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Subject: Re: [PATCH 4.16 269/272] pinctrl: msm: Use dynamic GPIO numbering
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        Timur Tabi <timur@codeaurora.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Sasha Levin <alexander.levin@microsoft.com>
References: <20180528100240.256525891@linuxfoundation.org>
 <20180528100302.722883806@linuxfoundation.org>
 <7c34ccef-2fa8-8b53-2677-29f6fbe71a04@dd-wrt.com>
 <20180531114553.GB11598@kroah.com>
From:   Sebastian Gottschall <s.gottschall@dd-wrt.com>
Message-ID: <d2ed4f7c-f97c-ba51-6f33-d329da69dbc6@dd-wrt.com>
Date:   Thu, 31 May 2018 13:53:52 +0200
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Am 31.05.2018 um 13:45 schrieb Greg Kroah-Hartman:
> 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@linaro.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@codeaurora.org>
>>> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
>>> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
>>> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
>>> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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
i checked initially 4.9 with latest patches and 4.14 and reverted this 
line to get back to the old behaviour but a which view in the current 
4.17 tree shows
that the same patch has been included in 4.17. it was introduced in the 
kernel mainline on 12.feb 2018
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/pinctrl/qcom/pinctrl-msm.c?h=v4.17-rc7&id=a7aa75a2a7dba32594291a71c3704000a2fd7089
>