Re: [PATCH 1/2] mfd: bd96801: Add ERRB IRQ

[Lee Jones <lee@kernel.org>]

On Mon, 26 Aug 2024, Matti Vaittinen wrote:

> The ROHM BD96801 "scalable PMIC" provides two physical IRQs. The ERRB
> handling can in many cases be omitted because it is used to inform fatal
> IRQs, which usually kill the power from the SOC.
> 
> There may however be use-cases where the SOC has a 'back-up' emergency
> power source which allows some very short time of operation to try to
> gracefully shut down sensitive hardware. Furthermore, it is possible the
> processor controlling the PMIC is not powered by the PMIC. In such cases
> handling the ERRB IRQs may be beneficial.
> 
> Add support for ERRB IRQs.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
> ---
> Revision history:
> New series (only ERRB addition)
> v1:
> 	- use devm allocation for regulator_res
> 	- use goto skip_errb instead of an if (errb)
> 	- constify immutable structs
> 
> Old series (All BD96801 functionality + irqdomain and regmap changes)
> v2 => v3:
> 	- No changes
> v1 => v2:
> 	- New patch
> 
> mfd: constify structs
> ---
>  drivers/mfd/rohm-bd96801.c | 276 ++++++++++++++++++++++++++++++++-----
>  1 file changed, 241 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/mfd/rohm-bd96801.c b/drivers/mfd/rohm-bd96801.c
> index 714f08ed544b..fff764ddbf2f 100644
> --- a/drivers/mfd/rohm-bd96801.c
> +++ b/drivers/mfd/rohm-bd96801.c
> @@ -5,13 +5,9 @@
>   * ROHM BD96801 PMIC driver
>   *
>   * This version of the "BD86801 scalable PMIC"'s driver supports only very
> - * basic set of the PMIC features. Most notably, there is no support for
> - * the ERRB interrupt and the configurations which should be done when the
> - * PMIC is in STBY mode.
> - *
> - * Supporting the ERRB interrupt would require dropping the regmap-IRQ
> - * usage or working around (or accepting a presense of) a naming conflict
> - * in debugFS IRQs.
> + * basic set of the PMIC features.
> + * Most notably, there is no support for the configurations which should
> + * be done when the PMIC is in STBY mode.
>   *
>   * Being able to reliably do the configurations like changing the
>   * regulator safety limits (like limits for the over/under -voltages, over
> @@ -23,16 +19,14 @@
>   * be the need to configure these safety limits. Hence it's not simple to
>   * come up with a generic solution.
>   *
> - * Users who require the ERRB handling and STBY state configurations can
> - * have a look at the original RFC:
> + * Users who require the STBY state configurations can  have a look at the
> + * original RFC:
>   * https://lore.kernel.org/all/cover.1712920132.git.mazziesaccount@gmail.com/
> - * which implements a workaround to debugFS naming conflict and some of
> - * the safety limit configurations - but leaves the state change handling
> - * and synchronization to be implemented.
> + * which implements some of the safety limit configurations - but leaves the
> + * state change handling and synchronization to be implemented.
