linux-kernel - Re: [PATCH 03/14] fsi: Use of_match_table for bus matching if specified

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Date:   Thu, 17 Aug 2023 10:46:10 -0500
From:   Rob Herring <robh@...nel.org>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-fsi@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        jk@...abs.org, joel@....id.au, alistair@...ple.id.au,
        andrew@...id.au, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 03/14] fsi: Use of_match_table for bus matching if
 specified

On Mon, Jun 12, 2023 at 02:56:46PM -0500, Eddie James wrote:
> Since we have two scom drivers, use the standard of matching if
> the driver specifies a table so that the right devices go to the
> right driver.
> 
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>
> ---
>  drivers/fsi/fsi-core.c | 11 +++++++++--
>  drivers/fsi/fsi-scom.c |  8 ++++++++
>  2 files changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
> index b77013b9d8a7..ca4a9634fbc3 100644
> --- a/drivers/fsi/fsi-core.c
> +++ b/drivers/fsi/fsi-core.c
> @@ -16,6 +16,7 @@
>  #include <linux/idr.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/slab.h>
>  #include <linux/bitops.h>
>  #include <linux/cdev.h>
> @@ -1375,8 +1376,14 @@ static int fsi_bus_match(struct device *dev, struct device_driver *drv)
>  		if (id->engine_type != fsi_dev->engine_type)
>  			continue;
>  		if (id->version == FSI_VERSION_ANY ||
> -				id->version == fsi_dev->version)
> -			return 1;
> +		    id->version == fsi_dev->version) {
> +			if (drv->of_match_table) {
> +				if (of_driver_match_device(dev, drv))
> +					return 1;
> +			} else {
> +				return 1;
> +			}
> +		}
>  	}
>  
>  	return 0;
> diff --git a/drivers/fsi/fsi-scom.c b/drivers/fsi/fsi-scom.c
> index bcb756dc9866..61dbda9dbe2b 100644
> --- a/drivers/fsi/fsi-scom.c
> +++ b/drivers/fsi/fsi-scom.c
> @@ -10,6 +10,7 @@
>  #include <linux/cdev.h>
>  #include <linux/delay.h>
>  #include <linux/fs.h>
> +#include <linux/mod_devicetable.h>
>  #include <linux/uaccess.h>
>  #include <linux/slab.h>
>  #include <linux/list.h>
> @@ -587,6 +588,12 @@ static int scom_remove(struct device *dev)
>  	return 0;
>  }
>  
> +static const struct of_device_id scom_of_ids[] = {
> +	{ .compatible = "ibm,fsi2pib" },

This is not documented. Please add a binding.

Rob