linux-kernel - Re: [PATCH v6 2/2] iio: proximity: vl53l0x: add interrupt support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180928093618.GA24536@Eros>
Date:   Fri, 28 Sep 2018 17:36:18 +0800
From:   Song Qiang <songqiang1304521@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Jonathan Cameron <jic23@...nel.org>, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, mark.rutland@....com,
        andriy.shevchenko@...ux.intel.com, matt.ranostay@...sulko.com,
        tglx@...utronix.de, ak@...klinger.de, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v6 2/2] iio: proximity: vl53l0x: add interrupt support

On Wed, Sep 26, 2018 at 05:46:18PM -0500, Rob Herring wrote:
> On Sat, Sep 22, 2018 at 04:05:23PM +0100, Jonathan Cameron wrote:
> > On Tue, 18 Sep 2018 16:24:22 +0800
> > Song Qiang <songqiang1304521@...il.com> wrote:
> > 
> > > The first version of this driver issues a measuring request and polling
> > > for a status register in the device for measuring completes.
> > > vl53l0x support configuring GPIO1 on it to generate interrupt to
> > > indicate that new measurement is ready. This patch adds support for
> > > using this mechanisim to reduce cpu cost.
> > > 
> > > Signed-off-by: Song Qiang <songqiang1304521@...il.com>
> > Hi Song.
> > 
> > Looks correct in principal but a few things to tidy up before
> > this is ready to apply.
> > 
> > Also we have an unrelated change in here to check the devices ID.
> > That should be in it's own patch.
> > 
> > Thanks,
> > 
> > Jonathan
> > > ---
> > >  .../bindings/iio/proximity/vl53l0x.txt        |  14 +-
> 
> This should have been split with the complete binding in one patch 
> rather than piecemeal driver feature by feature.
> 

Hi Rob,

A few days ago when I was submitting this driver, I didn't do it very
well, the function of this driver is limited. I added interrupt support 
the next day after you acked my first patch. I thought it's not polite 
to add something after someone acked that patch, so I send the interrupt
support as a second patch. The first patch is merged to togreg now, but
this doesn't. I don't know when can I add new functions to the code that
just merged to togreg branch, could you offer some suggestions?

> > >  drivers/iio/proximity/vl53l0x-i2c.c           | 135 +++++++++++++++---
> > >  2 files changed, 129 insertions(+), 20 deletions(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/iio/proximity/vl53l0x.txt b/Documentation/devicetree/bindings/iio/proximity/vl53l0x.txt
> > > index ab9a9539fec4..40290f8dd70f 100644
> > > --- a/Documentation/devicetree/bindings/iio/proximity/vl53l0x.txt
> > > +++ b/Documentation/devicetree/bindings/iio/proximity/vl53l0x.txt
> > > @@ -4,9 +4,21 @@ Required properties:
> > >  	- compatible: must be "st,vl53l0x-i2c"
> 
> Is there more than one interface on this device, such as SPI? If not, 
> then '-i2c' should be dropped.
> 

Yes, there is a CCI(Camera Control Interface) for communication.

> > >  	- reg: i2c address where to find the device
> > >  
> > > +Optional properties:
> > > +	- interrupts : Interrupt line receiving GPIO1's measuring complete
> > > +	  output, supports IRQ_TYPE_EDGE_FALLING only.
> > > +
> > > +	Refer to interrupt-controller/interrupts.txt for generic
> > > +	interrupt client node bindings.
> > > +
> > >  Example:
> > >  
> > >  vl53l0x@29 {
> > > +	pinctrl-names = "default";
> > > +	pinctrl-0 = <&vl53l0x_pins>;
> > > +
> > Please drop this from the example.  This is board specific rather than
> > being generally required.
> > 

Sure.

yours,
Song Qiang
> > >  	compatible = "st,vl53l0x-i2c";
> > >  	reg = <0x29>;
> > > -};
> > > +	interrupt-parent = <&gpio3>;
> > > +	interrupts = <17 IRQ_TYPE_EDGE_FALLING>;
> > > +}