linux-kernel - Re: [PATCH V3 2/2] pinctrl: Add Pistachio SoC pin control driver

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Date:	Tue, 28 Apr 2015 20:24:21 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...tec.com>
To:	Andrew Bresticker <abrestic@...omium.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	"Ralf Baechle" <ralf@...ux-mips.org>
CC:	<devicetree@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
	<linux-mips@...ux-mips.org>, <linux-kernel@...r.kernel.org>,
	James Hartley <james.hartley@...tec.com>,
	James Hogan <james.hogan@...tec.com>,
	"Damien Horsley" <Damien.Horsley@...tec.com>,
	Govindraj Raja <govindraj.raja@...tec.com>,
	Kevin Cernekee <cernekee@...omium.org>,
	"Paul Bolle" <pebolle@...cali.nl>
Subject: Re: [PATCH V3 2/2] pinctrl: Add Pistachio SoC pin control driver

Andrew,

On 04/07/2015 04:44 PM, Andrew Bresticker wrote:
[..]
> +static int pistachio_pinmux_enable(struct pinctrl_dev *pctldev,
> +				   unsigned func, unsigned group)
> +{
> +	struct pistachio_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
> +	const struct pistachio_pin_group *pg = &pctl->groups[group];
> +	const struct pistachio_function *pf = &pctl->functions[func];
> +	struct pinctrl_gpio_range *range;
> +	unsigned int i;
> +	u32 val;
> +
> +	if (pg->mux_reg > 0) {
> +		for (i = 0; i < ARRAY_SIZE(pg->mux_option); i++) {
> +			if (pg->mux_option[i] == func)
> +				break;
> +		}
> +		if (i == ARRAY_SIZE(pg->mux_option)) {
> +			dev_err(pctl->dev, "Cannot mux pin %u to function %u\n",
> +				group, func);
> +			return -EINVAL;
> +		}
> +
> +		val = pctl_readl(pctl, pg->mux_reg);
> +		val &= ~(pg->mux_mask << pg->mux_shift);
> +		val |= i << pg->mux_shift;
> +		pctl_writel(pctl, val, pg->mux_reg);
> +
> +		if (pf->scenarios) {
> +			for (i = 0; i < pf->nscenarios; i++) {
> +				if (pf->scenarios[i] == group)
> +					break;
> +			}
> +			if (WARN_ON(i == pf->nscenarios))
> +				return -EINVAL;
> +
> +			val = pctl_readl(pctl, pf->scenario_reg);
> +			val &= ~(pf->scenario_mask << pf->scenario_shift);
> +			val |= i << pf->scenario_shift;
> +			pctl_writel(pctl, val, pf->scenario_reg);
> +		}
> +	}
> +
> +	range = pinctrl_find_gpio_range_from_pin(pctl->pctldev, group);
> +	if (range)
> +		gpio_disable(gc_to_bank(range->gc), group - range->pin_base);
> +

If you plan to submit a v4, how about using "pg->pins" here instead of "group"?

Using "group" relies on having the same numberspace for the group and the pin,
and it'll break when introducing the RPU pinctrl.

Thanks!
-- 
Ezequiel
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