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SubjectRE: [PATCH V3] mfd: da9062: add support for interrupt polarity defined in device tree
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On 06 February 2020 07:31, Shreyas Joshi wrote:

> The da9062 interrupt handler cannot necessarily be low active.
> Add a function to configure the interrupt type based on what is defined in the
> device tree. The allowable interrupt type is either low or high level trigger.
>
> Signed-off-by: Shreyas Joshi <shreyas.joshi@biamp.com>
> ---
> drivers/mfd/da9062-core.c | 38 +++++++++++++++++++++++++++++++++++---
> 1 file changed, 35 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mfd/da9062-core.c b/drivers/mfd/da9062-core.c
> index 419c73533401..c44a48ba3d05 100644
> --- a/drivers/mfd/da9062-core.c
> +++ b/drivers/mfd/da9062-core.c
> @@ -369,6 +369,32 @@ static int da9062_get_device_type(struct da9062 *chip)
> return ret;
> }
>
> +static u32 da9062_configure_irq_type(struct da9062 *chip, int irq, u32 *trigger)
> +{
> + u32 irq_type = 0;
> + struct irq_data *irq_data = irq_get_irq_data(irq);
> +
> + if (!irq_data) {
> + dev_err(chip->dev, "Invalid IRQ: %d\n", irq);
> + return -EINVAL;
> + }
> + *trigger = irqd_get_trigger_type(irq_data);
> +
> + switch (*trigger) {
> + case IRQ_TYPE_LEVEL_HIGH:
> + irq_type = 1;
> + break;
> + case IRQ_TYPE_LEVEL_LOW:
> + irq_type = 0;
> + break;
> + default:
> + dev_warn(chip->dev, "Unsupported IRQ type: %d\n", *trigger);
> + return -EIO;

Don't think EIO is the correct return code. Think EINVAL is more appropriate.

> + }

Indentation here for closing bracket isn't right. Make sure you run this through
the checkpatch.pl script.

> + return regmap_update_bits(chip->regmap, DA9062AA_CONFIG_A,
> + DA9062AA_IRQ_TYPE_MASK, irq_type);
> +}

This won't work. 'irq_type' needs to be shifted the correct number of bits.
See DA9062AA_IRQ_TYPE_SHIFT.

> +
> static const struct regmap_range da9061_aa_readable_ranges[] = {
> regmap_reg_range(DA9062AA_PAGE_CON, DA9062AA_STATUS_B),
> regmap_reg_range(DA9062AA_STATUS_D, DA9062AA_EVENT_C),
> @@ -417,6 +443,7 @@ static const struct regmap_range
> da9061_aa_writeable_ranges[] = {
> regmap_reg_range(DA9062AA_VBUCK1_A, DA9062AA_VBUCK4_A),
> regmap_reg_range(DA9062AA_VBUCK3_A, DA9062AA_VBUCK3_A),
> regmap_reg_range(DA9062AA_VLDO1_A, DA9062AA_VLDO4_A),
> + regmap_reg_range(DA9062AA_CONFIG_A, DA9062AA_CONFIG_B),
> regmap_reg_range(DA9062AA_VBUCK1_B, DA9062AA_VBUCK4_B),
> regmap_reg_range(DA9062AA_VBUCK3_B, DA9062AA_VBUCK3_B),
> regmap_reg_range(DA9062AA_VLDO1_B, DA9062AA_VLDO4_B),
> @@ -596,6 +623,7 @@ static int da9062_i2c_probe(struct i2c_client *i2c,
> const struct regmap_irq_chip *irq_chip;
> const struct regmap_config *config;
> int cell_num;
> + u32 trigger_type = 0;
> int ret;
>
> chip = devm_kzalloc(&i2c->dev, sizeof(*chip), GFP_KERNEL);
> @@ -654,10 +682,14 @@ static int da9062_i2c_probe(struct i2c_client *i2c,
> if (ret)
> return ret;
>
> + if (da9062_configure_irq_type(chip, i2c->irq, &trigger_type) < 0) {

You're returning error codes from 'da9062_configure_irq_type' so why are you
overriding what's returned with -EINVAL below?

> + dev_err(chip->dev, "Failed to configure IRQ type\n");
> + return -EINVAL;
> + }
> +
> ret = regmap_add_irq_chip(chip->regmap, i2c->irq,
> - IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
> - -1, irq_chip,
> - &chip->regmap_irq);
> + trigger_type | IRQF_SHARED | IRQF_ONESHOT,
> + -1, irq_chip, &chip->regmap_irq);
> if (ret) {
> dev_err(chip->dev, "Failed to request IRQ %d: %d\n",
> i2c->irq, ret);
> --
> 2.20.1

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