RE: [PATCH 2/2] fpga: Add support for Xilinx DFX AXI Shutdown manager

[Nava kishore Manne]

Hi Tom,

	Thanks for the review.
Please find my response inline.

> -----Original Message-----
> From: Tom Rix <trix@xxxxxxxxxx>
> Sent: Friday, January 15, 2021 11:56 PM
> To: Nava kishore Manne <navam@xxxxxxxxxx>; mdf@xxxxxxxxxx;
> robh+dt@xxxxxxxxxx; Michal Simek <michals@xxxxxxxxxx>; linux-
> fpga@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Cc: git <git@xxxxxxxxxx>; chinnikishore369@xxxxxxxxx
> 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@xxxxxxxxxx>
> > ---
> >  drivers/fpga/xilinx-pr-decoupler.c | 35
> > ++++++++++++++++++++++++++----
> 
> It looks like the copyright is wrong, please review spelling of Xilix
> 
>  * Copyright (c) 2017, Xilix Inc
> 
Will fix in v2.
> 
> >  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.
> 
Will fix in v2.

> could you 'const' char *name ?
> 
Will fix in v2.
> > +
> >  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
> 

Will fix in v2.

> > +};
> > +
> >  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
>

Will in v2.

Regards,
Navakishore.