linux-kernel - Re: [PATCH 6/6] Input: mc13783-pwrbutton: add OF support

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Message-ID: <f9266133-9912-425c-bebb-98b076976583@kernel.org>
Date: Sun, 17 Aug 2025 13:24:39 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Alexander Kurz <akurz@...la.de>, Lee Jones <lee@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Dmitry Torokhov <dmitry.torokhov@...il.com>,
 Dzmitry Sankouski <dsankouski@...il.com>,
 "Dr. David Alan Gilbert" <linux@...blig.org>,
 Heiko Stuebner <heiko@...ech.de>,
 Uwe Kleine-König <u.kleine-koenig@...libre.com>,
 devicetree@...r.kernel.org, linux-input@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] Input: mc13783-pwrbutton: add OF support

On 17/08/2025 12:27, Alexander Kurz wrote:
> Add OF support for the mc13783-pwrbutton so that it can be used with
> modern DT based systems.
> 
> Signed-off-by: Alexander Kurz <akurz@...la.de>
> ---
>  drivers/input/misc/mc13783-pwrbutton.c | 78 +++++++++++++++++++++++++-
>  1 file changed, 75 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/input/misc/mc13783-pwrbutton.c b/drivers/input/misc/mc13783-pwrbutton.c
> index 49bc5d25f098..11a97ce070a5 100644
> --- a/drivers/input/misc/mc13783-pwrbutton.c
> +++ b/drivers/input/misc/mc13783-pwrbutton.c
> @@ -29,6 +29,7 @@
>  #include <linux/mfd/mc13783.h>
>  #include <linux/sched.h>
>  #include <linux/slab.h>
> +#include <linux/of.h>
>  
>  struct mc13783_pwrb {
>  	struct input_dev *pwr;
> @@ -105,8 +106,75 @@ static irqreturn_t button3_irq(int irq, void *_priv)
>  	return button_irq(MC13783_IRQ_ONOFD3, _priv);
>  }
>  
> +#ifdef CONFIG_OF
> +static inline struct mc13xxx_buttons_platform_data __init *mc13xxx_pwrbutton_probe_dt(
> +	struct platform_device *pdev)
> +{
> +	struct mc13xxx_buttons_platform_data *pdata;
> +	struct device_node *parent, *child;
> +	struct device *dev = &pdev->dev;
> +	enum mc13xxx_chip_type chip = platform_get_device_id(pdev)->driver_data;
> +	int ret = -ENODATA;
> +

No blank lines between declarations.

> +	/* ONOFD3 is only supported for MC13783. */
> +	int max_idx = chip != MC13XXX_CHIP_TYPE_MC13783 ? 2 : 1;

Ternary operator is hardly readable. Just store the number of buttons in
device match data


> +
> +	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +	if (!pdata)
> +		return ERR_PTR(-ENOMEM);
> +
> +	parent = of_get_child_by_name(dev->parent->of_node, "pwrbuttons");

Node name: buttons or keys instead

> +	if (!parent)
> +		goto out_node_put;
> +
> +	for_each_child_of_node(parent, child) {
> +		u32 idx;
> +		u8 dbnc = MC13783_BUTTON_DBNC_30MS;
> +
> +		if (of_property_read_u32(child, "reg", &idx))
> +			continue;
> +
> +		if (idx > max_idx) {
> +			dev_warn(dev, "reg out of range\n");
> +			continue;
> +		}
> +
> +		of_property_read_u8(child, "debounce-delay-value", &dbnc);
> +		if (dbnc > MC13783_BUTTON_DBNC_750MS) {
> +			dev_warn(dev, "debounce-delay-value out of range\n");
> +			continue;
> +		}
> +
> +		if (of_property_read_u32(child, "linux,code", &pdata->b_on_key[idx]))
> +			continue;
> +
> +		if (of_property_read_bool(child, "active-low"))
> +			pdata->b_on_flags[idx] |= MC13783_BUTTON_POL_INVERT;
> +
> +		if (of_property_read_bool(child, "enable-reset"))
> +			pdata->b_on_flags[idx] |= MC13783_BUTTON_RESET_EN;
> +
> +		pdata->b_on_flags[idx] |= MC13783_BUTTON_ENABLE | dbnc;
> +	}
> +
> +	ret = 0;
> +
> +out_node_put:
> +	of_node_put(parent);
> +
> +	return ret ? ERR_PTR(ret) : pdata;
> +}
> +#else
> +static inline struct mc13xxx_buttons_platform_data __init *mc13xxx_pwrbutton_probe_dt(


Section mismatch. Build your code with proper DEBUG options for section
mismatch check.

> +	struct platform_device *pdev)
> +{
> +	return ERR_PTR(-ENODEV);
> +}
> +#endif
Best regards,
Krzysztof