linux-kernel - Re: [PATCH 2/2] fpga: Add support for Xilinx DFX AXI Shutdown manager

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Message-ID: <2dc469ae-cdf4-0774-c786-7dd01c4914c9@redhat.com>
Date:   Fri, 15 Jan 2021 10:26:19 -0800
From:   Tom Rix <trix@...hat.com>
To:     Nava kishore Manne <nava.manne@...inx.com>, mdf@...nel.org,
        robh+dt@...nel.org, michal.simek@...inx.com,
        linux-fpga@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     git@...inx.com, chinnikishore369@...il.com
Subject: Re: [PATCH 2/2] fpga: Add support for Xilinx DFX AXI Shutdown manager


On 1/14/21 5:34 PM, Nava kishore Manne wrote:
> This patch adds support for Xilinx Dynamic Function eXchange(DFX) AXI
> shutdown manager IP. It can be used to safely handling the AXI traffic
> on a Reconfigurable Partition when it is undergoing dynamic reconfiguration
> and there by preventing system deadlock that may occur if AXI transactions
> are interrupted during reconfiguration.
>
> PR-Decoupler and AXI shutdown manager are completely different IPs.
> But both the IP registers are compatible and also both belong to the
> same sub-system (fpga-bridge).So using same driver for both IP's.
>
> Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> ---
>  drivers/fpga/xilinx-pr-decoupler.c | 35 ++++++++++++++++++++++++++----

It looks like the copyright is wrong, please review spelling of Xilix

 * Copyright (c) 2017, Xilix Inc


>  1 file changed, 31 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/fpga/xilinx-pr-decoupler.c b/drivers/fpga/xilinx-pr-decoupler.c
> index 7d69af230567..c95f3d065ccb 100644
> --- a/drivers/fpga/xilinx-pr-decoupler.c
> +++ b/drivers/fpga/xilinx-pr-decoupler.c
> @@ -19,10 +19,15 @@
>  #define CTRL_OFFSET		0
>  
>  struct xlnx_pr_decoupler_data {
> +	const struct xlnx_config_data *ipconfig;
>  	void __iomem *io_base;
>  	struct clk *clk;
>  };
>  
> +struct xlnx_config_data {
> +	char *name;
> +};

Move xlnx_config_data above xlnx_pr_decouple_data.

could you 'const' char *name ?

> +
>  static inline void xlnx_pr_decoupler_write(struct xlnx_pr_decoupler_data *d,
>  					   u32 offset, u32 val)
>  {
> @@ -76,15 +81,28 @@ static const struct fpga_bridge_ops xlnx_pr_decoupler_br_ops = {
>  	.enable_show = xlnx_pr_decoupler_enable_show,
>  };
>  
> +static const struct xlnx_config_data decoupler_config = {
> +	.name = "Xilinx PR Decoupler",
> +};
> +
> +static const struct xlnx_config_data shutdown_config = {
> +	.name = "Xilinx DFX AXI shutdown mgr",

To be consistent with decoupler name,

shutdown mgr -> Shutdown Manager

> +};
> +
>  static const struct of_device_id xlnx_pr_decoupler_of_match[] = {
> -	{ .compatible = "xlnx,pr-decoupler-1.00", },
> -	{ .compatible = "xlnx,pr-decoupler", },
> +	{ .compatible = "xlnx,pr-decoupler-1.00", .data = &decoupler_config },
> +	{ .compatible = "xlnx,pr-decoupler", .data = &decoupler_config },
> +	{ .compatible = "xlnx,dfx-axi-shutdown-manager-1.00",
> +					.data = &shutdown_config },
> +	{ .compatible = "xlnx,dfx-axi-shutdown-manager",
> +					.data = &shutdown_config },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, xlnx_pr_decoupler_of_match);
>  
>  static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
>  {
> +	struct device_node *np = pdev->dev.of_node;
>  	struct xlnx_pr_decoupler_data *priv;
>  	struct fpga_bridge *br;
>  	int err;
> @@ -94,6 +112,14 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
>  	if (!priv)
>  		return -ENOMEM;
>  
> +	if (np) {
> +		const struct of_device_id *match;
> +
> +		match = of_match_node(xlnx_pr_decoupler_of_match, np);
> +		if (match && match->data)
> +			priv->ipconfig = match->data;
> +	}
> +
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	priv->io_base = devm_ioremap_resource(&pdev->dev, res);
>  	if (IS_ERR(priv->io_base))
> @@ -114,7 +140,7 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
>  
>  	clk_disable(priv->clk);
>  
> -	br = devm_fpga_bridge_create(&pdev->dev, "Xilinx PR Decoupler",
> +	br = devm_fpga_bridge_create(&pdev->dev, priv->ipconfig->name,
>  				     &xlnx_pr_decoupler_br_ops, priv);
>  	if (!br) {
>  		err = -ENOMEM;
> @@ -125,7 +151,8 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
>  
>  	err = fpga_bridge_register(br);
>  	if (err) {
> -		dev_err(&pdev->dev, "unable to register Xilinx PR Decoupler");
> +		dev_err(&pdev->dev, "unable to register %s",
> +			priv->ipconfig->name);
>  		goto err_clk;
>  	}

Look at XILINX_PR_DECOUPLER entry in Kconfig, maybe add something like

help

  Say Y to enable drivers for the  ... Decoupler or DFX AIX Shutdown Manager

Tom

>