linux-kernel - Re: [PATCH mfd v2 1/2] mfd: rsmu: support I2C SMBus access

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Date: Fri, 3 May 2024 10:32:27 +0100
From: Lee Jones <lee@...nel.org>
To: Min Li <lnimi@...mail.com>
Cc: linux-kernel@...r.kernel.org, Min Li <min.li.xe@...esas.com>
Subject: Re: [PATCH mfd v2 1/2] mfd: rsmu: support I2C SMBus access

On Wed, 01 May 2024, Min Li wrote:

> From: Min Li <min.li.xe@...esas.com>
> 
> 8a3400x device implements its own reg_read and reg_write,
> which only supports I2C bus access. This patch adds support
> for SMBus access.
> 
> Signed-off-by: Min Li <min.li.xe@...esas.com>
> ---
> - Provide cover-letter suggested by Lee
> 
>  drivers/mfd/rsmu_i2c.c | 107 +++++++++++++++++++++++++++++++++++------
>  drivers/mfd/rsmu_spi.c |   8 +--
>  2 files changed, 97 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/mfd/rsmu_i2c.c b/drivers/mfd/rsmu_i2c.c
> index 5711e512b..cba64f107 100644
> --- a/drivers/mfd/rsmu_i2c.c
> +++ b/drivers/mfd/rsmu_i2c.c
> @@ -32,6 +32,8 @@
>  #define	RSMU_SABRE_PAGE_ADDR		0x7F
>  #define	RSMU_SABRE_PAGE_WINDOW		128
>  
> +typedef int (*rsmu_rw_device)(struct rsmu_ddata *rsmu, u8 reg, u8 *buf, u8 bytes);

We're not going to start passing around function points all over the
place.  Use a variable 'bool smbus'(?) instead and call the correct
helper based on that instead.

-- 
Lee Jones [李琼斯]