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Message-ID: <MWHPR02MB26232753E624335632BCE511C2A30@MWHPR02MB2623.namprd02.prod.outlook.com>
Date: Tue, 19 Jan 2021 06:16:50 +0000
From: Nava kishore Manne <navam@...inx.com>
To: Tom Rix <trix@...hat.com>, "mdf@...nel.org" <mdf@...nel.org>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
Michal Simek <michals@...inx.com>,
"linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: git <git@...inx.com>,
"chinnikishore369@...il.com" <chinnikishore369@...il.com>
Subject: RE: [PATCH 2/2] fpga: Add support for Xilinx DFX AXI Shutdown manager
Hi Tom,
Thanks for the review.
Please find my response inline.
> -----Original Message-----
> From: Tom Rix <trix@...hat.com>
> Sent: Friday, January 15, 2021 11:56 PM
> To: Nava kishore Manne <navam@...inx.com>; mdf@...nel.org;
> robh+dt@...nel.org; Michal Simek <michals@...inx.com>; linux-
> fpga@...r.kernel.org; devicetree@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
> Cc: git <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
>
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.
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