>   *
>   * It would be great to hear (and receive a patch!) if you implement the
> - * STBY configuration support or a proper fix to the debugFS naming
> - * conflict in your downstream driver ;)
> + * STBY configuration support or a proper fix in your downstream driver ;)
>   */
>  
>  #include <linux/i2c.h>
> @@ -46,6 +40,64 @@
>  #include <linux/mfd/rohm-bd96801.h>
>  #include <linux/mfd/rohm-generic.h>
>  
> +static const struct resource regulator_errb_irqs[] = {
> +	DEFINE_RES_IRQ_NAMED(BD96801_OTP_ERR_STAT, "bd96801-otp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_DBIST_ERR_STAT, "bd96801-dbist-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_EEP_ERR_STAT, "bd96801-eep-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_ABIST_ERR_STAT, "bd96801-abist-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_PRSTB_ERR_STAT, "bd96801-prstb-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_DRMOS1_ERR_STAT, "bd96801-drmoserr1"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_DRMOS2_ERR_STAT, "bd96801-drmoserr2"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_SLAVE_ERR_STAT, "bd96801-slave-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_VREF_ERR_STAT, "bd96801-vref-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_TSD_ERR_STAT, "bd96801-tsd"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_UVLO_ERR_STAT, "bd96801-uvlo-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_OVLO_ERR_STAT, "bd96801-ovlo-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_OSC_ERR_STAT, "bd96801-osc-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_PON_ERR_STAT, "bd96801-pon-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_POFF_ERR_STAT, "bd96801-poff-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_CMD_SHDN_ERR_STAT, "bd96801-cmd-shdn-err"),
> +
> +	DEFINE_RES_IRQ_NAMED(BD96801_INT_PRSTB_WDT_ERR, "bd96801-prstb-wdt-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_INT_CHIP_IF_ERR, "bd96801-chip-if-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_INT_SHDN_ERR_STAT, "bd96801-int-shdn-err"),
> +
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK1_PVIN_ERR_STAT, "bd96801-buck1-pvin-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK1_OVP_ERR_STAT, "bd96801-buck1-ovp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK1_UVP_ERR_STAT, "bd96801-buck1-uvp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK1_SHDN_ERR_STAT, "bd96801-buck1-shdn-err"),
> +
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK2_PVIN_ERR_STAT, "bd96801-buck2-pvin-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK2_OVP_ERR_STAT, "bd96801-buck2-ovp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK2_UVP_ERR_STAT, "bd96801-buck2-uvp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK2_SHDN_ERR_STAT, "bd96801-buck2-shdn-err"),
> +
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK3_PVIN_ERR_STAT, "bd96801-buck3-pvin-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK3_OVP_ERR_STAT, "bd96801-buck3-ovp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK3_UVP_ERR_STAT, "bd96801-buck3-uvp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK3_SHDN_ERR_STAT, "bd96801-buck3-shdn-err"),
> +
