[PATCH v6 17/23] mfd: max77686: Add Maxim 77802 PMIC support

Krzysztof Kozlowski
2014-07-04T11:30:34Z

On pi?, 2014-07-04 at 11:55 +0200, Javier Martinez Canillas wrote:
> Maxim MAX77802 is a power management chip that contains 10 high
> efficiency Buck regulators, 32 Low-dropout (LDO) regulators used
> to power up application processors and peripherals, a 2-channel
> 32kHz clock outputs, a Real-Time-Clock (RTC) and a I2C interface
> to program the individual regulators, clocks outputs and the RTC.
>
> This patch adds support for MAX77802 to the MAX77686 driver and is
> based on a driver added to the Chrome OS kernel 3.8 by Simon Glass.
>
> Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
> ---
>
> NOTE: I didn't carry previous {Review,Acked,Tested}-by tags since
> this patch extending MAX77686 is quite different than the old one
> adding a new mfd driver. So review and test is highly appreciated.
>
> Changes since v5:
> - Extend the 77686 driver to support 77802 instead of adding a new driver.
> Suggested by Lee Jones.
>
> Changes since v4:
> - Use consistent expressions when checking for NULL values.
> Suggested by Krzysztof Kozlowski.
> - Remove unused defines. Suggested by Krzysztof Kozlowski.
> - Explain why IRQ is disabled on suspend. Suggested by Krzysztof Kozlowski.
>
> Changes since v3:
> - Remove unnecessary OOM error message since the mm subsystem already logs it.
>
> Changes since v2:
> - Split the DT binding docs in a separate patch and improve the documentation.
> Suggested by Mark Brown.
> - Add all the devices in the MFD driver instead of doing in separate patches.
> Suggested by Mark Brown.
>
> Changes since v1:
> - Convert max77{686,802} to regmap irq API and get rid of max77{686,802}-irq.c
> Suggested by Krzysztof Kozlowski.
> - Don't protect max77802 mfd_cells using Kconfig options since mfd core omits
> devices that don't match. Suggested by Lee Jones.
> - Change mfd driver to be tristate instead of boolean. Suggested by Mark Brown.
> - Change binding "voltage-regulators" property to "regulators" to be consistent
> with other PMIC drivers. Suggested by Mark Brown.
> - Use regulators node names instead of the deprecated "regulator-compatible"
> property. Suggested by Mark Brown.
> - Use the new descriptor-based GPIO interface instead of the deprecated
> ---
> drivers/mfd/Kconfig | 6 +-
> drivers/mfd/max77686.c | 187 ++++++++++++++++++++++++++-----
> include/linux/mfd/max77686-private.h | 208 ++++++++++++++++++++++++++++++++++-
> include/linux/mfd/max77686.h | 60 +++++++++-
> 4 files changed, 428 insertions(+), 33 deletions(-)
>

Three comments below, after fixing:
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

(...)

> @@ -55,6 +123,17 @@ static struct regmap_config max77686_rtc_regmap_config = {
> .val_bits = 8,
> };
>
> +static struct regmap_config max77802_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .writeable_reg = max77802_is_accessible_reg,
> + .readable_reg = max77802_is_accessible_reg,
> + .precious_reg = max77802_is_precious_reg,
> + .volatile_reg = max77802_is_volatile_reg,
> + .name = "max77802-pmic",
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> static const struct regmap_irq max77686_irqs[] = {
> /* INT1 interrupts */
> { .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, },
> @@ -98,9 +177,34 @@ static const struct regmap_irq_chip max77686_rtc_irq_chip = {
> .num_irqs = ARRAY_SIZE(max77686_rtc_irqs),
> };
>
> +static const struct regmap_irq_chip max77802_irq_chip = {
> + .name = "max77802-pmic",
> + .status_base = MAX77802_REG_INT1,
> + .mask_base = MAX77802_REG_INT1MSK,
> + .num_regs = 2,
> + .irqs = max77686_irqs, /* same masks than 77686 */

"same masks as 77686"

> + .num_irqs = ARRAY_SIZE(max77686_irqs),
> +};
> +
> +static const struct regmap_irq_chip max77802_rtc_irq_chip = {
> + .name = "max77802-rtc",
> + .status_base = MAX77802_RTC_INT,
> + .mask_base = MAX77802_RTC_INTM,
> + .num_regs = 1,
> + .irqs = max77686_rtc_irqs, /* same masks than 77686 */

