linux-kernel - Re: [PATCH 09/15] firmware: arm_scmi: Add scmi protocol version and id device attributes

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Date:   Wed, 11 Dec 2019 18:08:43 +0000
From:   Cristian Marussi <cristian.marussi@....com>
To:     Sudeep Holla <sudeep.holla@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/15] firmware: arm_scmi: Add scmi protocol version and
 id device attributes

On 10/12/2019 14:53, Sudeep Holla wrote:
> Linux kernel bus driver management layer provides way to add set of
> default attributes of the devices on the bus. Using the same, let's add
> the scmi per protocol version and id attributes to the sysfs.
> 
> It helps to identify the individual protocol details from the sysfs
> entries similar to the SCMI protocol and firmware version.
> 
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>  drivers/firmware/arm_scmi/bus.c | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
> index f619da2634a6..ed0ed02f7158 100644
> --- a/drivers/firmware/arm_scmi/bus.c
> +++ b/drivers/firmware/arm_scmi/bus.c
> @@ -92,11 +92,38 @@ static int scmi_dev_remove(struct device *dev)
>  	return 0;
>  }
> 
> +static ssize_t protocol_version_show(struct device *dev,
> +				     struct device_attribute *attr, char *buf)
> +{
> +	struct scmi_device *scmi_dev = to_scmi_dev(dev);
> +
> +	return sprintf(buf, "%u.%u\n", PROTOCOL_REV_MAJOR(scmi_dev->version),
> +		       PROTOCOL_REV_MINOR(scmi_dev->version));
> +}
> +static DEVICE_ATTR_RO(protocol_version);
> +

Similar issue related to proto/device mixup as said.
Here bus exposes sysfs attributes depending on an scmi_dev

Cristian


> +static ssize_t protocol_id_show(struct device *dev,
> +				struct device_attribute *attr, char *buf)
> +{
> +	struct scmi_device *scmi_dev = to_scmi_dev(dev);
> +
> +	return sprintf(buf, "%u\n", scmi_dev->protocol_id);
> +}
> +static DEVICE_ATTR_RO(protocol_id);
> +
> +static struct attribute *versions_attrs[] = {
> +	&dev_attr_protocol_version.attr,
> +	&dev_attr_protocol_id.attr,
> +	NULL,
> +};
> +ATTRIBUTE_GROUPS(versions);
> +
>  static struct bus_type scmi_bus_type = {
>  	.name =	"scmi_protocol",
>  	.match = scmi_dev_match,
>  	.probe = scmi_dev_probe,
>  	.remove = scmi_dev_remove,
> +	.dev_groups = versions_groups,
>  };
> 
>  int scmi_driver_register(struct scmi_driver *driver, struct module *owner,
> --
> 2.17.1
>