Date:   Thu, 19 May 2022 20:10:44 -0700
From:   <tanmay.shah@...inx.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        <bjorn.andersson@...aro.org>, <robh+dt@...nel.org>,
        <krzk+dt@...nel.org>, <michal.simek@...inx.com>,
        <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 0/6] Add Xilinx RPU subsystem support



On 5/19/22 3:19 AM, Mathieu Poirier <mathieu.poirier@...aro.org> wrote:
> Hi Tanmay,
> 
> I have replaced the previous version of this set with this one in my
> queue.  That way you don't go back to the bottom.
> 

Thanks Mathieu. Sure it will help.

> Thanks,
> Mathieu.
> 
> On Wed, 18 May 2022 at 20:46, Tanmay Shah <tanmay.shah@...inx.com> wrote:
> >
> > This patch series adds bindings document for RPU subsystem found on Xilinx
> > ZynqMP platforms. It also adds device nodes and driver to enable RPU
> > subsystem in split mode and lockstep mode.
> >
> > Xilinx ZynqMP platform contains Remote Processing Unit(RPU). RPU subsystem
> > contains two arm cortex r5f cores. RPU subsystem can be configured in
> > split mode, lockstep mode and single-cpu mode.
> >
> > RPU subsystem also contains 4 Tightly Coupled Memory(TCM) banks.
> > In lockstep mode, all 4 banks are combined and total of 256KB memory is
> > made available to r5 core0. In split mode, both cores can access two
> > TCM banks i.e. 128 KB.
> >
> > RPU can also fetch data and execute instructions from DDR memory along with
> > TCM memory.
> > ---
> >
> > Changes in v5:
> >    - Add constraints of the possible values of xlnx,cluster-mode property
> >    - fix description of power-domains property for r5 core
> >    - Remove reg, address-cells and size-cells properties as it is not required
> >    - Fix description of mboxes property
> >    - Add description of each memory-region and remove old .txt binding link
> >      reference in the description
> >    - Remove optional reg property from r5fss node
> >    - Move r5fss node out of axi node
> >
> > Changes in v4:
> >    - Add memory-region, mboxes and mbox-names properties in dt-bindings example
> >    - Add reserved memory region node and use it in Xilinx dt RPU subsystem node
> >    - Remove redundant header files
> >    - use dev_err_probe() to report errors during probe
> >    - Fix missing check on error code returned by zynqmp_r5_add_rproc_core()
> >    - Fix memory leaks all over the driver when resource allocation fails for any core
> >    - make cluster mode check only at one place
> >    - remove redundant initialization of variable
> >    - remove redundant use of of_node_put()
> >    - Fix Comment format problem
> >    - Assign offset of zynqmp_tcm_banks instead of duplicating it
> >    - Add tcm and memory regions rproc carveouts during prepare instead of parse_fw
> >    - Remove rproc_mem_entry object from r5_core
> >    - Use put_device() and rproc_del() APIs to fix memory leaks
> >    - Replace pr_* with dev_*. This was missed in v3, fix now.
> >    - Use "GPL" instead of "GPL v2" in MODULE_LICENSE macro. This was reported by checkpatch script.
> >
> > Changes in v3:
> >    - Fix checkpatch script indentation warning
> >    - Remove unused variable from xilinx remoteproc driver
> >    - use C style comments, i.e /*...*/
> >    - Remove redundant debug information which can be derived using /proc/device-tree
> >    - Fix multiline comment format
> >    - s/"final fot TCM"/"final for TCM"
> >    - Function devm_kzalloc() does not return an code on error, just NULL.
> >      Remove redundant error check for this function throughout the driver.
> >    - Fix RPU mode configuration and add documentation accordingly
> >    - Get rid of the indentations to match function documentation style with rest of the driver
> >    - Fix memory leak by only using r5_rproc->priv and not replace it with new instance
> >    - Use 'i' for the outer loop and 'j' for the inner one as per convention
> >    - Remove redundant error and NULL checks throughout the driver
> >    - Use devm_kcalloc() when more than one element is required
> >    - Add memory-regions carveouts during driver probe instead of parse_fw call
> >      This removes redundant copy of reserved_mem object in r5_core structure.
> >    - Fix memory leak by using of_node_put()
> >    - Fix indentation of tcm_mem_map function args
> >    - Remove redundant init of variables
> >    - Initialize tcm bank size variable for lockstep mode
> >    - Replace u32 with phys_addr_t for variable stroing memory bank address
> >    - Add documentation of TCM behavior in lockstep mode
> >    - Use dev_get_drvdata instead of platform driver API
> >    - Remove info level messages
> >    - Fix checkpatch.pl warnings
> >    - Add documentation for the Xilinx r5f platform to understand driver design
> >
> > Changes in v2:
> >    - Remove proprietary copyright footer from cover letter
> >
> >
> > Ben Levinsky (3):
> >    firmware: xilinx: Add ZynqMP firmware ioctl enums for RPU
> >      configuration.
> >    firmware: xilinx: Add shutdown/wakeup APIs
> >    firmware: xilinx: Add RPU configuration APIs
> >
> > Tanmay Shah (3):
> >    dt-bindings: remoteproc: Add Xilinx RPU subsystem bindings
> >    arm64: dts: xilinx: zynqmp: Add RPU subsystem device node
> >    drivers: remoteproc: Add Xilinx r5 remoteproc driver
> >
> >   .../bindings/remoteproc/xlnx,r5f-rproc.yaml   |  128 ++
> >   arch/arm64/boot/dts/xilinx/zynqmp.dtsi        |   33 +
> >   drivers/firmware/xilinx/zynqmp.c              |   97 ++
> >   drivers/remoteproc/Kconfig                    |   12 +
> >   drivers/remoteproc/Makefile                   |    1 +
> >   drivers/remoteproc/xlnx_r5_remoteproc.c       | 1045 +++++++++++++++++
> >   include/dt-bindings/power/xlnx-zynqmp-power.h |    6 +
> >   include/linux/firmware/xlnx-zynqmp.h          |   60 +
> >   8 files changed, 1382 insertions(+)
> >   create mode 100644 Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml
> >   create mode 100644 drivers/remoteproc/xlnx_r5_remoteproc.c
> >
> >
> > base-commit: 01a1a0c8d456b11f2f6b9b822414481beaa44d6f
> > --
> > 2.25.1
> >
> 

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