From: Ray Jui <rjui@broadcom.com>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>,
Arnd Bergmann <arnd@arndb.de>, Hauke Mehrtens <hauke@hauke-m.de>,
<linux-kernel@vger.kernel.org>,
<bcm-kernel-feedback-list@broadcom.com>,
<linux-pci@vger.kernel.org>, Ray Jui <rjui@broadcom.com>
Subject: [PATCH v3 3/5] PCI: iproc: Add iProc PCIe MSI device tree binding
Date: Thu, 26 Nov 2015 14:37:08 -0800 [thread overview]
Message-ID: <1448577430-16428-4-git-send-email-rjui@broadcom.com> (raw)
In-Reply-To: <1448577430-16428-1-git-send-email-rjui@broadcom.com>
This patch updates the iProc PCIe device tree bindings with added
binding information for MSI
Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Vikram Prakash <vikramp@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
---
.../devicetree/bindings/pci/brcm,iproc-pcie.txt | 35 ++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
index 06eae0f..acbdbad 100644
--- a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
@@ -35,6 +35,28 @@ Optional:
- brcm,pcie-ob-oarr-size: Some iProc SoCs need the OARR size bit to be set to
increase the outbound window size
+MSI support (optional):
+
+For older platforms without MSI integrated in the GIC, iProc PCIe core provides
+an event queue based MSI support. The iProc MSI uses host memories to store
+MSI posted writes in the event queues
+
+- msi-parent: Link to the device node of the MSI controller. On newer iProc
+platforms, the MSI controller may be gicv2m or gicv3-its. On older iProc
+platforms without MSI support in its interrupt controller, one may use the
+event queue based MSI support integrated within the iProc PCIe core
+
+When the iProc event queue based MSI is used, one needs to define the
+following properties in the MSI device node:
+- compatible: Must be "brcm,iproc-msi"
+- msi-controller: claims itself as an MSI controller
+- interrupt-parent: Link to its parent interrupt device
+- interrupts: List of interrupt IDs from its parent interrupt device
+
+Optional properties:
+- brcm,pcie-msi-inten: Needs to be present for some older iProc platforms that
+require the interrupt enable registers to be set explicitly to enable MSI
+
Example:
pcie0: pcie@18012000 {
compatible = "brcm,iproc-pcie";
@@ -61,6 +83,19 @@ Example:
brcm,pcie-ob-oarr-size;
brcm,pcie-ob-axi-offset = <0x00000000>;
brcm,pcie-ob-window-size = <256>;
+
+ msi-parent = <&msi0>;
+
+ /* iProc event queue based MSI */
+ msi0: msi@18012000 {
+ compatible = "brcm,iproc-msi";
+ msi-controller;
+ interrupt-parent = <&gic>;
+ interrupts = <GIC_SPI 96 IRQ_TYPE_NONE>,
+ <GIC_SPI 97 IRQ_TYPE_NONE>,
+ <GIC_SPI 98 IRQ_TYPE_NONE>,
+ <GIC_SPI 99 IRQ_TYPE_NONE>,
+ };
};
pcie1: pcie@18013000 {
--
1.9.1
next prev parent reply other threads:[~2015-11-26 22:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-26 22:37 [PATCH v3 0/5] Add iProc PCIe PAXC and MSI support Ray Jui
2015-11-26 22:37 ` [PATCH v3 1/5] PCI: iproc: Update iProc PCIe device tree binding Ray Jui
2015-11-26 22:37 ` [PATCH v3 2/5] PCI: iproc: Add PAXC interface support Ray Jui
2015-11-26 22:37 ` Ray Jui [this message]
2015-11-26 22:37 ` [PATCH v3 4/5] PCI: iproc: Add iProc PCIe MSI support Ray Jui
2015-11-27 15:17 ` Marc Zyngier
2015-11-27 15:57 ` Ray Jui
2015-11-26 22:37 ` [PATCH v3 5/5] ARM: dts: Enable MSI support for Broadcom Cygnus Ray Jui
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1448577430-16428-4-git-send-email-rjui@broadcom.com \
--to=rjui@broadcom.com \
--cc=arnd@arndb.de \
--cc=bcm-kernel-feedback-list@broadcom.com \
--cc=bhelgaas@google.com \
--cc=hauke@hauke-m.de \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=marc.zyngier@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).