[PATCH 2/5] ARM: NSP: add minimal Northstar Plus device tree

On Tue, Aug 25, 2015 at 04:36:45PM -0700, Olof Johansson wrote:

Hi,

I'm not sure what the strategy behind your cc:ing on this patch set
is. I only got a couple of them in my inbox, and this one wasn't one
of them. :)

I sent them to the people listed as maintainers in get_maintainer.pl.
It didn't seem to include you in all of them, but I thought the
mailing list would be enough of a catch all.  My apologies.  I'll CC
everyone listed as a maintainer on all of the patches in the future.

On Thu, Aug 20, 2015 at 10:46 AM, Jon Mason [off-list ref] wrote:

quoted

Add a very minimalistic set of Northstar Plus Device Tree files which
describes the SoC and the BCM958625 implementation.  The perpherials
described are:

ARM Cortex A9 CPU
2 8250 UARTs
ARM GIC
PL310 L2 Cache
ARM A9 Global timer

Signed-off-by: Jon Mason <redacted>
Signed-off-by: Kapil Hali <redacted>
Reviewed-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>

Seeing reviewed-by already attached to a v1 of a patchset has limited
value for someone on the outside.

Reviewed-by is one of those tags that has a value that's mostly
dependent on who it comes from. By not actually seeing the review and
the feedback provided (and revisions made), less data is provided to
tell if it's a valuable review or not.

Also, if you're posting the code you should probably have your name
below Kapil's, since you're the one signing off the origin of the
code. See Documentation/SubmittingPatches.txt for details on what
S-o-b actually means.

We worked on it together, but I'll be happy to reorder as you suggest.

quoted

--- /dev/null
+++ b/arch/arm/boot/dts/bcm-nsp.dtsi

@@ -0,0 +1,105 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */

I'm not sure we've seen BSD-only submissions before. I'll let DT
maintainers (or Ian) speak up in case this would cause problems.

I was following the precedent in arch/arm/boot/dts/bcm-cygnus.dtsi.
If this is preferred to be GPL v2, then I will happily comply.

quoted

+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+#include "skeleton.dtsi"
+
+/ {
+       compatible = "brcm,nsp";
+       model = "Broadcom Northstar Plus SoC";
+       interrupt-parent = <&gic>;
+
+       cpus {
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               cpu at 0 {
+                       device_type = "cpu";
+                       compatible = "arm,cortex-a9";
+                       next-level-cache = <&L2>;
+                       reg = <0x0>;
+               };
+       };
+
+       clocks {
+               #address-cells = <1>;
+               #size-cells = <1>;
+               ranges;
+
+               periph_clk: periph_clk {
+                       compatible = "fixed-clock";
+                       #clock-cells = <0>;
+                       clock-frequency = <500000000>;
+               };
+       };
+
+       uart0: serial at 18000300 {
+               compatible = "ns16550a";
+               reg = <0x18000300 0x100>;
+               interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
+               clock-frequency = <62499840>;
+               status = "disabled";
+       };
+
+       uart1: serial at 18000400 {
+               compatible = "ns16550a";
+               reg = <0x18000400 0x100>;
+               interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
+               clock-frequency = <62499840>;
+               status = "disabled";
+       };
+
+       gic: interrupt-controller at 19021000 {
+               compatible = "arm,cortex-a9-gic";
+               #interrupt-cells = <3>;
+               #address-cells = <0>;
+               interrupt-controller;
+               reg = <0x19021000 0x1000>,
+                     <0x19020100 0x100>;
+       };
+
+       L2: l2-cache {
+               compatible = "arm,pl310-cache";
+               reg = <0x19022000 0x1000>;
+               cache-unified;
+               cache-level = <2>;
+       };
+
+       timer at 19020200 {
+               compatible = "arm,cortex-a9-global-timer";
+               reg = <0x19020200 0x100>;
+               interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
+               clocks = <&periph_clk>;
+       };
+};

diff --git a/arch/arm/boot/dts/bcm958625k.dts b/arch/arm/boot/dts/bcm958625k.dts
new file mode 100644
index 0000000..a1bc151
--- /dev/null
+++ b/arch/arm/boot/dts/bcm958625k.dts

@@ -0,0 +1,57 @@
+/*
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2015 Broadcom Corporation.  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Broadcom Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/dts-v1/;
+
+#include "bcm-nsp.dtsi"
+
+/ {
+       model = "NorthStar Plus SVK (BCM958625K)";
+       compatible = "brcm,bcm58625", "brcm,nsp";
+
+       aliases {
+               serial0 = &uart0;
+               serial1 = &uart1;
+       };
+
+       chosen {
+               stdout-path = "serial0:115200n8";
+       };

No way to mount a root filesystem yet? How much work remains for that
to be possible, and what's the plan for that?

It mounts rootfs.  I am adding the rootfs to the kernel and device
tree blob via the u-boot mkimage command.  It boots all the way to
shell without issue.

quoted

+
+       uart0: serial at 18000300 {
+               status = "okay";
+       };
+
+       uart1: serial at 18000400 {
+               status = "okay";
+       };

I recommend using labels here instead so you don't have to mirror the
DT layout to get the updated property right.

Agreed.

Thanks,
Jon

I.e.

&uart1 {
        status = "okay";
};



-Olof