Re: [PATCH v2 1/8] mfd: AXP20x: Add mfd driver for AXP20x PMIC

This patch introduces the preliminary support for PMICs X-Powers AXP202
and AXP209. The AXP209 and AXP202 are the PMUs (Power Management Unit)
used by A10, A13 and A20 SoCs and developed by X-Powers, a sister company
of Allwinner.

The core enables support for two subsystems:
- PEK (Power Enable Key)
- Regulators

Signed-off-by: Carlo Caione <redacted>
---
 drivers/mfd/Kconfig        |  12 +++
 drivers/mfd/Makefile       |   1 +
 drivers/mfd/axp20x.c       | 247 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/axp20x.h | 179 ++++++++++++++++++++++++++++++++
 4 files changed, 439 insertions(+)
 create mode 100644 drivers/mfd/axp20x.c
 create mode 100644 include/linux/mfd/axp20x.h

[...]

+/*
+ * axp20x.c - mfd core driver for the X-Powers AXP202 and AXP209

MFD

[...]

+static struct resource axp20x_pek_resources[] = {
+	{
+		.name	= "PEK_DBR",
+		.start	= AXP20X_IRQ_PEK_RIS_EDGE,
+		.end	= AXP20X_IRQ_PEK_RIS_EDGE,
+		.flags	= IORESOURCE_IRQ,
+	},
+	{
+		.name	= "PEK_DBF",
+		.start	= AXP20X_IRQ_PEK_FAL_EDGE,
+		.end	= AXP20X_IRQ_PEK_FAL_EDGE,
+		.flags	= IORESOURCE_IRQ,
+	},
+};

[...] 

+static struct mfd_cell axp20x_cells[] = {
+	{
+		.name		= "axp20x-pek",
+		.num_resources	= ARRAY_SIZE(axp20x_pek_resources),
+		.resources	= axp20x_pek_resources,
+	}, {
+		.name		= "axp20x-regulator",
+	},
+};

nit: The format of these two structs are inconsistent.

[...]

+static int axp20x_i2c_probe(struct i2c_client *i2c,
+			 const struct i2c_device_id *id)
+{
+	struct axp20x_dev *axp20x;
+	const struct of_device_id *of_id;
+	int ret;
+
+	axp20x = devm_kzalloc(&i2c->dev, sizeof(*axp20x), GFP_KERNEL);
+	if (!axp20x)
+		return -ENOMEM;
+
+	of_id = of_match_device(axp20x_of_match, &i2c->dev);
+	if (!of_id) {
+		dev_err(&i2c->dev, "Unable to setup AXP20X data\n");
+		return -ENODEV;
+	}
+	axp20x->variant = (int) of_id->data;

No need to cast from void *.

+	axp20x->i2c_client = i2c;
+	axp20x->dev = &i2c->dev;
+	dev_set_drvdata(axp20x->dev, axp20x);
+
+	axp20x->regmap = devm_regmap_init_i2c(i2c, &axp20x_regmap_config);
+	if (IS_ERR(axp20x->regmap)) {
+		ret = PTR_ERR(axp20x->regmap);
+		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
+		return ret;
+	}
+
+	axp20x->irq = i2c->irq;

Do you _really_ need this if you have 'axp20x->i2c_client->irq'?

+	ret = regmap_add_irq_chip(axp20x->regmap, axp20x->irq,
+				  IRQF_ONESHOT | IRQF_SHARED, -1,
+				  &axp20x_regmap_irq_chip,
+				  &axp20x->regmap_irqc);
+	if (ret) {
+		dev_err(&i2c->dev, "failed to add irq chip: %d\n", ret);
+		return ret;
+	}
+
+	ret = mfd_add_devices(axp20x->dev, -1, axp20x_cells,
+			      ARRAY_SIZE(axp20x_cells), NULL, 0, NULL);
+
+	if (ret) {
+		dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
+		goto mfd_err;
+	}
+
+	if (!pm_power_off) {
+		axp20x_pm_power_off = axp20x;
+		pm_power_off = axp20x_power_off;
+	}
+
+	dev_info(&i2c->dev, "AXP20X driver loaded\n");
+
+	return 0;
+
+mfd_err:
+	regmap_del_irq_chip(axp20x->irq, axp20x->regmap_irqc);
+
+	return ret;

I'd say the goto is pointless if you're only using it once.

Instead move regmap_del_irq_chip() into mfd_add_devices()'s error
handler and return straight from there.

[...]

+static const struct i2c_device_id axp20x_i2c_id[] = {
+	{ "axp202", AXP202_ID },
+	{ "axp209", AXP209_ID },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, axp20x_i2c_id);

Isn't this redundant now that you're using of_id?

[...]

+#ifndef __LINUX_MFD_AXP20X_H
+#define __LINUX_MFD_AXP20X_H
+
+#define AXP202_ID			0
+#define AXP209_ID			1

enum?

[...] 

+struct axp20x_dev {
+	struct device			*dev;
+	struct i2c_client		*i2c_client;
+	struct regmap			*regmap;
+	struct regmap_irq_chip_data	*regmap_irqc;
+	int				variant;
+	int				irq;

i2c_client->irq?

+};
+
+#endif /* __LINUX_MFD_AXP20X_H */

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

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