linux-kernel - Re: [PATCH] ARM: dts: imx25-pinfunc: Always set SION for SD CMD

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Date:   Sat, 27 Jan 2018 21:43:50 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Benoît Thébaudeau 
        <benoit.thebaudeau.dev@...il.com>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Michael Nazzareno Trimarchi <michael@...rulasolutions.com>,
        Shawn Guo <shawnguo@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: dts: imx25-pinfunc: Always set SION for SD CMD

On Sat, Jan 27, 2018 at 09:37:11PM +0100, Benoît Thébaudeau wrote:
> On Sat, Jan 27, 2018 at 4:37 PM, Uwe Kleine-König
> <u.kleine-koenig@...gutronix.de> wrote:
> > On Sat, Jan 27, 2018 at 01:07:52AM +0100, Benoît Thébaudeau wrote:
> >> The eSDHC does not work properly if the SION bit is not set for the
> >> bidirectional CMD signal, whatever the eSDHC instance and the selected
> >> pad. Therefore, setting SION is mandatory for all eSDHC CMD ports. Do
> >> this for MX25_PAD_*__SD*_CMD in imx25-pinfunc.h in order to enforce this
> >> behavior for all boards.
> >>
> >> This had already been done for eSDHC1, but not for eSDHC2. Also, define
> >> MX25_PAD_FEC_MDC__SDHC2_CMD so that all the possible cases are covered
> >> from now on.
> >
> > There is an inconsistency in the naming. The eSDHC1 CMD constants are
> > named:
> >
> >         MX25_PAD_SD1_CMD__SD1_CMD
> >
> > The reference calls this:
> >
> >         CMD of instance: esdhc1.
> >
> > The register name is correct though. Not sure it's worth to fix this to
> > use consistent naming (which would result in:
> >
> >         MX25_PAD_SD1_CMD__ESDHC1_CMD
> >
> > which looks ugly, too).
> 
> Indeed. I had also noticed this. I can send a patch to apply before
> this one. But that would break the out-of-tree DT files using these
> definitions. Would that be OK?

One possibility is to do something like this:

	#define MX25_PAD_SD1_CMD__ESDHC1_CMD	X Y Z ...

	...

	/*
	 * compat defines for out-of-tree users. Yes, you should update when you
	 * make use of one of them.
	 */
	#define MX25_PAD_SD1_CMD__SD1_CMD MX25_PAD_SD1_CMD__ESDHC1_CMD

This would also allow to fix the users in a separate step.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |