linux-kernel - Re: [PATCH 1/4] firmware: xilinx: Add OSPI Mux selection support

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Message-ID: <YU24KEoXQOw/1uZV@kroah.com>
Date:   Fri, 24 Sep 2021 13:36:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
Cc:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Pratyush Yadav <p.yadav@...com>,
        Michal Simek <michal.simek@...inx.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-spi@...r.kernel.org,
        git@...inx.com, saikrishna12468@...il.com,
        Arnd Bergmann <arnd@...db.de>,
        Nobuhiro Iwamatsu <iwamatsu@...auri.org>
Subject: Re: [PATCH 1/4] firmware: xilinx: Add OSPI Mux selection support

On Fri, Sep 24, 2021 at 03:37:08PM +0530, Sai Krishna Potthuri wrote:
> Add OSPI Mux selection API support to select the AXI interface to OSPI.
> 
> Signed-off-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
> ---
>  drivers/firmware/xilinx/zynqmp.c     | 17 +++++++++++++++++
>  include/linux/firmware/xlnx-zynqmp.h | 12 ++++++++++++
>  2 files changed, 29 insertions(+)
> 
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 15b138326ecc..43c3b5a9eef7 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -647,6 +647,23 @@ int zynqmp_pm_sd_dll_reset(u32 node_id, u32 type)
>  }
>  EXPORT_SYMBOL_GPL(zynqmp_pm_sd_dll_reset);
>  
> +/**
> + * zynqmp_pm_ospi_mux_select() - OSPI Mux selection
> + *
> + * @dev_id:	Device Id of the OSPI device.
> + * @select:	OSPI Mux select value.
> + *
> + * This function select the OSPI Mux.
> + *
> + * Return:	Returns status, either success or error+reason
> + */
> +int zynqmp_pm_ospi_mux_select(u32 dev_id, u32 select)
> +{
> +	return zynqmp_pm_invoke_fn(PM_IOCTL, dev_id, IOCTL_OSPI_MUX_SELECT,
> +				   select, 0, NULL);
> +}
> +EXPORT_SYMBOL_GPL(zynqmp_pm_ospi_mux_select);
> +
>  /**
>   * zynqmp_pm_write_ggs() - PM API for writing global general storage (ggs)
>   * @index:	GGS register index
> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> index 9d1a5c175065..6979a79f553a 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -119,6 +119,7 @@ enum pm_ioctl_id {
>  	IOCTL_READ_PGGS = 15,
>  	/* Set healthy bit value */
>  	IOCTL_SET_BOOT_HEALTH_STATUS = 17,
> +	IOCTL_OSPI_MUX_SELECT = 21,

Why the gap?  What are the commands in the middle for?

thanks,

greg k-h