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK4_PVIN_ERR_STAT, "bd96801-buck4-pvin-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK4_OVP_ERR_STAT, "bd96801-buck4-ovp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK4_UVP_ERR_STAT, "bd96801-buck4-uvp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_BUCK4_SHDN_ERR_STAT, "bd96801-buck4-shdn-err"),
> +
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO5_PVIN_ERR_STAT, "bd96801-ldo5-pvin-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO5_OVP_ERR_STAT, "bd96801-ldo5-ovp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO5_UVP_ERR_STAT, "bd96801-ldo5-uvp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO5_SHDN_ERR_STAT, "bd96801-ldo5-shdn-err"),
> +
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO6_PVIN_ERR_STAT, "bd96801-ldo6-pvin-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO6_OVP_ERR_STAT, "bd96801-ldo6-ovp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO6_UVP_ERR_STAT, "bd96801-ldo6-uvp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO6_SHDN_ERR_STAT, "bd96801-ldo6-shdn-err"),
> +
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO7_PVIN_ERR_STAT, "bd96801-ldo7-pvin-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO7_OVP_ERR_STAT, "bd96801-ldo7-ovp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO7_UVP_ERR_STAT, "bd96801-ldo7-uvp-err"),
> +	DEFINE_RES_IRQ_NAMED(BD96801_LDO7_SHDN_ERR_STAT, "bd96801-ldo7-shdn-err"),
> +};
> +
>  static const struct resource regulator_intb_irqs[] = {
>  	DEFINE_RES_IRQ_NAMED(BD96801_TW_STAT, "bd96801-core-thermal"),
>  
> @@ -90,20 +142,14 @@ static const struct resource regulator_intb_irqs[] = {
>  	DEFINE_RES_IRQ_NAMED(BD96801_LDO7_UVD_STAT, "bd96801-ldo7-undervolt"),
>  };
>  
> -static const struct resource wdg_intb_irqs[] = {
> -	DEFINE_RES_IRQ_NAMED(BD96801_WDT_ERR_STAT, "bd96801-wdg"),
> +enum {
> +	WDG_CELL = 0,
> +	REGULATOR_CELL,
>  };
>  
>  static struct mfd_cell bd96801_cells[] = {
> -	{
> -		.name = "bd96801-wdt",
> -		.resources = wdg_intb_irqs,
> -		.num_resources = ARRAY_SIZE(wdg_intb_irqs),
> -	}, {
> -		.name = "bd96801-regulator",
> -		.resources = regulator_intb_irqs,
> -		.num_resources = ARRAY_SIZE(regulator_intb_irqs),
> -	},
> +	[WDG_CELL] = { .name = "bd96801-wdt", },
> +	[REGULATOR_CELL] = { .name = "bd96801-regulator", },
>  };
>  
>  static const struct regmap_range bd96801_volatile_ranges[] = {
> @@ -128,6 +174,91 @@ static const struct regmap_access_table volatile_regs = {
>  	.n_yes_ranges = ARRAY_SIZE(bd96801_volatile_ranges),
>  };
>  
> +/*
> + * For ERRB we need main register bit mapping as bit(0) indicates active IRQ
> + * in one of the first 3 sub IRQ registers, For INTB we can use default 1 to 1
> + * mapping.
> + */
> +static unsigned int bit0_offsets[] = {0, 1, 2};	/* System stat, 3 registers */
> +static unsigned int bit1_offsets[] = {3};	/* Buck 1 stat */
> +static unsigned int bit2_offsets[] = {4};	/* Buck 2 stat */
> +static unsigned int bit3_offsets[] = {5};	/* Buck 3 stat */
> +static unsigned int bit4_offsets[] = {6};	/* Buck 4 stat */
> +static unsigned int bit5_offsets[] = {7};	/* LDO 5 stat */
> +static unsigned int bit6_offsets[] = {8};	/* LDO 6 stat */
> +static unsigned int bit7_offsets[] = {9};	/* LDO 7 stat */
