linux-kernel - Re: [PATCH 2/2] ARM: dts: am335x: Replaced register offsets with defines

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Message-ID: <20190314161233.GD19425@atomide.com>
Date:   Thu, 14 Mar 2019 09:12:33 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Christina Quast <cquast@...overdisplays.com>
Cc:     "bcousson@...libre.com" <bcousson@...libre.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "mpfj@...flow.co.uk" <mpfj@...flow.co.uk>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ARM: dts: am335x: Replaced register offsets with
 defines

* Christina Quast <cquast@...overdisplays.com> [190314 16:03]:
> On 14/03/2019 16:05, Tony Lindgren wrote:
> > * Christina Quast <cquast@...overdisplays.com> [190313 14:28]:
> >> The defines are taken from dt-bindings/pinctrl/am335x.h
> >>
> >> Updated AM33XX_IOPAD to take three instead of two parameters:
> >> AM33XX_IOPAD(register_offset, pin_direction_pullups, mux_mode)
> > Thanks that works great for making things work eventually
> > with #pinctrl-cells = <2> :)
> >
> >> +			AM33XX_IOPAD(AM335X_PIN_UART1_RXD, PIN_INPUT, MUX_MODE0)      /* uart1_rxd */
> >> +			AM33XX_IOPAD(AM335X_PIN_UART1_TXD, PIN_INPUT, MUX_MODE0)      /* uart1_txd *
> > Since it sounds like you're modifying these with a script,
> Who would do such a change by hand, anyways? That's too error-prone!

Right :)

> > just leave out any nop comments while at it where the comment
> > is just the pad name already there in the new register
> > define. Some comments might need to be preserved, but my
> > guess is that they're mostly just the pad name.
> >
> > And I suggest you split this change to a seprate patch
> > for each board so in case of trouble we can revert the
> > changes for a single board if needed.
> Is it really useful to have a change per board? Once the AM33XX_IOPAD
> macro is changed and takes 3 arguments instead of 2, the old boards will
> not compile anymore anyways.

That's a good point. How about use some different name for
the new macro? Something like AM33XX_PADCONF maybe?

Note that there is a huge number of out-of-tree board specific
dts files for various devices. So let's also keep the old
macro for now. We could make produce a warning, then we can
drop it later on few merge cycles later.

Regards,

Tony