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Message-ID: <BY5PR02MB69470346E9E634F6C699FB95A5A69@BY5PR02MB6947.namprd02.prod.outlook.com>
Date: Fri, 10 Jun 2022 08:47:41 +0000
From: Bharat Kumar Gogada <bharatku@...inx.com>
To: Bjorn Helgaas <helgaas@...nel.org>
CC: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
Michal Simek <michals@...inx.com>,
"robh@...nel.org" <robh@...nel.org>
Subject: RE: [PATCH v4 2/2] PCI: xilinx-cpm: Add support for Versal CPM5 Root
Port
>
> On Wed, Jun 08, 2022 at 10:10:46PM +0530, Bharat Kumar Gogada wrote:
> > Xilinx Versal Premium series has CPM5 block which supports Root Port
> > functioning at Gen5 speed.
> >
> > Xilinx Versal CPM5 has few changes with existing CPM block.
> > - CPM5 has dedicated register space for control and status registers.
> > - CPM5 legacy interrupt handling needs additional register bit
> > to enable and handle legacy interrupts.
> >
> > Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
> > ---
> > drivers/pci/controller/pcie-xilinx-cpm.c | 33
> > +++++++++++++++++++++++-
> > 1 file changed, 32 insertions(+), 1 deletion(-)
>
> Per MAINTAINERS, xilinx-cpm lacks a maintainer. Can we get one?
>
> > diff --git a/drivers/pci/controller/pcie-xilinx-cpm.c
> > b/drivers/pci/controller/pcie-xilinx-cpm.c
> > index c7cd44ed4dfc..a3b04083b6b3 100644
> > --- a/drivers/pci/controller/pcie-xilinx-cpm.c
> > +++ b/drivers/pci/controller/pcie-xilinx-cpm.c
> > @@ -35,6 +35,10 @@
> > #define XILINX_CPM_PCIE_MISC_IR_ENABLE 0x00000348
> > #define XILINX_CPM_PCIE_MISC_IR_LOCAL BIT(1)
> >
> > +#define XILINX_CPM_PCIE_IR_STATUS 0x000002A0
> > +#define XILINX_CPM_PCIE_IR_ENABLE 0x000002A8
> > +#define XILINX_CPM_PCIE_IR_LOCAL BIT(0)
> > +
> > /* Interrupt registers definitions */
> > #define XILINX_CPM_PCIE_INTR_LINK_DOWN 0
> > #define XILINX_CPM_PCIE_INTR_HOT_RESET 3
> > @@ -109,6 +113,7 @@
> > * @intx_irq: legacy interrupt number
> > * @irq: Error interrupt number
> > * @lock: lock protecting shared register access
> > + * @is_cpm5: value to check cpm version
>
> s/cpm version/CPM version/ to match commit log usage.
>
> > + port->is_cpm5 = of_device_is_compatible(dev->of_node,
> > + "xlnx,versal-cpm5-host");
>
> One use of of_device_is_compatible() is OK, I guess, but
> of_device_get_match_data() is a better pattern if we ever need more.
>
> I would lean toward of_device_get_match_data() even here, just to reduce
> the number of ways to identify device-specific things across drivers.
>
Thanks Bjorn, will add this change in next patch.
Regards,
bharat
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