linux-kernel - Re: [PATCH V2] i2c-designware: Add Intel Baytrail PMIC I2C bus support

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Date:	Tue, 11 Nov 2014 13:50:28 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"David E. Box" <david.e.box@...ux.intel.com>
Cc:	wsa@...-dreams.de, jdelvare@...e.de, arnd@...db.de,
	maxime.ripard@...e-electrons.com, dianders@...omium.org,
	u.kleine-koenig@...gutronix.de,
	laurent.pinchart+renesas@...asonboard.com,
	boris.brezillon@...e-electrons.com, maxime.coquelin@...com,
	andrew@...n.ch, sjg@...omium.org, markus.mayer@...aro.org,
	ch.naveen@...sung.com, jacob.jun.pan@...ux.intel.com,
	max.schwarz@...ine.de, skuribay@...ox.com,
	Romain.Baeriswyl@...lis.com, wenkai.du@...el.com,
	chiau.ee.chew@...el.com, christian.ruppert@...lis.com,
	alan@...ux.intel.com, linux-kernel@...r.kernel.org,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH V2] i2c-designware: Add Intel Baytrail PMIC I2C bus
 support

On Tue, Sep 23, 2014 at 11:40:26AM -0700, David E. Box wrote:
> +void baytrail_evaluate_sem(struct dw_i2c_dev *dev)
> +{
> +	acpi_status status;
> +	unsigned long long shared_host = 0;
> +	acpi_handle handle;
> +
> +	if (!dev || !dev->dev) {
> +		pr_err("%s:%d: device is NULL\n", __func__, __LINE__);

Not sure if it is useful to print things like above.

> +		return;
> +	}
> +
> +	handle = ACPI_HANDLE(dev->dev);
> +	if (!handle)
> +		return;
> +
> +	status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);

Maybe it is better to check first if the operation succeeded before
touching shared_host?

	if (ACPI_SUCCESS(status) && shared_host) {
	}

Otherwise ACPI parts look good to me.

> +
> +	if (shared_host) {
> +		dev_info(dev->dev, "I2C bus managed by PUNIT\n");
> +		dev->has_hw_lock = true;
> +		dev->pm_runtime_disabled = true;
> +	}
> +}
> +EXPORT_SYMBOL(baytrail_evaluate_sem);
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