linux-kernel - Re: [PATCH 4/4] mfd: tqmx86: add I2C IRQ support

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Message-ID: <20240613154234.GJ2561462@google.com>
Date: Thu, 13 Jun 2024 16:42:34 +0100
From: Lee Jones <lee@...nel.org>
To: Matthias Schiffer <matthias.schiffer@...tq-group.com>
Cc: linux-kernel@...r.kernel.org,
	Gregor Herburger <gregor.herburger@...group.com>,
	linux@...tq-group.com
Subject: Re: [PATCH 4/4] mfd: tqmx86: add I2C IRQ support

On Wed, 05 Jun 2024, 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>
> ---
>  drivers/mfd/tqmx86.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/tqmx86.c b/drivers/mfd/tqmx86.c
> index cf27497245322..b96af7091b6bc 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
>  
> @@ -60,7 +61,12 @@ static uint gpio_irq;
>  module_param(gpio_irq, uint, 0);
>  MODULE_PARM_DESC(gpio_irq, "GPIO IRQ number (7, 9, 12)");
>  
> -static const struct resource tqmx_i2c_soft_resources[] = {
> +static uint i2c_irq;
> +module_param(i2c_irq, uint, 0);
> +MODULE_PARM_DESC(i2c_irq, "I2C IRQ number (7, 9, 12)");

Just one question; what is (7, 9, 12)?

And why is it the same as the GPIO one?  Copy/paste error?

> +static struct resource tqmx_i2c_soft_resources[] = {
> +	DEFINE_RES_IRQ(0),
>  	DEFINE_RES_IO(TQMX86_IOBASE_I2C, TQMX86_IOSIZE_I2C),
>  };
>  
> @@ -271,6 +277,18 @@ 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)
> +				i2c_irq = 0;
> +		}
> +
> +		if (i2c_irq)
> +			tqmx_i2c_soft_resources[0].start = i2c_irq;
> +		else
> +			tqmx_i2c_soft_resources[0].flags = 0;
> +
>  		err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
>  					   tqmx86_i2c_soft_dev,
>  					   ARRAY_SIZE(tqmx86_i2c_soft_dev),
> -- 
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> 

-- 
Lee Jones [李琼斯]