linux-kernel - Re: [PATCH] pinctrl: msm: Use dynamic GPIO numbering

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Date:   Fri, 23 Oct 2020 19:51:45 +0530
From:   Arun KS <arunks.linux@...il.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Timur Tabi <timur@...eaurora.org>,
        Arun KS <getarunks@...il.com>
Subject: Re: [PATCH] pinctrl: msm: Use dynamic GPIO numbering

On Mon, Jan 29, 2018 at 8:30 AM Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> 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.

Can someone please provide the details why this is needed for
pinctrl-msm.  Is there any msm-chipset using multiple tlmm devices?  I
m only concerned because, after this change, the use of gpio number
from user space has become a little difficult. Can we merge the patch
from Timur to maintain the past behavior when multiple tlmm devices
are not present, which is most likely the case?

     static int base = 0;

     chip->base = base;
     base = -1;

Regards,
Arun

>
> Fixes: f365be092572 ("pinctrl: Add Qualcomm TLMM driver")
> Reported-by: Timur Tabi <timur@...eaurora.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/pinctrl/qcom/pinctrl-msm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index 495432f3341b..95e5c5ea40af 100644
> --- 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_pinctrl *pctrl)
>                 return -EINVAL;
>
>         chip = &pctrl->chip;
> -       chip->base = 0;
> +       chip->base = -1;
>         chip->ngpio = ngpio;
>         chip->label = dev_name(pctrl->dev);
>         chip->parent = pctrl->dev;
> --
> 2.15.0
>
> --
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