linux-kernel - Re: [PATCH 4.16 269/272] pinctrl: msm: Use dynamic GPIO numbering

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Date:   Thu, 31 May 2018 13:45:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sebastian Gottschall <s.gottschall@...wrt.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Timur Tabi <timur@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: Re: [PATCH 4.16 269/272] pinctrl: msm: Use dynamic GPIO numbering

On Thu, May 31, 2018 at 01:21:56PM +0200, Sebastian Gottschall wrote:
> Am 28.05.2018 um 12:05 schrieb Greg Kroah-Hartman:
> > 4.16-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Bjorn Andersson <bjorn.andersson@...aro.org>
> > 
> > [ Upstream commit a7aa75a2a7dba32594291a71c3704000a2fd7089 ]
> > 
> > The base of the TLMM gpiochip should not be statically defined as 0, fix
> > this to not artificially restrict the existence of multiple pinctrl-msm
> > devices.
> > 
> > Fixes: f365be092572 ("pinctrl: Add Qualcomm TLMM driver")
> > Reported-by: Timur Tabi <timur@...eaurora.org>
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> > Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> >   drivers/pinctrl/qcom/pinctrl-msm.c |    2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> > +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> > @@ -818,7 +818,7 @@ static int msm_gpio_init(struct msm_pinc
> >   		return -EINVAL;
> >   	chip = &pctrl->chip;
> > -	chip->base = 0;
> > +	chip->base = -1;
> >   	chip->ngpio = ngpio;
> >   	chip->label = dev_name(pctrl->dev);
> >   	chip->parent = pctrl->dev;
> 
> this patch creates a regression for me. on ipq8064 the systems gpios now
> start somewhere in the sky
> 
> new layout
> 
> lrwxrwxrwx    1 root     root             0 Jan  1 00:00 gpiochip373 -> ../../devices/platform/soc/1b700000.pci/pci0001:00/0001:00:00.0/0001:01:00.0/gpio/gpiochip373
> lrwxrwxrwx    1 root     root             0 Jan  1 00:00 gpiochip408 -> ../../devices/platform/soc/1b500000.pci/pci0000:00/0000:00:00.0/0000:01:00.0/gpio/gpiochip408
> lrwxrwxrwx    1 root     root             0 Jan  1 00:00 gpiochip443 ->
> ../../devices/platform/soc/800000.pinmux/gpio/gpiochip443
> 
> 
> before the patch
> 
> lrwxrwxrwx    1 root     root             0 Jan  1  1970 gpiochip0 ->
> ../../devices/platform/soc/800000.pinmux/gpio/gpiochip0
> lrwxrwxrwx    1 root     root             0 May 31 13:13 gpiochip442 -> ../../devices/platform/soc/1b700000.pci/pci0001:00/0001:00:00.0/0001:01:00.0/gpio/gpiochip442
> lrwxrwxrwx    1 root     root             0 May 31 13:13 gpiochip477 -> ../../devices/platform/soc/1b500000.pci/pci0000:00/0000:00:00.0/0000:01:00.0/gpio/gpiochip477
> 
> 
> this broke my userspace gpio handling. i can override this, but still it
> doesnt look correct since there is a hole at the beginng likelly reserved by
> unused arm gpios

So does this mean that 4.17-rc is also broken for you?  If so, this
needs to be reverted there as well.

Bjorn, any ideas?

thanks,

greg k-h