linux-kernel - Re: About gpio-regulator setting on DT

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Date:	Wed, 29 Jan 2014 16:08:30 -0800 (PST)
From:	Kuninori Morimoto <kuninori.morimoto.gx@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Lee Jones <lee.jones@...aro.org>, Simon <horms@...ge.net.au>,
	Magnus <magnus.damm@...il.com>,
	Linux-SH <linux-sh@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: About gpio-regulator setting on DT


Hi Mark

> The combination of the enable-active-high and enable-at-boot properties
> ought be able to cause the driver to do the right thing, the flags do
> this:
> 
> 	if (config->enabled_at_boot) {
> 		if (config->enable_high)
> 			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
> 		else
> 			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
> 	} else {
> 		if (config->enable_high)
> 			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
> 		else
> 			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
> 	}
> 
> of_get_named_gpio() just looks up the GPIO number, it doesn't request
> the GPIO.

Hmm...
I'm not sure detail,
but, I need config->gpios[ptr].flags instead of cfg.ena_gpio_flags.
Because it is used for drvdata->state.

static int gpio_regulator_probe(struct platform_device *pdev)
{
    if (np) {
        config = of_get_gpio_regulator_config(&pdev->dev, np);
        if (IS_ERR(config))
            return PTR_ERR(config);
    }
    ...

    /* build initial state from gpio init data. */
    state = 0;
    for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) {
        if (config->gpios[ptr].flags & GPIOF_OUT_INIT_HIGH)     <== we need this
               state |= (1 << ptr);
    }
    drvdata->state = state;
    ...

    cfg.ena_gpio_invert = !config->enable_high;
    if (config->enabled_at_boot) {
        if (config->enable_high)
             cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
        else
             cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
    } else {
         if (config->enable_high)
             cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
         else
             cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
    }

)

Best regards
---
Kuninori Morimoto
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