> 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 <ca...@caione.org>
> ---
> 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
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