linux-kernel - Re: [PATCH v6 1/2] iio: frequency: adrf6780: add support for ADRF6780

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Date:   Tue, 20 Jul 2021 17:52:02 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Miclaus, Antoniu" <Antoniu.Miclaus@...log.com>
Cc:     "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6 1/2] iio: frequency: adrf6780: add support for ADRF6780

On Tue, Jul 20, 2021 at 5:33 PM Miclaus, Antoniu
<Antoniu.Miclaus@...log.com> wrote:
> > From: Andy Shevchenko <andy.shevchenko@...il.com>
> > Sent: Tuesday, July 20, 2021 5:08 PM
> > On Tue, Jul 20, 2021 at 4:17 PM Miclaus, Antoniu
> > <Antoniu.Miclaus@...log.com> wrote:
> > > > From: Andy Shevchenko <andy.shevchenko@...il.com>
> > > > Sent: Friday, July 16, 2021 5:53 PM
> > > > On Fri, Jul 16, 2021 at 2:43 PM Antoniu Miclaus
> > > > <antoniu.miclaus@...log.com> wrote:

...

> > > > First question is why not to use the regmap API (I have heard it has
> > > > gained support of 17 bit)?
> > >
> > > Initially that was the plan, but after this patch:
> > >
> > https://urldefense.com/v3/__https://github.com/torvalds/linux/commit/41
> > 91f19792bf91267835eb090d970e9cd6277a65__;!!A3Ni8CS0y2Y!ptUV0YC2nfD
> > 6AdH_y5U0ziyELl4B9pDL0ubkdpFHFtrFNE_NqUS_TWm_gE-SlHV315Ak$
> > > the custom write formats for regmap allow the read only via cached
> > registers.
> > >
> > > Therefore, I preferred using spi transfers for write/read to/from the
> > device.
> >
> > Not sure I follow you. That patch is upstream. Does it prevent you
> > from switching to regmap SPI API?
>
> It does not prevent me from switching to regmap SPI API.
> It will prevent me from using regmap_read to read directly from device.
> https://github.com/torvalds/linux/commit/4191f19792bf91267835eb090d970e9cd6277a65#diff-3e0b7d2f0a55adb6573693a514cb8024a81a55da848cb22632ab5fd4dd6dd4e4R39

How? If it's the case it's a huge regression in the API and must be fixed ASAP.

-- 
With Best Regards,
Andy Shevchenko