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SubjectRe: [PATCH v3 3/6] mfd: rn5t618: add irq support
On Fri, 29 Nov 2019, Andreas Kemnade wrote:

> This adds support for irq handling in the rc5t619 which is required

Please capitalise abbreviations and device names (as they do in the
datasheet).

> for properly implementing subdevices like rtc.

"RTC"

> For now only definitions for the variant rc5t619 are included.
>
> Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
> ---
> Changes in v3:
> alignment cleanup
>
> Changes in v2:
> - no dead code, did some more testing and thinking for that
> - remove extra empty lines
>
> drivers/mfd/Kconfig | 1 +
> drivers/mfd/Makefile | 2 +-
> drivers/mfd/rn5t618-core.c | 34 ++++++++++++++-
> drivers/mfd/rn5t618-irq.c | 85 +++++++++++++++++++++++++++++++++++++
> include/linux/mfd/rn5t618.h | 16 +++++++
> 5 files changed, 136 insertions(+), 2 deletions(-)
> create mode 100644 drivers/mfd/rn5t618-irq.c
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index ae24d3ea68ea..522e068d0082 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1057,6 +1057,7 @@ config MFD_RN5T618
> depends on OF
> select MFD_CORE
> select REGMAP_I2C
> + select REGMAP_IRQ
> help
> Say yes here to add support for the Ricoh RN5T567,
> RN5T618, RC5T619 PMIC.
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 110ea700231b..2906d5db67d0 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -217,7 +217,7 @@ obj-$(CONFIG_MFD_VIPERBOARD) += viperboard.o
> obj-$(CONFIG_MFD_RC5T583) += rc5t583.o rc5t583-irq.o
> obj-$(CONFIG_MFD_RK808) += rk808.o
>
> -rn5t618-objs := rn5t618-core.o
> +rn5t618-objs := rn5t618-core.o rn5t618-irq.o
> obj-$(CONFIG_MFD_RN5T618) += rn5t618.o
> obj-$(CONFIG_MFD_SEC_CORE) += sec-core.o sec-irq.o
> obj-$(CONFIG_MFD_SYSCON) += syscon.o
> diff --git a/drivers/mfd/rn5t618-core.c b/drivers/mfd/rn5t618-core.c
> index da5cd9c92a59..1e2326217681 100644
> --- a/drivers/mfd/rn5t618-core.c
> +++ b/drivers/mfd/rn5t618-core.c
> @@ -8,6 +8,7 @@
>
> #include <linux/delay.h>
> #include <linux/i2c.h>
> +#include <linux/interrupt.h>
> #include <linux/mfd/core.h>
> #include <linux/mfd/rn5t618.h>
> #include <linux/module.h>
> @@ -105,7 +106,8 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
>
> i2c_set_clientdata(i2c, priv);
> priv->variant = (long)of_id->data;
> -
> + priv->chip_irq = i2c->irq;
> + priv->dev = &i2c->dev;

'\n'

> priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
> if (IS_ERR(priv->regmap)) {
> ret = PTR_ERR(priv->regmap);
> @@ -137,6 +139,11 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
> return ret;
> }
>
> + if (priv->chip_irq > 0) {
> + if (rn5t618_irq_init(priv))
> + priv->chip_irq = 0;
> + }
> +
> return 0;
> }
>
> @@ -154,15 +161,40 @@ static int rn5t618_i2c_remove(struct i2c_client *i2c)
> return 0;
> }
>
> +static int __maybe_unused rn5t618_i2c_suspend(struct device *dev)
> +{
> + struct rn5t618 *priv = dev_get_drvdata(dev);
> +
> + if (priv->chip_irq)
> + disable_irq(priv->chip_irq);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused rn5t618_i2c_resume(struct device *dev)
> +{
> + struct rn5t618 *priv = dev_get_drvdata(dev);
> +
> + if (priv->chip_irq)
> + enable_irq(priv->chip_irq);
> +
> + return 0;
> +}
> +
> static const struct i2c_device_id rn5t618_i2c_id[] = {
> { }
> };
> MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);

Not this patch I know, but it's strange to see this empty.

> +static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops,
> + rn5t618_i2c_suspend,
> + rn5t618_i2c_resume);
> +
> static struct i2c_driver rn5t618_i2c_driver = {
> .driver = {
> .name = "rn5t618",
> .of_match_table = of_match_ptr(rn5t618_of_match),
> + .pm = &rn5t618_i2c_dev_pm_ops,
> },
> .probe = rn5t618_i2c_probe,
> .remove = rn5t618_i2c_remove,
> diff --git a/drivers/mfd/rn5t618-irq.c b/drivers/mfd/rn5t618-irq.c

Why does this need to be separate from the core file?

> new file mode 100644
> index 000000000000..8a4c56429768
> --- /dev/null
> +++ b/drivers/mfd/rn5t618-irq.c
> @@ -0,0 +1,85 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2019 Andreas Kemnade
> + */
> +#include <linux/device.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +
> +#include <linux/mfd/rn5t618.h>
> +
> +static const struct regmap_irq rc5t619_irqs[] = {
> + [RN5T618_IRQ_SYS] = {
> + .reg_offset = 0,
> + .mask = (0 << 1)
> + },
> + [RN5T618_IRQ_DCDC] = {
> + .reg_offset = 0,
> + .mask = (1 << 1)

BIT()

> + },
> + [RN5T618_IRQ_RTC] = {
> + .reg_offset = 0,
> + .mask = (1 << 2)
> + },
> + [RN5T618_IRQ_ADC] = {
> + .reg_offset = 0,
> + .mask = (1 << 3)
> + },
> + [RN5T618_IRQ_GPIO] = {
> + .reg_offset = 0,
> + .mask = (1 << 4)
> + },
> + [RN5T618_IRQ_CHG] = {
> + .reg_offset = 0,
> + .mask = (1 << 6),
> + }
> +};

There are probably macros available to tidy this up.

Take a look in include/linux/regmap.h

> +static const struct regmap_irq_chip rc5t619_irq_chip = {
> + .name = "rc5t619",
> + .irqs = rc5t619_irqs,
> + .num_irqs = ARRAY_SIZE(rc5t619_irqs),
> + .num_regs = 1,
> + .status_base = RN5T618_INTMON,
> + .mask_base = RN5T618_INTEN,
> + .mask_invert = true,
> +};
> +
> +int rn5t618_irq_init(struct rn5t618 *rn5t618)
> +{
> + const struct regmap_irq_chip *irq_chip;
> + int ret;
> +
> + if (!rn5t618->chip_irq)
> + return 0;
> +
> + switch (rn5t618->variant) {
> + case RC5T619:
> + irq_chip = &rc5t619_irq_chip;
> + break;
> +
> + /* TODO: check irq definitions for other variants */

No need for this. It's implied.

OOI, when support for more variants be added?

> + default:
> + irq_chip = NULL;
> + break;
> + }
> +
> + if (!irq_chip) {
> + dev_err(rn5t618->dev, "no IRQ definition known for variant\n");

How about '"Variant %d not currently supported", rn5t618->variant'

> + return -ENOENT;
> + }
> +
> + ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap,
> + rn5t618->chip_irq,
> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> + 0, irq_chip, &rn5t618->irq_data);
> + if (ret != 0) {

if (ret)

> + dev_err(rn5t618->dev, "Failed to register IRQ chip\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
> index d62ef48060b5..edd2b6485e3b 100644
> --- a/include/linux/mfd/rn5t618.h
> +++ b/include/linux/mfd/rn5t618.h
> @@ -242,9 +242,25 @@ enum {
> RC5T619,
> };
>
> +/* RN5T618 IRQ definitions */
> +enum {
> + RN5T618_IRQ_SYS,

= 0?

> + RN5T618_IRQ_DCDC,
> + RN5T618_IRQ_RTC,
> + RN5T618_IRQ_ADC,
> + RN5T618_IRQ_GPIO,
> + RN5T618_IRQ_CHG,
> + RN5T618_NR_IRQS,
> +};
> +
> struct rn5t618 {
> struct regmap *regmap;
> + struct device *dev;
> long variant;
> +
> + int chip_irq;

Are there any other kinds of IRQ?

If you don't have to differentiate between multiple, just 'irq' will
do.

This could also get confused with 'irq_chip'.

> + struct regmap_irq_chip_data *irq_data;
> };
>
> +extern int rn5t618_irq_init(struct rn5t618 *rn5t618);
> #endif /* __LINUX_MFD_RN5T618_H */

--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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