> +
> +static const struct regmap_irq_sub_irq_map errb_sub_irq_offsets[] = {
> +	REGMAP_IRQ_MAIN_REG_OFFSET(bit0_offsets),
> +	REGMAP_IRQ_MAIN_REG_OFFSET(bit1_offsets),
> +	REGMAP_IRQ_MAIN_REG_OFFSET(bit2_offsets),
> +	REGMAP_IRQ_MAIN_REG_OFFSET(bit3_offsets),
> +	REGMAP_IRQ_MAIN_REG_OFFSET(bit4_offsets),
> +	REGMAP_IRQ_MAIN_REG_OFFSET(bit5_offsets),
> +	REGMAP_IRQ_MAIN_REG_OFFSET(bit6_offsets),
> +	REGMAP_IRQ_MAIN_REG_OFFSET(bit7_offsets),
> +};
> +
> +static const struct regmap_irq bd96801_errb_irqs[] = {
> +	/* Reg 0x52 Fatal ERRB1 */
> +	REGMAP_IRQ_REG(BD96801_OTP_ERR_STAT, 0, BD96801_OTP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_DBIST_ERR_STAT, 0, BD96801_DBIST_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_EEP_ERR_STAT, 0, BD96801_EEP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_ABIST_ERR_STAT, 0, BD96801_ABIST_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_PRSTB_ERR_STAT, 0, BD96801_PRSTB_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_DRMOS1_ERR_STAT, 0, BD96801_DRMOS1_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_DRMOS2_ERR_STAT, 0, BD96801_DRMOS2_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_SLAVE_ERR_STAT, 0, BD96801_SLAVE_ERR_MASK),
> +	/* 0x53 Fatal ERRB2 */
> +	REGMAP_IRQ_REG(BD96801_VREF_ERR_STAT, 1, BD96801_VREF_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_TSD_ERR_STAT, 1, BD96801_TSD_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_UVLO_ERR_STAT, 1, BD96801_UVLO_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_OVLO_ERR_STAT, 1, BD96801_OVLO_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_OSC_ERR_STAT, 1, BD96801_OSC_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_PON_ERR_STAT, 1, BD96801_PON_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_POFF_ERR_STAT, 1, BD96801_POFF_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_CMD_SHDN_ERR_STAT, 1, BD96801_CMD_SHDN_ERR_MASK),
> +	/* 0x54 Fatal INTB shadowed to ERRB */
> +	REGMAP_IRQ_REG(BD96801_INT_PRSTB_WDT_ERR, 2, BD96801_INT_PRSTB_WDT_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_INT_CHIP_IF_ERR, 2, BD96801_INT_CHIP_IF_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_INT_SHDN_ERR_STAT, 2, BD96801_INT_SHDN_ERR_MASK),
> +	/* Reg 0x55 BUCK1 ERR IRQs */
> +	REGMAP_IRQ_REG(BD96801_BUCK1_PVIN_ERR_STAT, 3, BD96801_OUT_PVIN_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK1_OVP_ERR_STAT, 3, BD96801_OUT_OVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK1_UVP_ERR_STAT, 3, BD96801_OUT_UVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK1_SHDN_ERR_STAT, 3, BD96801_OUT_SHDN_ERR_MASK),
> +	/* Reg 0x56 BUCK2 ERR IRQs */
> +	REGMAP_IRQ_REG(BD96801_BUCK2_PVIN_ERR_STAT, 4, BD96801_OUT_PVIN_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK2_OVP_ERR_STAT, 4, BD96801_OUT_OVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK2_UVP_ERR_STAT, 4, BD96801_OUT_UVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK2_SHDN_ERR_STAT, 4, BD96801_OUT_SHDN_ERR_MASK),
> +	/* Reg 0x57 BUCK3 ERR IRQs */
> +	REGMAP_IRQ_REG(BD96801_BUCK3_PVIN_ERR_STAT, 5, BD96801_OUT_PVIN_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK3_OVP_ERR_STAT, 5, BD96801_OUT_OVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK3_UVP_ERR_STAT, 5, BD96801_OUT_UVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK3_SHDN_ERR_STAT, 5, BD96801_OUT_SHDN_ERR_MASK),
