Re: [PATCH v4 1/3] mfd/axp20x: extend axp20x to support axp288 pmic

Jonathan Cameron
2014-09-21T13:01:21Z

On 17/09/14 01:11, Jacob Pan wrote:
> X-Powers AXP288 is a customized PMIC for Intel Baytrail-CR platforms. Similar
> to AXP202/209, AXP288 comes with USB charger, more LDO and BUCK channels, and
> AD converters. It also provides extended status and interrupt reporting
> capabilities than the devices currently supported in axp20x.c.
>
> In addition to feature extension, this patch also adds ACPI binding for
> enumeration.
>
> This consolidated driver should support more X-Powers' PMICs in both device
> tree and ACPI enumerated platforms.
>
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
One suggested improvement inline. When you a driver moves from supporting
one part to a couple with different configurations, a good pattern is
to pick between const configuration structures rather than having one
that is modified (or copied and then modified).

Jonathan
> ---
> drivers/mfd/Kconfig | 3 +-
> drivers/mfd/axp20x.c | 353 +++++++++++++++++++++++++++++++++++++--------
> include/linux/mfd/axp20x.h | 58 ++++++++
> 3 files changed, 354 insertions(+), 60 deletions(-)
>
...

> -static const struct regmap_irq_chip axp20x_regmap_irq_chip = {
> +static struct acpi_device_id axp20x_acpi_match[] = {
> + {
> + .id = "INT33F4",
> + .driver_data = (kernel_ulong_t)AXP288_ID,
> + },
> + { },
> +};
> +MODULE_DEVICE_TABLE(acpi, axp20x_acpi_match);
> +
> +/* common irq chip attributes only */
> +static struct regmap_irq_chip axp20x_regmap_irq_chip = {
> .name = "axp20x_irq_chip",
> .status_base = AXP20X_IRQ1_STATE,
> .ack_base = AXP20X_IRQ1_STATE,
> .mask_base = AXP20X_IRQ1_EN,
> - .num_regs = 5,
> - .irqs = axp20x_regmap_irqs,
> - .num_irqs = ARRAY_SIZE(axp20x_regmap_irqs),
> .mask_invert = true,
> .init_ack_masked = true,
> };
> @@ -161,36 +276,155 @@ static struct mfd_cell axp20x_cells[] = {
> },
> };
>
> +static struct resource axp288_adc_resources[] = {
> + {
> + .name = "GPADC",
> + .start = AXP288_IRQ_GPADC,
> + .end = AXP288_IRQ_GPADC,
> + .flags = IORESOURCE_IRQ,
> + },
> +};
> +
> +static struct resource axp288_charger_resources[] = {
> + {
> + .start = AXP288_IRQ_OV,
> + .end = AXP288_IRQ_OV,
> + .flags = IORESOURCE_IRQ,
> + },
> + {
> + .start = AXP288_IRQ_DONE,
> + .end = AXP288_IRQ_DONE,
> + .flags = IORESOURCE_IRQ,
> + },
> + {
> + .start = AXP288_IRQ_CHARGING,
> + .end = AXP288_IRQ_CHARGING,
> + .flags = IORESOURCE_IRQ,
> + },
> + {
> + .start = AXP288_IRQ_SAFE_QUIT,
> + .end = AXP288_IRQ_SAFE_QUIT,
> + .flags = IORESOURCE_IRQ,
> + },
> + {
> + .start = AXP288_IRQ_SAFE_ENTER,
> + .end = AXP288_IRQ_SAFE_ENTER,
> + .flags = IORESOURCE_IRQ,
> + },
> + {
> + .start = AXP288_IRQ_QCBTU,
> + .end = AXP288_IRQ_QCBTU,
> + .flags = IORESOURCE_IRQ,
> + },
> + {
> + .start = AXP288_IRQ_CBTU,
> + .end = AXP288_IRQ_CBTU,
> + .flags = IORESOURCE_IRQ,
> + },
> + {
> + .start = AXP288_IRQ_QCBTO,
> + .end = AXP288_IRQ_QCBTO,
> + .flags = IORESOURCE_IRQ,
> + },
> + {
> + .start = AXP288_IRQ_CBTO,
> + .end = AXP288_IRQ_CBTO,
> + .flags = IORESOURCE_IRQ,
> + },
> +};
> +
> +static struct mfd_cell axp288_cells[] = {
> + {
> + .name = "axp288_adc",
> + .num_resources = ARRAY_SIZE(axp288_adc_resources),
> + .resources = axp288_adc_resources,
> + },
> + {
> + .name = "axp288_charger",
> + .num_resources = ARRAY_SIZE(axp288_charger_resources),
> + .resources = axp288_charger_resources,
> + },
> + {
> + .name = "axp288_battery",
> + .num_resources = ARRAY_SIZE(axp288_battery_resources),
> + .resources = axp288_battery_resources,
> + },
> +};
> +
> static struct axp20x_dev *axp20x_pm_power_off;
> static void axp20x_power_off(void)
> {
> + if (axp20x_pm_power_off->variant == AXP288_ID)
> + return;
> regmap_write(axp20x_pm_power_off->regmap, AXP20X_OFF_CTRL,
> AXP20X_OFF);
> }
>
> +static int axp20x_match_device(struct axp20x_dev *axp20x, struct device *dev)
> +{
> + const struct acpi_device_id *acpi_id;
> + const struct of_device_id *of_id;
> +
> + of_id = of_match_device(axp20x_of_match, dev);
> + if (of_id)
> + axp20x->variant = (long) of_id->data;
> + else {
> + acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
> + if (!acpi_id || !acpi_id->driver_data) {
> + dev_err(dev, "Unable to determine ID\n");
> + return -ENODEV;
> + }
> + axp20x->variant = (long) acpi_id->driver_data;
> + }
> + switch (axp20x->variant) {
> + case AXP202_ID:
> + case AXP209_ID:
> + axp20x->nr_cells = ARRAY_SIZE(axp20x_cells);
> + axp20x->cells = axp20x_cells;
> + axp20x->regmap_cfg = &axp20x_regmap_config;
> + axp20x_regmap_irq_chip.num_regs = 5;
> + axp20x_regmap_irq_chip.irqs = axp20x_regmap_irqs;
> + axp20x_regmap_irq_chip.num_irqs =
> + ARRAY_SIZE(axp20x_regmap_irqs);
You would be better off having two regmap_irq_chip structures and
just picking the relevant one here. Then they can remain const.

> + break;
> + case AXP288_ID:
> + axp20x->cells = axp288_cells;
> + axp20x->nr_cells = ARRAY_SIZE(axp288_cells);
> + axp20x->regmap_cfg = &axp288_regmap_config;
> + axp20x_regmap_irq_chip.irqs = axp288_regmap_irqs;
> + axp20x_regmap_irq_chip.num_irqs =
> + ARRAY_SIZE(axp288_regmap_irqs);
> + axp20x_regmap_irq_chip.num_regs = 6;
> + break;
> + default:
> + dev_err(dev, "unsupported AXP20X ID %lu\n", axp20x->variant);
> + return -ENODEV;
> + }
> + dev_info(dev, "AXP20x variant %s found\n",
> + axp20x_model_names[axp20x->variant]);
> +
> + return 0;
> +}
> +
...