linux-kernel - Re: [RFC PATCH 1/3] mfd: syscon: Add reg_update

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Date:   Thu, 9 Apr 2020 11:48:02 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Baolin Wang <baolin.wang7@...il.com>
Cc:     lee.jones@...aro.org, arnd@...db.de, orsonzhai@...il.com,
        zhang.lyra@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/3] mfd: syscon: Add reg_update_bits() callback
 support

On Thu, Apr 09, 2020 at 04:57:57PM +0800, Baolin Wang wrote:

> --- a/include/linux/regmap.h
> +++ b/include/linux/regmap.h
> @@ -340,6 +340,8 @@ struct regmap_access_table {
>   *		  read operation on a bus such as SPI, I2C, etc. Most of the
>   *		  devices do not need this.
>   * @reg_write:	  Same as above for writing.
> + * @reg_update_bits: Optional, should only be provided for devices whose update
> + *		     operation cannot be represented as read and write.
>   * @fast_io:	  Register IO is fast. Use a spinlock instead of a mutex
>   *	     	  to perform locking. This field is ignored if custom lock/unlock
>   *	     	  functions are used (see fields lock/unlock of struct regmap_config).
> @@ -416,6 +418,8 @@ struct regmap_config {
>  
>  	int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
>  	int (*reg_write)(void *context, unsigned int reg, unsigned int val);
> +	int (*reg_update_bits)(void *context, unsigned int reg,
> +			       unsigned int mask, unsigned int val);

This is fine, we already have this operation for buses, but why is this
munged in with the MFD patch?

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