> +	/* Reg 0x58 BUCK4 ERR IRQs */
> +	REGMAP_IRQ_REG(BD96801_BUCK4_PVIN_ERR_STAT, 6, BD96801_OUT_PVIN_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK4_OVP_ERR_STAT, 6, BD96801_OUT_OVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK4_UVP_ERR_STAT, 6, BD96801_OUT_UVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_BUCK4_SHDN_ERR_STAT, 6, BD96801_OUT_SHDN_ERR_MASK),
> +	/* Reg 0x59 LDO5 ERR IRQs */
> +	REGMAP_IRQ_REG(BD96801_LDO5_PVIN_ERR_STAT, 7, BD96801_OUT_PVIN_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_LDO5_OVP_ERR_STAT, 7, BD96801_OUT_OVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_LDO5_UVP_ERR_STAT, 7, BD96801_OUT_UVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_LDO5_SHDN_ERR_STAT, 7, BD96801_OUT_SHDN_ERR_MASK),
> +	/* Reg 0x5a LDO6 ERR IRQs */
> +	REGMAP_IRQ_REG(BD96801_LDO6_PVIN_ERR_STAT, 8, BD96801_OUT_PVIN_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_LDO6_OVP_ERR_STAT, 8, BD96801_OUT_OVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_LDO6_UVP_ERR_STAT, 8, BD96801_OUT_UVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_LDO6_SHDN_ERR_STAT, 8, BD96801_OUT_SHDN_ERR_MASK),
> +	/* Reg 0x5b LDO7 ERR IRQs */
> +	REGMAP_IRQ_REG(BD96801_LDO7_PVIN_ERR_STAT, 9, BD96801_OUT_PVIN_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_LDO7_OVP_ERR_STAT, 9, BD96801_OUT_OVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_LDO7_UVP_ERR_STAT, 9, BD96801_OUT_UVP_ERR_MASK),
> +	REGMAP_IRQ_REG(BD96801_LDO7_SHDN_ERR_STAT, 9, BD96801_OUT_SHDN_ERR_MASK),
> +};
> +
>  static const struct regmap_irq bd96801_intb_irqs[] = {
>  	/* STATUS SYSTEM INTB */
>  	REGMAP_IRQ_REG(BD96801_TW_STAT, 0, BD96801_TW_STAT_MASK),
> @@ -176,8 +307,25 @@ static const struct regmap_irq bd96801_intb_irqs[] = {
>  	REGMAP_IRQ_REG(BD96801_LDO7_UVD_STAT, 7, BD96801_LDO_UVD_STAT_MASK),
>  };
>  
> -static struct regmap_irq_chip bd96801_irq_chip_intb = {
> +static const struct regmap_irq_chip bd96801_irq_chip_errb = {
> +	.name = "bd96801-irq-errb",
> +	.domain_suffix = "errb",
> +	.main_status = BD96801_REG_INT_MAIN,
> +	.num_main_regs = 1,
> +	.irqs = &bd96801_errb_irqs[0],
> +	.num_irqs = ARRAY_SIZE(bd96801_errb_irqs),
> +	.status_base = BD96801_REG_INT_SYS_ERRB1,
> +	.mask_base = BD96801_REG_MASK_SYS_ERRB,
> +	.ack_base = BD96801_REG_INT_SYS_ERRB1,
> +	.init_ack_masked = true,
> +	.num_regs = 10,
> +	.irq_reg_stride = 1,
> +	.sub_reg_offsets = &errb_sub_irq_offsets[0],
> +};
> +
> +static const struct regmap_irq_chip bd96801_irq_chip_intb = {
>  	.name = "bd96801-irq-intb",
> +	.domain_suffix = "intb",
>  	.main_status = BD96801_REG_INT_MAIN,
>  	.num_main_regs = 1,
>  	.irqs = &bd96801_intb_irqs[0],
> @@ -199,11 +347,14 @@ static const struct regmap_config bd96801_regmap_config = {
>  
>  static int bd96801_i2c_probe(struct i2c_client *i2c)
>  {
> -	struct regmap_irq_chip_data *intb_irq_data;
> +	int i, ret, intb_irq, errb_irq, num_regu_irqs, num_intb, num_errb = 0;
> +	int wdg_irq_no;

Nit: Not sure why the smaller data elements have been placed at the top.

They were better down where they were.

