Rob Herring , linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Rutland , Doug Anderson On Fri, Dec 02, 2016 at 02:19:00PM -0800, Brian Norris wrote: > On some boards, we need to enable a regulator before using the HID, and > it's also nice to save power in suspend by disabling it. Support an > optional "vdd-supply" and a companion initialization delay. > > Signed-off-by: Brian Norris > Signed-off-by: Caesar Wang > Cc: Jiri Kosina > Cc: linux-input@vger.kernel.org > --- > v2: > * support compatible property for wacom, with specific "vdd-supply" > * name > * support the 100ms delay needed for this digitizer > * target regulator support only at specific device > > v3: > * drop Wacom specifics and allow this to be used generically > * add "init-delay-ms" property support > > v4: > * use devm_regulator_get() (with a 'dummy' regulator for most cases) > instead of _optional() version, to make code less conditional (Dmitry) > * fix but where 'init_delay_ms' wasn't getting assigned properly > * disable regulator in probe() failure path > --- > drivers/hid/i2c-hid/i2c-hid.c | 44 +++++++++++++++++++++++++++++++++++++++++-- > include/linux/i2c/i2c-hid.h | 6 ++++++ > 2 files changed, 48 insertions(+), 2 deletions(-) > > diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c > index b3ec4f2de875..5c6e037613d7 100644 > --- a/drivers/hid/i2c-hid/i2c-hid.c > +++ b/drivers/hid/i2c-hid/i2c-hid.c > @@ -38,6 +38,7 @@ > #include > #include > #include > +#include > > #include > > @@ -937,6 +938,10 @@ static int i2c_hid_of_probe(struct i2c_client *client, > } > pdata->hid_descriptor_address = val; > > + ret = of_property_read_u32(dev->of_node, "init-delay-ms", &val); > + if (!ret) > + pdata->init_delay_ms = val; > + > return 0; > } > > @@ -983,6 +988,15 @@ static int i2c_hid_probe(struct i2c_client *client, > ihid->pdata = *platform_data; > } > > + ihid->pdata.supply = devm_regulator_get(&client->dev, "vdd"); Oh, haveni't noticed that the rest of the driver does not use devm. Well, I'll leave it up to hid-i2c folks to decide if they are OK with mixing up the managed and non-managed resources, it seems safe to me in this case. Reviewed-by: Dmitry Torokhov Thanks. -- Dmitry