linux-kernel - Re: [PATCH v2 02/10] pinctrl: axp209: add pinctrl features

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Message-ID: <20170926132709.od3myumh5xtungvs@flea>
Date:   Tue, 26 Sep 2017 15:27:09 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:     linus.walleij@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        wens@...e.org, linux@...linux.org.uk, lee.jones@...aro.org,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...glegroups.com, thomas.petazzoni@...e-electrons.com
Subject: Re: [PATCH v2 02/10] pinctrl: axp209: add pinctrl features

On Tue, Sep 26, 2017 at 01:08:21PM +0000, Quentin Schulz wrote:
> Hi Maxime,
> 
> On 26/09/2017 15:00, Maxime Ripard wrote:
> > On Tue, Sep 26, 2017 at 12:17:12PM +0000, Quentin Schulz wrote:
> >> +static const struct axp20x_desc_pin axp209_pins[] = {
> >> +	AXP20X_PIN(AXP20X_PINCTRL_PIN(0, "GPIO0"),
> >> +		   AXP20X_FUNCTION(0x0, "gpio_out"),
> >> +		   AXP20X_FUNCTION(0x2, "gpio_in"),
> >> +		   AXP20X_FUNCTION(0x3, "ldo"),
> >> +		   AXP20X_FUNCTION(0x4, "adc")),
> >> +	AXP20X_PIN(AXP20X_PINCTRL_PIN(1, "GPIO1"),
> >> +		   AXP20X_FUNCTION(0x0, "gpio_out"),
> >> +		   AXP20X_FUNCTION(0x2, "gpio_in"),
> >> +		   AXP20X_FUNCTION(0x3, "ldo"),
> >> +		   AXP20X_FUNCTION(0x4, "adc")),
> >> +	AXP20X_PIN(AXP20X_PINCTRL_PIN(2, "GPIO2"),
> >> +		   AXP20X_FUNCTION(0x0, "gpio_out"),
> >> +		   AXP20X_FUNCTION(0x2, "gpio_in")),
> >> +};
> > 
> > If all the functions are the same, and at the same offset, can't we
> > just hardcode it, instead of having (and duplicate) all the logic
> > below?
> > 
> 
> AXP20X_PIN(AXP20X_PINCTRL_PIN(0, "GPIO0"),
> 		AXP20X_GPIO_OUT,
> 		AXP20X_GPIO_IN,
> 		AXP20X_LDO,
> 		AXP20X_ADC))
> 
> That's what you mean?

What I mean is:

static int axp20x_get_func(char *func)
{
	if (!strcmp(func, "gpio_out"))
		return 0;

	if (!strcmp(func, "gpio_in"))
		return 2;
 
	if (!strcmp(func, "ldo"))
 		return 3;
 
	if (!strcmp(func, "adc"))
 		return 4;

	return -EINVAL;
}

> >> +	pctrl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctrl_desc), GFP_KERNEL);
> >> +	if (!pctrl_desc)
> >> +		return -ENOMEM;
> >> +
> >> +	pctrl_desc->name = dev_name(&pdev->dev);
> >> +	pctrl_desc->owner = THIS_MODULE;
> >> +	pctrl_desc->pins = pins;
> >> +	pctrl_desc->npins = gpio->desc->npins;
> >> +	pctrl_desc->pctlops = &axp20x_pctrl_ops;
> >> +	pctrl_desc->pmxops = &axp20x_pmx_ops;
> > 
> > The strict flag needs to be set too in order to avoid concurrent uses
> > of GPIO and other functions.
> > 
> 
> Strict is a property of pinmux_ops struct (pmxops) and it is set.

Ah, right, my bad.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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