> +	struct regmap_irq_chip_data *intb_irq_data, *errb_irq_data;
> +	struct irq_domain *intb_domain, *errb_domain;
> +	struct resource wdg_irq;
>  	const struct fwnode_handle *fwnode;
> -	struct irq_domain *intb_domain;
> +	struct resource *regulator_res;
>  	struct regmap *regmap;
> -	int ret, intb_irq;
>  
>  	fwnode = dev_fwnode(&i2c->dev);
>  	if (!fwnode)
> @@ -213,6 +364,23 @@ static int bd96801_i2c_probe(struct i2c_client *i2c)
>  	if (intb_irq < 0)
>  		return dev_err_probe(&i2c->dev, intb_irq, "INTB IRQ not configured\n");
>  
> +	num_intb =  ARRAY_SIZE(regulator_intb_irqs);
> +
> +	/* ERRB may be omitted if processor is powered by the PMIC */
> +	errb_irq = fwnode_irq_get_byname(fwnode, "errb");
> +	if (errb_irq < 0)
> +		errb_irq = 0;
> +
> +	if (errb_irq)
> +		num_errb = ARRAY_SIZE(regulator_errb_irqs);
> +
> +	num_regu_irqs = num_intb + num_errb;
> +
> +	regulator_res = devm_kcalloc(&i2c->dev, num_regu_irqs,
> +				     sizeof(*regulator_res), GFP_KERNEL);
> +	if (!regulator_res)
> +		return -ENOMEM;
> +
>  	regmap = devm_regmap_init_i2c(i2c, &bd96801_regmap_config);
>  	if (IS_ERR(regmap))
>  		return dev_err_probe(&i2c->dev, PTR_ERR(regmap),
> @@ -226,16 +394,54 @@ static int bd96801_i2c_probe(struct i2c_client *i2c)
>  				       IRQF_ONESHOT, 0, &bd96801_irq_chip_intb,
>  				       &intb_irq_data);
>  	if (ret)
> -		return dev_err_probe(&i2c->dev, ret, "Failed to add INTB IRQ chip\n");
> +		return dev_err_probe(&i2c->dev, ret, "Failed to add INTB irq_chip\n");
>  
>  	intb_domain = regmap_irq_get_domain(intb_irq_data);
>  
> -	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
> -				   bd96801_cells,
> -				   ARRAY_SIZE(bd96801_cells), NULL, 0,
> -				   intb_domain);
> +	/*
> +	 * MFD core code is built to handle only one IRQ domain. BD96801
> +	 * has two domains so we do IRQ mapping here and provide the
> +	 * already mapped IRQ numbers to sub-devices.
> +	 */

Do one or more of the subdevices consume both domains?

If not, why not call devm_mfd_add_devices() twice?

> +	for (i = 0; i < num_intb; i++) {
> +		struct resource *res = &regulator_res[i];
> +
> +		*res = regulator_intb_irqs[i];
> +		res->start = res->end = irq_create_mapping(intb_domain,
> +							    res->start);
> +	}
> +
> +	wdg_irq_no = irq_create_mapping(intb_domain, BD96801_WDT_ERR_STAT);
> +	wdg_irq = DEFINE_RES_IRQ_NAMED(wdg_irq_no, "bd96801-wdg");
> +	bd96801_cells[WDG_CELL].resources = &wdg_irq;
> +	bd96801_cells[WDG_CELL].num_resources = 1;
> +
> +	if (!num_errb)
> +		goto skip_errb;
> +
> +	ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, errb_irq, IRQF_ONESHOT,
> +				       0, &bd96801_irq_chip_errb, &errb_irq_data);
> +	if (ret)
> +		return dev_err_probe(&i2c->dev, ret,
> +				     "Failed to add ERRB (%d) irq_chip\n", errb_irq);
> +
> +	errb_domain = regmap_irq_get_domain(errb_irq_data);
> +
> +	for (i = 0; i < num_errb; i++) {
> +		struct resource *res = &regulator_res[num_intb + i];
> +
> +		*res = regulator_errb_irqs[i];
> +		res->start = res->end = irq_create_mapping(errb_domain, res->start);
> +	}
> +
> +skip_errb:
> +	bd96801_cells[REGULATOR_CELL].resources = regulator_res;
> +	bd96801_cells[REGULATOR_CELL].num_resources = num_regu_irqs;
> +
> +	ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, bd96801_cells,
> +				   ARRAY_SIZE(bd96801_cells), NULL, 0, NULL);
>  	if (ret)
> -		dev_err(&i2c->dev, "Failed to create subdevices\n");
> +		dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n");
>  
>  	return ret;
>  }
> -- 
> 2.45.2
> 
> 
> -- 
> Matti Vaittinen, Linux device drivers
> ROHM Semiconductors, Finland SWDC
> Kiviharjunlenkki 1E
> 90220 OULU
> FINLAND
> 
> ~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
> Simon says - in Latin please.
> ~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
> Thanks to Simon Glass for the translation =] 



-- 
Lee Jones [李琼斯]