linux-kernel - Re: [PATCH v4 3/6] pinctrl: mediatek: avoid virtual gpio trying to set reg

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Date:   Wed, 25 Mar 2020 17:22:23 +0800
From:   Yingjoe Chen <yingjoe.chen@...iatek.com>
To:     Hanks Chen <hanks.chen@...iatek.com>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...nel.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>, Andy Teng <andy.teng@...iatek.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        Mars Cheng <mars.cheng@...iatek.com>
Subject: Re: [PATCH v4 3/6] pinctrl: mediatek: avoid virtual gpio trying to
 set reg

On Wed, 2020-03-25 at 16:12 +0800, Hanks Chen wrote:
> for virtual gpios, they should not do reg setting and
> should behave as expected for eint function.
> 
> Change-Id: I913501f21c841c2cb981530cd387395648f83984

Please remove Change-Id:


> Signed-off-by: Hanks Chen <hanks.chen@...iatek.com>
> Signed-off-by: Mars Cheng <mars.cheng@...iatek.com>
> ---
>  drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c |   28 ++++++++++++++++++++++
>  drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h |    1 +
>  drivers/pinctrl/mediatek/pinctrl-paris.c         |    7 ++++++
>  3 files changed, 36 insertions(+)
> 
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> index 20e1c89..087d233 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> @@ -226,6 +226,31 @@ static int mtk_xt_find_eint_num(struct mtk_pinctrl *hw, unsigned long eint_n)
>  	return EINT_NA;
>  }
>  
> +/*
> + * Virtual GPIO only used inside SOC and not being exported to outside SOC.
> + * Some modules use virtual GPIO as eint (e.g. pmif or usb).
> + * In MTK platform, external interrupt (EINT) and GPIO is 1-1 mapping
> + * and we can set GPIO as eint.
> + * But some modules use specific eint which doesn't have real GPIO pin.
> + * So we use virtual GPIO to map it.
> + */
> +
> +bool mtk_is_virt_gpio(struct mtk_pinctrl *hw, unsigned int gpio_n)
> +{
> +	const struct mtk_pin_desc *desc;
> +	bool virt_gpio = false;
> +
> +	if (gpio_n >= hw->soc->npins)
> +		return virt_gpio;
> +
> +	desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio_n];
> +
> +	if (desc->funcs && !desc->funcs[desc->eint.eint_m].name)
> +		virt_gpio = true;

I think removing virt_gpio and just return true/false for this function
will make it easier to read.

Joe.C

> +
> +	return virt_gpio;
> +}