linux-kernel - Re: [PATCH] mfd: palmas: provide irq flags through DT/platform data

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Date:	Fri, 1 Mar 2013 20:43:52 +0800
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	sameo@...ux.intel.com, gg@...mlogic.co.uk,
	linux-kernel@...r.kernel.org, swarren@...dia.com,
	ian@...mlogic.co.uk
Subject: Re: [PATCH] mfd: palmas: provide irq flags through DT/platform data

On Fri, Mar 01, 2013 at 06:04:56PM +0530, Laxman Dewangan wrote:

> Currently driver sets the irq type to IRQF_TRIGGER_LOW which is
> causing interrupt registration failure in ARM based SoCs as:
> [    0.208479] genirq: Setting trigger mode 8 for irq 118 failed (gic_set_type+0x0/0xf0)
> [    0.208513] dummy 0-0059: Failed to request IRQ 118: -22

This can't be a generic problem on ARM systems, I'm pretty sure the
primary users of palmas would've noticed, this is more of a new feature
isn't it?

> +	/* Change interrupt line output polarity */
> +	ret = palmas_read(palmas, PALMAS_PU_PD_OD_BASE,
> +				PALMAS_POLARITY_CTRL, &reg);
> +	if (ret < 0) {
> +		dev_err(palmas->dev, "POLARITY_CTRL read failed: %d\n", ret);
> +		goto err;
> +	}
> +
> +	if (pdata->irq_flags & IRQ_TYPE_LEVEL_HIGH)
> +		reg |= PALMAS_POLARITY_CTRL_INT_POLARITY;
> +	else
> +		reg &= ~PALMAS_POLARITY_CTRL_INT_POLARITY;
> +	ret = palmas_write(palmas, PALMAS_PU_PD_OD_BASE,
> +			PALMAS_POLARITY_CTRL, reg);
> +	if (ret < 0) {
> +		dev_err(palmas->dev, "POLARITY_CTRL write failed: %d\n", ret);
> +		goto err;
> +	}

Isn't there a read/modify/write call for palmas?

Otherwise looks good; I wonder if we even need the platform data though
I can't see it hurting.

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