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Date: Fri, 15 Jan 2021 18:58:23 -0800 From: Moritz Fischer <mdf@...nel.org> To: Nava kishore Manne <nava.manne@...inx.com> Cc: mdf@...nel.org, trix@...hat.com, 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, git@...inx.com, chinnikishore369@...il.com Subject: Re: [PATCH 2/2] fpga: Add support for Xilinx DFX AXI Shutdown manager Hi, On Fri, Jan 15, 2021 at 07:04:31AM +0530, 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. I'm a bit confused, the whole goal here is to give the thing a different name? > > Signed-off-by: Nava kishore Manne <nava.manne@...inx.com> > --- > drivers/fpga/xilinx-pr-decoupler.c | 35 ++++++++++++++++++++++++++---- > 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; > +}; > + > 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", > +}; If it's just the strings, why not store them as is? > + > 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; > } > > -- > 2.18.0 > Thanks, Moritz
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