Re: [PATCH v4 05/10] gpio: mxc: convert pad wakeup compatible checks to hwdata flags

[Frank Li]

On Wed, Oct 07, 2026 at 06:44:20PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@xxxxxxx>
>
> mxc_gpio_generic_config() and mxc_gpio_set_pad_wakeup() call
> of_device_is_compatible() on every invocation to determine pad wakeup
> capability and i.MX8QM-specific behavior.  These properties are
> invariant for the lifetime of the device.
>
> Extend the hwdata flags scheme introduced in the previous commit with
> MXC_GPIO_HAS_PAD_WAKEUP and MXC_GPIO_IS_IMX8QM, adding dedicated
> hwdata instances for imx8qm and imx8qxp (also used by imx8dxl).
> This replaces the repeated device tree string comparisons in the
> suspend/resume path with simple flag tests on static per-compatible
> data.
>
> While at it, clean up mxc_gpio_generic_config() to use a local ret
> variable for clarity instead of the == 0 comparison.
>
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> ---
>  drivers/gpio/gpio-mxc.c | 46 ++++++++++++++++++++++++++++++++++------------
>  1 file changed, 34 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
> index c08f0b59d284..5da603569d88 100644
> --- a/drivers/gpio/gpio-mxc.c
> +++ b/drivers/gpio/gpio-mxc.c
> @@ -34,6 +34,8 @@
>  #define IMX_SCU_WAKEUP_HIGH_LVL		7
>
>  #define MXC_GPIO_HAS_POWER_OFF		BIT(0)
> +#define MXC_GPIO_HAS_PAD_WAKEUP		BIT(1)
> +#define MXC_GPIO_IS_IMX8QM		BIT(2)

Look like QM don't support fall edge

Can you use MXC_GPIO_FALL_EDGE_WAKEUP_BROKEN?

So it will be easy to know what feature missed for QM by hwdata.

Frank

>
>  /* device type dependent stuff */
>  struct mxc_gpio_hwdata {
> @@ -132,6 +134,26 @@ static struct mxc_gpio_hwdata imx7d_gpio_hwdata = {
>  	.flags = MXC_GPIO_HAS_POWER_OFF,
>  };
>
> +static struct mxc_gpio_hwdata imx8qm_gpio_hwdata = {
> +	MXC_GPIO_HW_DATA_COMMON,
> +	.flags = MXC_GPIO_IS_IMX8QM | MXC_GPIO_HAS_PAD_WAKEUP,
> +};
> +
> +static struct mxc_gpio_hwdata imx8qxp_gpio_hwdata = {
> +	MXC_GPIO_HW_DATA_COMMON,
> +	.flags = MXC_GPIO_HAS_PAD_WAKEUP,
> +};
> +
> +static inline bool mxc_gpio_is_imx8qm(struct mxc_gpio_port *port)
> +{
> +	return port->hwdata->flags & MXC_GPIO_IS_IMX8QM;
> +}
> +
> +static inline bool mxc_gpio_has_pad_wakeup(struct mxc_gpio_port *port)
> +{
> +	return port->hwdata->flags & MXC_GPIO_HAS_PAD_WAKEUP;
> +}
> +
>  static inline bool mxc_gpio_has_power_off(struct mxc_gpio_port *port)
>  {
>  	return port->hwdata->flags & MXC_GPIO_HAS_POWER_OFF;
> @@ -158,9 +180,9 @@ static const struct of_device_id mxc_gpio_dt_ids[] = {
>  	{ .compatible = "fsl,imx31-gpio", .data = &imx31_gpio_hwdata },
>  	{ .compatible = "fsl,imx35-gpio", .data = &imx35_gpio_hwdata },
>  	{ .compatible = "fsl,imx7d-gpio", .data = &imx7d_gpio_hwdata },
> -	{ .compatible = "fsl,imx8dxl-gpio", .data = &imx35_gpio_hwdata },
> -	{ .compatible = "fsl,imx8qm-gpio", .data = &imx35_gpio_hwdata },
> -	{ .compatible = "fsl,imx8qxp-gpio", .data = &imx35_gpio_hwdata },
> +	{ .compatible = "fsl,imx8dxl-gpio", .data = &imx8qxp_gpio_hwdata },
> +	{ .compatible = "fsl,imx8qm-gpio", .data = &imx8qm_gpio_hwdata },
> +	{ .compatible = "fsl,imx8qxp-gpio", .data = &imx8qxp_gpio_hwdata },
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, mxc_gpio_dt_ids);
> @@ -575,15 +597,16 @@ static void mxc_gpio_restore_regs(struct mxc_gpio_port *port)
>  static bool mxc_gpio_generic_config(struct mxc_gpio_port *port,
>  		unsigned int offset, unsigned long conf)
>  {
> -	struct device_node *np = port->dev->of_node;
> +	int ret;
> +
> +	if (!mxc_gpio_has_pad_wakeup(port))
> +		return false;
>
> -	if (of_device_is_compatible(np, "fsl,imx8dxl-gpio") ||
> -	    of_device_is_compatible(np, "fsl,imx8qxp-gpio") ||
> -	    of_device_is_compatible(np, "fsl,imx8qm-gpio"))
> -		return (gpiochip_generic_config(&port->gen_gc.gc,
> -						offset, conf) == 0);
> +	ret = gpiochip_generic_config(&port->gen_gc.gc, offset, conf);
> +	if (ret)
> +		return false;
>
> -	return false;
> +	return true;
>  }
>
>  static bool mxc_gpio_set_pad_wakeup(struct mxc_gpio_port *port, bool enable)
> @@ -591,7 +614,6 @@ static bool mxc_gpio_set_pad_wakeup(struct mxc_gpio_port *port, bool enable)
>  	unsigned long config;
>  	bool ret = false;
>  	int i, type;
> -	bool is_imx8qm = of_device_is_compatible(port->dev->of_node, "fsl,imx8qm-gpio");
>
>  	static const u32 pad_type_map[] = {
>  		IMX_SCU_WAKEUP_OFF,		/* 0 */
> @@ -612,7 +634,7 @@ static bool mxc_gpio_set_pad_wakeup(struct mxc_gpio_port *port, bool enable)
>  		else
>  			config = IMX_SCU_WAKEUP_OFF;
>
> -		if (is_imx8qm && config == IMX_SCU_WAKEUP_FALL_EDGE) {
> +		if (mxc_gpio_is_imx8qm(port) && config == IMX_SCU_WAKEUP_FALL_EDGE) {
>  			dev_warn_once(port->dev,
>  				      "No falling-edge support for wakeup on i.MX8QM\n");
>  			config = IMX_SCU_WAKEUP_OFF;
>
> --
> 2.51.0
>
>