[PATCH 10/33] pcmcia: soc_common: switch to using gpio_descs

Russell King - ARM Linux
2016-09-14T12:10:56Z

On Wed, Sep 14, 2016 at 01:29:04PM +0200, Linus Walleij wrote:
> On Mon, Aug 29, 2016 at 12:24 PM, Russell King
> <rmk+kernel@armlinux.org.uk> wrote:
>
> > Switch to using the gpiod_* consumer API rather than the legacy API.
> >
> > Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
> (...)
>
> > +int soc_pcmcia_request_gpiods(struct soc_pcmcia_socket *skt)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(skt->stat); i++) {
> > + struct gpio_desc *desc;
> > +
>
> Here I inserted:
>
> /* Skip over unnamed GPIOs, assume unused */
> if (!skt->stat[i].name)
> continue;
>
> to get it working again on h3600.

Thanks, I'll add that.

> > + desc = gpiod_get(skt->socket.dev.parent,
> > + skt->stat[i].name, GPIOD_IN);
> > + if (IS_ERR(desc)) {
> > + dev_err(skt->socket.dev.parent,
> > + "Failed to get GPIO for %s: %ld\n",
> > + skt->stat[i].name, PTR_ERR(desc));
> > + __soc_pcmcia_hw_shutdown(skt, i);
> > + return PTR_ERR(desc);
> > + }
>
>
> It bugs out for me on the legacy h3600, since it only defines
> two of these pins not all of the ARRAY_SIZE(skt->stat) pins
> will succeed and we get an error message like this:
>
> sa11x0-pcmcia sa11x0-pcmcia: Failed to get GPIO for (null): -2
> sa11x0-pcmcia: probe of sa11x0-pcmcia failed with error -2
>
> With the patch above it goes away and the log is silent.
> The debugfs gpio file looks like this:
>
> cat gpio
> gpiochip0: GPIOs 0-27, gpio:
> gpio-0 ( |Power Button ) in hi
> gpio-10 ( |pcmcia1-detect ) in hi
> gpio-11 ( |pcmcia1-ready ) in hi
> gpio-17 ( |pcmcia0-detect ) in hi
> gpio-18 ( |Action button ) in hi
> gpio-21 ( |pcmcia0-ready ) in hi
> gpio-23 ( |dcd ) in hi
> gpio-25 ( |cts ) in lo
> gpio-26 ( |rts ) out lo
>
> gpiochip1: GPIOs 28-43, parent: platform/htc-egpio, htc-egpio:
> gpio-28 ( |Flash Vpp ) out lo
> gpio-29 ( |PCMCIA CARD RESET ) out lo
> gpio-30 ( |OPT RESET ) out lo
> gpio-32 ( |OPT NVRAM ON ) out lo
> gpio-33 ( |OPT ON ) out lo
> gpio-34 ( |LCD power ) out lo
> gpio-36 ( |LCD control ) out lo
> gpio-42 ( |LCD 5v ) out lo
> gpio-43 ( |LCD 9v/-6.5v ) out lo
>
> Which seems like before the patch series.

Yay.

> I still suspect the PCMCIA is not really working but I have
> limited experience of the bus so I don't really know how
> to test it deeply or have my PCMCIA ethernet or harddrive
> probe properly.

Yes, to me the H3600 code looks really really really weird - the way
H3XXX_EGPIO_CARD_RESET is "shared" (badly) between both sockets is
certainly racy. I've no idea what the semantics there are supposed
to be - I suspect that H3600 PCMCIA hasn't worked for a very long
time, or if it has, it's probably not been reliable.

> There are no regressions however, so with something like
> the above patch applied:
> Tested-by: Linus Walleij <linus.walleij@linaro.org>
>
> For the whole patch series on H3600.

Thanks!

--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.