linux-kernel - Re: [PATCH 1/2] mfd: retu: Add OF device ID table

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Message-ID: <20170315103458.tah47dctp4fizr7x@dell>
Date:   Wed, 15 Mar 2017 10:34:58 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Javier Martinez Canillas <javier@....samsung.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mfd: retu: Add OF device ID table

On Tue, 21 Feb 2017, Javier Martinez Canillas wrote:

> The driver doesn't have a struct of_device_id table but supported devices
> are registered via Device Trees. This is working on the assumption that a
> I2C device registered via OF will always match a legacy I2C device ID and
> that the MODALIAS reported will always be of the form i2c:<device>.
> 
> But this could change in the future so the correct approach is to have a
> OF device ID table if the devices are registered via OF.
> 
> The compatible strings don't have a vendor prefix because that's how it's
> used currently, and changing this will be a Device Tree ABI break.
> 
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> ---
> 
>  drivers/mfd/retu-mfd.c | 8 ++++++++
>  1 file changed, 8 insertions(+)

You're going to need a DT Ack for this.

... which might be difficult, since you didn't Cc them.

> diff --git a/drivers/mfd/retu-mfd.c b/drivers/mfd/retu-mfd.c
> index d4c114abeb75..b47ba6a63b7e 100644
> --- a/drivers/mfd/retu-mfd.c
> +++ b/drivers/mfd/retu-mfd.c
> @@ -308,9 +308,17 @@ static const struct i2c_device_id retu_id[] = {
>  };
>  MODULE_DEVICE_TABLE(i2c, retu_id);
>  
> +static const struct of_device_id retu_of_match[] = {
> +	{ .compatible = "retu-mfd" },
> +	{ .compatible = "tahvo-mfd" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, retu_of_match);
> +
>  static struct i2c_driver retu_driver = {
>  	.driver		= {
>  		.name = "retu-mfd",
> +		.of_match_table = of_match_ptr(retu_of_match),
>  	},
>  	.probe		= retu_probe,
>  	.remove		= retu_remove,

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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