Re: [PATCH 1/2] mfd: intel-m10-bmc: specify the retimer sub devices

[Lee Jones <lee.jones@linaro.org>]

On Wed, 06 Jan 2021, Xu Yilun wrote:

> The patch specifies the 2 retimer sub devices and their resources in the
> parent driver's mfd_cell. It also adds the register definition of the
> retimer sub devices.
> 
> There are 2 ethernet retimer chips (C827) connected to the Intel MAX 10
> BMC. They are managed by the BMC firmware, and host could query them via
> retimer interfaces (shared registers) on the BMC. The 2 retimers have
> identical register interfaces in different register addresses or fields,
> so it is better we define 2 retimer devices and handle them with the same
> driver.
> 
> Signed-off-by: Xu Yilun <yilun.xu@intel.com>
> ---
>  drivers/mfd/intel-m10-bmc.c       | 19 ++++++++++++++++++-
>  include/linux/mfd/intel-m10-bmc.h |  7 +++++++
>  2 files changed, 25 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/intel-m10-bmc.c b/drivers/mfd/intel-m10-bmc.c
> index b84579b..e0a99a0 100644
> --- a/drivers/mfd/intel-m10-bmc.c
> +++ b/drivers/mfd/intel-m10-bmc.c
> @@ -17,9 +17,26 @@ enum m10bmc_type {
>  	M10_N3000,
>  };
>  
> +static struct resource retimer0_resources[] = {
> +	{M10BMC_PKVL_A_VER, M10BMC_PKVL_A_VER, "version", IORESOURCE_REG, },
> +};
> +
> +static struct resource retimer1_resources[] = {
> +	{M10BMC_PKVL_B_VER, M10BMC_PKVL_B_VER, "version", IORESOURCE_REG, },
> +};

Please use the DEFINE_RES_*() helpers for this.

>  static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
>  	{ .name = "n3000bmc-hwmon" },
> -	{ .name = "n3000bmc-retimer" },
> +	{
> +		.name = "n3000bmc-retimer",
> +		.num_resources = ARRAY_SIZE(retimer0_resources),
> +		.resources = retimer0_resources,
> +	},
> +	{
> +		.name = "n3000bmc-retimer",
> +		.num_resources = ARRAY_SIZE(retimer1_resources),
> +		.resources = retimer1_resources,
> +	},
>  	{ .name = "n3000bmc-secure" },
>  };
>  
> diff --git a/include/linux/mfd/intel-m10-bmc.h b/include/linux/mfd/intel-m10-bmc.h
> index c8ef2f1..d6216f9 100644
> --- a/include/linux/mfd/intel-m10-bmc.h
> +++ b/include/linux/mfd/intel-m10-bmc.h
> @@ -21,6 +21,13 @@
>  #define M10BMC_VER_PCB_INFO_MSK		GENMASK(31, 24)
>  #define M10BMC_VER_LEGACY_INVALID	0xffffffff
>  
> +/* Retimer related registers, in system register region */
> +#define M10BMC_PKVL_LSTATUS		0x164
> +#define M10BMC_PKVL_A_VER		0x254
> +#define M10BMC_PKVL_B_VER		0x258
> +#define M10BMC_PKVL_SERDES_VER		GENMASK(15, 0)
> +#define M10BMC_PKVL_SBUS_VER		GENMASK(31, 16)
> +
>  /**
>   * struct intel_m10bmc - Intel MAX 10 BMC parent driver data structure
>   * @dev: this device

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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