Re: [PATCH 3/6] misc: sbrmi: Use regmap subsystem

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Jul 04, 2024 at 11:16:21AM +0000, Akshay Gupta wrote:
> - regmap subsystem provides multiple benefits over direct smbus APIs

In what way, please document.

> - The susbsytem can be helpful in following cases
>   - Differnet types of bus (i2c/i3c)
>   - Different Register address size (1byte/2byte)

Is that what is happening here?  I don't see i3c support...

> --- a/include/misc/amd-sb.h
> +++ b/include/misc/amd-sb.h
> @@ -7,8 +7,8 @@
>  #define _AMD_SB_H_
>  
>  #include <linux/mutex.h>
> -#include <linux/i2c.h>

Why remove this?

>  #include <linux/platform_device.h>
> +#include <linux/regmap.h>
>  /*
>   * SB-RMI supports soft mailbox service request to MP1 (power management
>   * firmware) through SBRMI inbound/outbound message registers.
> @@ -23,11 +23,11 @@ enum sbrmi_msg_id {
>  
>  /* Each client has this additional data */
>  struct sbrmi_data {
> -	struct i2c_client *client;
> +	struct regmap *regmap;
>  	struct mutex lock;
>  	struct platform_device *pdev;
>  	u32 pwr_limit_max;
> -};
> +} __packed;

Why is this suddenly required to be __packed?

Isn't that going to cause more problems than it is worth?  And why is it
worth it at all?

thanks,

greg k-h