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Subject: Re: [PATCH v2] gpio: pca953x: add support for open drain pins on
 PCAL6524
Thread-Topic: [PATCH v2] gpio: pca953x: add support for open drain pins on
 PCAL6524
Thread-Index: AQHXAJ6Y8nHh4lzybEC6MhBJ7Xlm+6pZMfQAgAHQ7QCAABRygIABRDKAgAATDICAAE2ggA==
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On Wed, 2021-02-17 at 16:19 +0200, Andy Shevchenko wrote:
> On Wed, Feb 17, 2021 at 3:11 PM Bedel, Alban <alban.bedel@aerq.com>
> wrote:
> > On Tue, 2021-02-16 at 19:50 +0200, Andy Shevchenko wrote:
> > > On Tue, Feb 16, 2021 at 6:37 PM Bedel, Alban <
> > > alban.bedel@aerq.com>
> > > wrote:
> > > > On Mon, 2021-02-15 at 14:53 +0200, Andy Shevchenko wrote:
> > > > > On Thu, Feb 11, 2021 at 7:52 PM Alban Bedel <
> > > > > alban.bedel@aerq.com
> > > > > wrote:
>=20
> ...
>=20
> > > > > > +#define PCAL65xx_REGS          BIT(10)
> > > > >=20
> > > > > Can we have it as a _TYPE, please?
> > > >=20
> > > > Let's please take a closer look at these macros and what they
> > > > mean.
> > > > Currently we have 3 possible set of functions that are
> > > > indicated by
> > > > setting bits in driver_data using the PCA_xxx macros:
> > > >=20
> > > > - Basic register only: 0
> > > > - With interrupt support: PCA_INT
> > > > - With latching interrupt regs: PCA_INT | PCA_PCAL =3D
> > > > PCA_LATCH_INT
> > > >=20
> > > > This patch then add a forth case:
> > > >=20
> > > > - With pin config regs: PCA_INT | PCA_PCAL |
> > > > $MACRO_WE_ARE_DICUSSING
> > > >=20
> > > > Then there is the PCA953X_TYPE and PCA957X_TYPE macros which
> > > > indicate
> > > > the need for a different regmap config and register layout.
> > >=20
> > > Exactly, and you have a different register layout (coincidentally
> > > overlaps with the original PCA953x).
> >=20
> > We have 2 layout for the base registers, the "mixed up registers"
> > of
> > the PCA957x and the "standard" of the PCA953x. Then we have the
> > PCALxxxx chips which extend the base PCA953x registers with further
> > registers for better interrupt handling. These are not treated as a
> > new
> > type in the current code, but as an extra feature on top of the
> > PCA953x.
>=20
> Yes, because they are about interrupts AFAICS.

This distinction seems arbitrary, each more advanced version of the
chip just has more features along with a new register block.

> >  The PCAL65xx we are talking about add a further register
> > block, so following the existing concept its not a new layout.
>=20
> Yes, with one important detail, i.e. it extends the "mixed up"
> registers, it's not a separate "feature" in this sense. The separate
> "feature" can be, for example, PWM registers. I admit that this most
> of the angle of preference how to draw a line between the features.
>=20
> I prefer to see it as a type because of two things (in the current
> code):
>  - OF_9*() macros take only two arguments, second of which is
> Interrupt related
>  - PCA_INT group of bits is about Interrupt only

No, the register set indicated by PCA_PCAL also allow setting pull
up/down which is supported by this driver. Furthermore the extra
registers of the PCAL65XX also allow configuring edge triggered mode
for interrupts. I really don't see why there should be 2 class of
features, that only make the code more complex.

> Your proposal will disrupt the code (more invasive).

I tried to implement what you like to see:

 1 file changed, 105 insertions(+), 20 deletions(-)

vs my proposal:

 1 file changed, 65 insertions(+), 3 deletions(-)

Alban


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