linux-kernel - [RFC PATCH 0/2] add support for CDX bus MSI domain

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Date:   Wed, 3 Aug 2022 17:56:53 +0530
From:   Nipun Gupta <nipun.gupta@....com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <gregkh@...uxfoundation.org>, <rafael@...nel.org>,
        <maz@...nel.org>, <tglx@...utronix.de>
CC:     <okaya@...nel.org>, <harpreet.anand@....com>,
        <michal.simek@....com>, <nikhil.agarwal@....com>,
        Nipun Gupta <nipun.gupta@....com>
Subject: [RFC PATCH 0/2] add support for CDX bus MSI domain

Devices in FPGA can be added/modified dynamically on run-time.
These devices are exposed on system bus to embedded CPUs.

CDX is an upcoming bus, that caters to the requirement for 
dynamically discovered FPGA devices. These devices are added
as platform devices where fwnode is created using 'software
nodes' in Linux framework.

This RFC targets to solves 2 issues when adding devices
dynamically using platform_device_register API.

1. It creates a MSI domain for CDX bus devices, which can 
   discover device ID used by GIC ITS without depending
   on of_node.
2. Since these devices are not present in device tree, it
   creates a sysfs entry to expose the compatible string.

Nipun Gupta (2):
  irqchip: cdx-bus: add cdx-MSI domain with gic-its domain as parent
  driver core: add compatible string in sysfs for platform devices

 drivers/base/platform.c                  |  15 +++
 drivers/irqchip/Makefile                 |   1 +
 drivers/irqchip/irq-gic-v3-its-cdx-msi.c | 114 +++++++++++++++++++++++
 include/linux/cdx/cdx.h                  |  15 +++
 4 files changed, 145 insertions(+)
 create mode 100644 drivers/irqchip/irq-gic-v3-its-cdx-msi.c
 create mode 100644 include/linux/cdx/cdx.h

-- 
2.25.1