linux-kernel - Re: [PATCH v5 5/5] mfd: tqmx86: add I2C IRQ support

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Message-ID: <da174fe9af56d5c0f77ee140456c9d07cc968136.camel@ew.tq-group.com>
Date: Mon, 21 Oct 2024 16:44:26 +0200
From: Matthias Schiffer <matthias.schiffer@...tq-group.com>
To: Lee Jones <lee@...nel.org>
Cc: linux@...tq-group.com, linux-kernel@...r.kernel.org, Gregor Herburger
	 <gregor.herburger@...group.com>
Subject: Re: [PATCH v5 5/5] mfd: tqmx86: add I2C IRQ support

On Mon, 2024-10-21 at 13:34 +0200, Matthias Schiffer wrote:
> From: Gregor Herburger <gregor.herburger@...group.com>
> 
> The i2c-ocores controller can run in interrupt mode on tqmx86 modules.
> Add module parameter to allow configuring the IRQ number, similar to the
> handling of the GPIO IRQ.
> 
> Signed-off-by: Gregor Herburger <gregor.herburger@...group.com>
> Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> ---
> 
> v2: improve module parameter description (was patch 4/4)
> v3: replace IRQ 0 resource with an empty placeholder to simplify error handling
> v4: no changes
> v5: move placeholder to the end of the resource array, use define for index

Ugh... I just realized that I forgot to update a comment for v5. Will send a new version some time
this week.




> 
>  drivers/mfd/tqmx86.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/tqmx86.c b/drivers/mfd/tqmx86.c
> index 1fd2212bf492c..94126a484c412 100644
> --- a/drivers/mfd/tqmx86.c
> +++ b/drivers/mfd/tqmx86.c
> @@ -50,6 +50,7 @@
>  #define TQMX86_REG_IO_EXT_INT_9			2
>  #define TQMX86_REG_IO_EXT_INT_12		3
>  #define TQMX86_REG_IO_EXT_INT_MASK		0x3
> +#define TQMX86_REG_IO_EXT_INT_I2C_SHIFT		0
>  #define TQMX86_REG_IO_EXT_INT_GPIO_SHIFT	4
>  #define TQMX86_REG_SAUC		0x17
>  
> @@ -60,11 +61,18 @@ static uint gpio_irq;
>  module_param(gpio_irq, uint, 0);
>  MODULE_PARM_DESC(gpio_irq, "GPIO IRQ number (valid parameters: 7, 9, 12)");
>  
> +static uint i2c_irq;
> +module_param(i2c_irq, uint, 0);
> +MODULE_PARM_DESC(i2c_irq, "I2C IRQ number (valid parameters: 7, 9, 12)");
> +
>  /* Index of IRQ placeholder in resource list */
>  #define TQMX86_IRQ_GPIO 1
> +#define TQMX86_IRQ_I2C 1
>  
> -static const struct resource tqmx_i2c_soft_resources[] = {
> +static struct resource tqmx_i2c_soft_resources[] = {
>  	DEFINE_RES_IO(TQMX86_IOBASE_I2C, TQMX86_IOSIZE_I2C),
> +	/* Placeholder for IRQ resource - filled in by the probe function */
> +	[TQMX86_IRQ_I2C] = {},
>  };
>  
>  static const struct resource tqmx_watchdog_resources[] = {
> @@ -262,6 +270,14 @@ static int tqmx86_probe(struct platform_device *pdev)
>  	ocores_platform_data.clock_khz = tqmx86_board_id_to_clk_rate(dev, board_id);
>  
>  	if (i2c_det == TQMX86_REG_I2C_DETECT_SOFT) {
> +		if (i2c_irq) {
> +			err = tqmx86_setup_irq(dev, "I2C", i2c_irq, io_base,
> +					       TQMX86_REG_IO_EXT_INT_I2C_SHIFT);
> +			if (!err)
> +				/* Assumes the IRQ resource placeholder is first */
> +				tqmx_i2c_soft_resources[TQMX86_IRQ_I2C] = DEFINE_RES_IRQ(i2c_irq);
> +		}
> +
>  		err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
>  					   tqmx86_i2c_soft_dev,
>  					   ARRAY_SIZE(tqmx86_i2c_soft_dev),

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