Ditto

> + .num_irqs = ARRAY_SIZE(max77686_rtc_irqs),
> +};
> +
> static const struct of_device_id max77686_pmic_dt_match[] = {
> - {.compatible = "maxim,max77686", .data = NULL},
> - {},
> + {
> + .compatible = "maxim,max77686",
> + .data = (void *)TYPE_MAX77686,
> + },
> + {
> + .compatible = "maxim,max77802",
> + .data = (void *)TYPE_MAX77802,
> + },
> + { },
> };
>
> static void max77686_dt_parse_dvs_gpio(struct device *dev)
> @@ -236,6 +340,12 @@ static int max77686_i2c_probe(struct i2c_client *i2c,
> struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev);
> unsigned int data;
> int ret = 0;
> + const struct regmap_config *config;
> + const struct regmap_irq_chip *irq_chip;
> + const struct regmap_irq_chip *rtc_irq_chip;
> + struct regmap **rtc_regmap;
> + const struct mfd_cell *cells;
> + int n_devs;
>
> if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node && !pdata)
> pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
> @@ -258,56 +368,77 @@ static int max77686_i2c_probe(struct i2c_client *i2c,
> max77686->wakeup = pdata->wakeup;
> max77686->irq = i2c->irq;
>
> - max77686->regmap = devm_regmap_init_i2c(i2c, &max77686_regmap_config);
> + if (max77686->type == TYPE_MAX77686) {
> + config = &max77686_regmap_config;
> + irq_chip = &max77686_irq_chip;
> + rtc_irq_chip = &max77686_rtc_irq_chip;
> + rtc_regmap = &max77686->rtc_regmap;
> + cells = max77686_devs;
> + n_devs = ARRAY_SIZE(max77686_devs);
> + } else {
> + config = &max77802_regmap_config;
> + irq_chip = &max77802_irq_chip;
> + rtc_irq_chip = &max77802_rtc_irq_chip;
> + rtc_regmap = &max77686->regmap;
> + cells = max77802_devs;
> + n_devs = ARRAY_SIZE(max77802_devs);
> + }
> +
> + max77686->regmap = devm_regmap_init_i2c(i2c, config);
> if (IS_ERR(max77686->regmap)) {
> ret = PTR_ERR(max77686->regmap);
> dev_err(max77686->dev, "Failed to allocate register map: %d\n",
> - ret);
> + ret);
> return ret;
> }
>
> ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data);
> if (ret < 0) {
> dev_err(max77686->dev,
> - "device not found on this channel (this is not an error)\n");
> - return -ENODEV;
> - }
> -
> - max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
> - if (!max77686->rtc) {
> - dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n");
> + "device not found on this channel\n");
> return -ENODEV;
> }
> - i2c_set_clientdata(max77686->rtc, max77686);
>
> - max77686->rtc_regmap = devm_regmap_init_i2c(max77686->rtc,
> - &max77686_rtc_regmap_config);
> - if (IS_ERR(max77686->rtc_regmap)) {
> - ret = PTR_ERR(max77686->rtc_regmap);
> - dev_err(max77686->dev, "failed to allocate RTC regmap: %d\n",
> - ret);
> - goto err_unregister_i2c;
> + if (max77686->type == TYPE_MAX77686) {
> + max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
> + if (!max77686->rtc) {
> + dev_err(max77686->dev,
> + "Failed to allocate I2C device for RTC\n");
> + return -ENODEV;
> + }
> + i2c_set_clientdata(max77686->rtc, max77686);
> +
> + max77686->rtc_regmap =
> + devm_regmap_init_i2c(max77686->rtc,
> + &max77686_rtc_regmap_config);
> + if (IS_ERR(max77686->rtc_regmap)) {
> + ret = PTR_ERR(max77686->rtc_regmap);
> + dev_err(max77686->dev,
> + "failed to allocate RTC regmap: %d\n",
> + ret);
> + goto err_unregister_i2c;
> + }
> }
>
> ret = regmap_add_irq_chip(max77686->regmap, max77686->irq,
> IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
> - IRQF_SHARED, 0, &max77686_irq_chip,
> + IRQF_SHARED, 0, irq_chip,
> &max77686->irq_data);
> if (ret) {
> dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret);
> goto err_unregister_i2c;
> }
> - ret = regmap_add_irq_chip(max77686->rtc_regmap, max77686->irq,
> +
> + ret = regmap_add_irq_chip(*rtc_regmap, max77686->irq,
> IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
> - IRQF_SHARED, 0, &max77686_rtc_irq_chip,
> + IRQF_SHARED, 0, rtc_irq_chip,
> &max77686->rtc_irq_data);
> if (ret) {
> dev_err(&i2c->dev, "failed to add RTC irq chip: %d\n", ret);
> goto err_del_irqc;
> }
>
> - ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
> - ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
> + ret = mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL, 0, NULL);
> if (ret < 0) {
> dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
> goto err_del_rtc_irqc;
> @@ -320,7 +451,8 @@ err_del_rtc_irqc:
> err_del_irqc:
> regmap_del_irq_chip(max77686->irq, max77686->irq_data);
> err_unregister_i2c:
> - i2c_unregister_device(max77686->rtc);
> + if (max77686->type == TYPE_MAX77686)
> + i2c_unregister_device(max77686->rtc);
>
> return ret;
> }
> @@ -341,6 +473,7 @@ static int max77686_i2c_remove(struct i2c_client *i2c)

In remove() you should unregister dummy RTC I2C device only on MAX77686
(77802 does not add it).

Best regards,
Krzysztof