linux-kernel - Re: [PATCH 05/15] firmware: arm_scmi: Add versions and identifier attributes using dev

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Date:   Wed, 11 Dec 2019 13:21:13 +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 05/15] firmware: arm_scmi: Add versions and identifier
 attributes using dev_groups

On 10/12/2019 14:53, Sudeep Holla wrote:
> Platform drivers now have the option to have the platform core create
> and remove any needed sysfs attribute files. Using the same, let's add
> the scmi firmware and protocol version attributes as well as vendor and
> sub-vendor identifiers to sysfs.
> 
> It helps to identify the firmware details from the sysfs entries similar
> to ARM SCPI implementation.
> 
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>  drivers/firmware/arm_scmi/driver.c | 47 ++++++++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
> 
> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> index 0bbdc7c9eb0f..26b2c438bd59 100644
> --- a/drivers/firmware/arm_scmi/driver.c
> +++ b/drivers/firmware/arm_scmi/driver.c
> @@ -979,6 +979,52 @@ static int scmi_remove(struct platform_device *pdev)
>  	return ret;
>  }
> 
> +static ssize_t protocol_version_show(struct device *dev,
> +				     struct device_attribute *attr, char *buf)
> +{
> +	struct scmi_info *info = dev_get_drvdata(dev);
> +
> +	return sprintf(buf, "%u.%u\n", info->version.major_ver,
> +		       info->version.minor_ver);
> +}
> +static DEVICE_ATTR_RO(protocol_version);
> +
> +static ssize_t firmware_version_show(struct device *dev,
> +				     struct device_attribute *attr, char *buf)
> +{
> +	struct scmi_info *info = dev_get_drvdata(dev);
> +
> +	return sprintf(buf, "0x%x\n", info->version.impl_ver);
> +}
> +static DEVICE_ATTR_RO(firmware_version);
> +
> +static ssize_t vendor_id_show(struct device *dev,
> +			      struct device_attribute *attr, char *buf)
> +{
> +	struct scmi_info *info = dev_get_drvdata(dev);
> +
> +	return sprintf(buf, "%s\n", info->version.vendor_id);
> +}
> +static DEVICE_ATTR_RO(vendor_id);
> +
> +static ssize_t sub_vendor_id_show(struct device *dev,
> +				  struct device_attribute *attr, char *buf)
> +{
> +	struct scmi_info *info = dev_get_drvdata(dev);
> +
> +	return sprintf(buf, "%s\n", info->version.sub_vendor_id);
> +}
> +static DEVICE_ATTR_RO(sub_vendor_id);
> +
> +static struct attribute *versions_attrs[] = {
> +	&dev_attr_firmware_version.attr,
> +	&dev_attr_protocol_version.attr,
> +	&dev_attr_vendor_id.attr,
> +	&dev_attr_sub_vendor_id.attr,
> +	NULL,
> +};
> +ATTRIBUTE_GROUPS(versions);
> +
>  static const struct scmi_desc scmi_generic_desc = {
>  	.max_rx_timeout_ms = 30,	/* We may increase this if required */
>  	.max_msg = 20,		/* Limited by MBOX_TX_QUEUE_LEN */
> @@ -997,6 +1043,7 @@ static struct platform_driver scmi_driver = {
>  	.driver = {
>  		   .name = "arm-scmi",
>  		   .of_match_table = scmi_of_match,
> +		   .dev_groups = versions_groups,
>  		   },
>  	.probe = scmi_probe,
>  	.remove = scmi_remove,
> --
> 2.17.1
> 

LGTM.

Reviewed-by: Cristian Marussi <cristian.marussi@....com>


Cristian