linux-kernel - Re: [PATCH v3 3/3] firmware: xilinx: Add sysfs support for feature config

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Message-ID: <YanhxIoxkPb+rYN5@kroah.com>
Date:   Fri, 3 Dec 2021 10:22:12 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Ronak Jain <ronak.jain@...inx.com>
Cc:     michal.simek@...inx.com, linux-kernel@...r.kernel.org,
        rajan.vaja@...inx.com, corbet@....net,
        linux-arm-kernel@...ts.infradead.org, arnd@...db.de,
        lakshmi.sai.krishna.potthuri@...inx.com
Subject: Re: [PATCH v3 3/3] firmware: xilinx: Add sysfs support for feature
 config

On Fri, Dec 03, 2021 at 01:18:14AM -0800, Ronak Jain wrote:
> Add support for sysfs interface for runtime features configuration.
>  The user can configure the features at runtime. First the user need
>  to select the config id of the supported features and then the user
>  can configure the parameters of the feature based on the config id.
>  So far the support is added for the over temperature and external
>  watchdog features.
> 
> Added zynqmp_devinfo structure to handle muliple driver instances
>  when accessed by multiple devices.
> 
> Signed-off-by: Ronak Jain <ronak.jain@...inx.com>
> ---
> Changes in v3:
> - Added zynqmp_devinfo structure to store device instances
> - Modified feature_conf_id from atomic variable to u32
> - Update commit message
> - Resolved merge conflicts
> 
> Changes in v2:
> - Update commit message
> ---
>  drivers/firmware/xilinx/zynqmp.c | 93 ++++++++++++++++++++++++++++++++
>  1 file changed, 93 insertions(+)
> 
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 6b05844e67d7..f37a8e805cd7 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -38,6 +38,16 @@
>  static bool feature_check_enabled;
>  static DEFINE_HASHTABLE(pm_api_features_map, PM_API_FEATURE_CHECK_MAX_ORDER);
>  
> +/**
> + * struct zynqmp_devinfo - Structure for Zynqmp device instance
> + * @dev:		Device Pointer
> + * @feature_conf_id:	Feature conf id
> + */
> +struct zynqmp_devinfo {
> +	struct device *dev;
> +	u32 feature_conf_id;
> +};
> +
>  /**
>   * struct pm_api_feature_data - PM API Feature data
>   * @pm_api_id:		PM API Id, used as key to index into hashmap
> @@ -1424,6 +1434,78 @@ static DEVICE_ATTR_RW(pggs1);
>  static DEVICE_ATTR_RW(pggs2);
>  static DEVICE_ATTR_RW(pggs3);
>  
> +static ssize_t feature_config_id_show(struct device *device,
> +				      struct device_attribute *attr,
> +				      char *buf)
> +{
> +	struct zynqmp_devinfo *devinfo = dev_get_drvdata(device);
> +
> +	return sysfs_emit(buf, "%d\n", devinfo->feature_conf_id);
> +}

You are adding new sysfs files without any Documentation/ABI/ entries :(

Please fix.

thanks,

greg k-h