linux-kernel - Re: [PATCH v2] uio: dfl: add IOPLL user-clock feature id

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Date:   Sat, 27 Aug 2022 13:54:38 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Peter Colberg <peter.colberg@...el.com>
Cc:     Wu Hao <hao.wu@...el.com>, Tom Rix <trix@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        matthew.gerlach@...ux.intel.com,
        basheer.ahmed.muddebihal@...el.com, tianfei.zhang@...el.com,
        marpagan@...hat.com, lgoncalv@...hat.com,
        Russ Weight <russell.h.weight@...el.com>
Subject: Re: [PATCH v2] uio: dfl: add IOPLL user-clock feature id

On 2022-08-26 at 11:01:16 -0400, Peter Colberg wrote:
> Add a Device Feature List (DFL) feature id [1] for the configurable
> IOPLL user clock source, which can be used to configure the clock
> speeds that are used for RTL logic that is programmed into the
> Partial Reconfiguration (PR) region of an FPGA.
> 
> The IOPLL user-space driver [2] contains frequency tables [3]
> with the specific user clock frequencies for an implementation.
> 
> For each desired frequency, the table values are produced by calling
> the quartus tool, the same tool that generates the IOPLL RTL logic.
> The quartus tool allows the RTL designer to select different options
> which can affect the table values. The table-driven, user-space
> driver allows for supporting future, modified implementations and
> provides users the ability to modify the IOPLL implementation.
> 
> [1] https://github.com/OPAE/dfl-feature-id
> [2] https://github.com/OPAE/opae-sdk/blob/a494f54a9f0356d0425edbff228f0254a4c70303/libraries/plugins/xfpga/usrclk/fpga_user_clk.c
> [3] https://github.com/OPAE/opae-sdk/blob/a494f54a9f0356d0425edbff228f0254a4c70303/libraries/plugins/xfpga/usrclk/fpga_user_clk_freq.h
> 
> Signed-off-by: Peter Colberg <peter.colberg@...el.com>
> Signed-off-by: Russ Weight <russell.h.weight@...el.com>

Acked-by: Xu Yilun <yilun.xu@...el.com>

> ---
>  drivers/uio/uio_dfl.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/uio/uio_dfl.c b/drivers/uio/uio_dfl.c
> index 8f39cc8bb034..69e93f3e7faf 100644
> --- a/drivers/uio/uio_dfl.c
> +++ b/drivers/uio/uio_dfl.c
> @@ -46,10 +46,12 @@ static int uio_dfl_probe(struct dfl_device *ddev)
>  
>  #define FME_FEATURE_ID_ETH_GROUP	0x10
>  #define FME_FEATURE_ID_HSSI_SUBSYS	0x15
> +#define PORT_FEATURE_ID_IOPLL_USRCLK	0x14
>  
>  static const struct dfl_device_id uio_dfl_ids[] = {
>  	{ FME_ID, FME_FEATURE_ID_ETH_GROUP },
>  	{ FME_ID, FME_FEATURE_ID_HSSI_SUBSYS },
> +	{ PORT_ID, PORT_FEATURE_ID_IOPLL_USRCLK },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(dfl, uio_dfl_ids);
> -- 
> 2.28.0
>