Re: [PATCH v6 5/8] iio: adc: fsl,imx25-gcq driver

Hi,

On Thu, Jan 29, 2015 at 08:00:49PM +0530, Varka Bhadram wrote:

Hi,

On Thursday 29 January 2015 07:39 PM, Markus Pargmann wrote:

quoted

This is a conversion queue driver for the mx25 SoC. It uses the central
ADC which is used by two seperate independent queues. This driver
prepares different conversion configurations for each possible input.
For a conversion it creates a conversionqueue of one item with the
correct configuration for the chosen channel. It then executes the queue
once and disables the conversion queue afterwards.

The reference voltages are configurable through devicetree subnodes,
depending on the connections of the ADC inputs.

Signed-off-by: Markus Pargmann <redacted>
Signed-off-by: Denis Carikli <redacted>
Signed-off-by: Markus Pargmann <redacted>
---
 drivers/iio/adc/Kconfig                     |   7 +
 drivers/iio/adc/Makefile                    |   1 +
 drivers/iio/adc/fsl-imx25-gcq.c             | 361 ++++++++++++++++++++++++++++
 include/dt-bindings/iio/adc/fsl-imx25-gcq.h |  18 ++
 4 files changed, 387 insertions(+)
 create mode 100644 drivers/iio/adc/fsl-imx25-gcq.c
 create mode 100644 include/dt-bindings/iio/adc/fsl-imx25-gcq.h

(...)

quoted

+static int mx25_gcq_probe(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev;
+	struct mx25_gcq_priv *priv;
+	struct mx25_tsadc *tsadc = dev_get_drvdata(pdev->dev.parent);
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	void __iomem *mem;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	priv = iio_priv(indio_dev);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mem = devm_ioremap_resource(dev, res);
+	if (!mem)
+		return -ENOMEM;
+
+	priv->regs = devm_regmap_init_mmio(dev, mem, &mx25_gcq_regconfig);
+	if (IS_ERR(priv->regs)) {
+		dev_err(dev, "Failed to initialize regmap\n");
+		return PTR_ERR(priv->regs);
+	}
+
+	init_completion(&priv->completed);
+
+	/* Optional external regulator */
+	priv->ext_vref = devm_regulator_get(&pdev->dev, "vref");
+	if (!IS_ERR_OR_NULL(priv->ext_vref)) {
+		ret = regulator_enable(priv->ext_vref);
+		if (ret)
+			return ret;
+	}
+
+	ret = mx25_gcq_setup_cfgs(pdev, priv);
+	if (ret)
+		return ret;
+
+	priv->clk = tsadc->clk;
+	ret = clk_prepare_enable(priv->clk);
+	if (ret) {
+		dev_err(dev, "Failed to enable clock\n");
+		return ret;
+	}
+
+	priv->irq = platform_get_irq(pdev, 0);
+	if (priv->irq <= 0) {
+		dev_err(dev, "Failed to get IRQ\n");
+		ret = priv->irq;
+		goto err_clk_unprepare;
+	}
+
+	ret = request_irq(priv->irq, mx25_gcq_irq, 0, pdev->name, priv);

Use of devm_* API

It seems to be save to use it here, as the interrupt handler only uses
memory allocated for this driver and not the iio framework. So I will
probably change it to devm_*.

Thanks,

Markus

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