linux-kernel - Re: [PATCH 18/18] mfd: wcd934x: Convert irq chip to config regs

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Date:   Sat, 12 Nov 2022 15:31:14 +0000
From:   Aidan MacDonald <aidanmacdonald.0x0@...il.com>
To:     lee@...nel.org
Cc:     mani@...nel.org, cristian.ciocaltea@...il.com, wens@...e.org,
        tharvey@...eworks.com, cw00.choi@...sung.com,
        krzysztof.kozlowski@...aro.org, brgl@...ev.pl,
        mazziesaccount@...il.com, orsonzhai@...il.com,
        baolin.wang@...ux.alibaba.com, zhang.lyra@...il.com,
        jernej.skrabec@...il.com, samuel@...lland.org,
        linux-kernel@...r.kernel.org, linux-actions@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 18/18] mfd: wcd934x: Convert irq chip to config regs


> Type registers are deprecated and will eventually be removed from
> regmap-irq. The same functionality can be replicated with config
> registers.
>
> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
> ---
>  drivers/mfd/wcd934x.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)

Forgot to include this here:--

One issue with WCD934x - after applying the patch, a bug in regmap-irq
will cause a null pointer deref when setting the IRQ type, but a fix is
already in the regmap tree.

Link: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git/commit/?id=84498d1fb35de6ab71bdfdb6270a464fb4a0951b

> diff --git a/drivers/mfd/wcd934x.c b/drivers/mfd/wcd934x.c
> index 68e2fa2fda99..07e884087f2c 100644
> --- a/drivers/mfd/wcd934x.c
> +++ b/drivers/mfd/wcd934x.c
> @@ -55,17 +55,22 @@ static const struct regmap_irq wcd934x_irqs[] = {
>  	WCD934X_REGMAP_IRQ_REG(WCD934X_IRQ_SOUNDWIRE, 2, BIT(4)),
>  };
>
> +static const unsigned int wcd934x_config_regs[] = {
> +	WCD934X_INTR_LEVEL0,
> +};
> +
>  static const struct regmap_irq_chip wcd934x_regmap_irq_chip = {
>  	.name = "wcd934x_irq",
>  	.status_base = WCD934X_INTR_PIN1_STATUS0,
>  	.mask_base = WCD934X_INTR_PIN1_MASK0,
>  	.ack_base = WCD934X_INTR_PIN1_CLEAR0,
> -	.type_base = WCD934X_INTR_LEVEL0,
> -	.num_type_reg = 4,
> -	.type_in_mask = false,
>  	.num_regs = 4,
>  	.irqs = wcd934x_irqs,
>  	.num_irqs = ARRAY_SIZE(wcd934x_irqs),
> +	.config_base = wcd934x_config_regs,
> +	.num_config_bases = ARRAY_SIZE(wcd934x_config_regs),
> +	.num_config_regs = 4,
> +	.set_type_config = regmap_irq_set_type_config_simple,
>  };
>
>  static bool wcd934x_is_volatile_register(struct device *dev, unsigned int reg)