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Message-ID: <20151119154810.GC23560@broadcom.com>
Date: Thu, 19 Nov 2015 10:48:10 -0500
From: Jon Mason <jonmason@...adcom.com>
To: Ray Jui <rjui@...adcom.com>
CC: Florian Fainelli <f.fainelli@...il.com>,
Hauke Mehrtens <hauke@...ke-m.de>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
"Russell King" <linux@....linux.org.uk>,
<devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>,
<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH 2/3] ARM: dts: enable clock support for Broadcom NSP
On Wed, Nov 18, 2015 at 03:57:36PM -0800, Ray Jui wrote:
> Would this patch merge properly with the other NSP DT clean up patch
> + I2C DT patch that you worked out internally but have not sent out?
>
> I thought it's going to make the maintainers' life easier if you can
> group DT changes per platform and send them out in the same series.
>
> I also have some inline comments below.
>
> On 11/18/2015 3:13 PM, Jon Mason wrote:
> >Replace current device tree dummy clocks with real clock support for
> >Broadcom Northstar Plus SoC
> >
> >Signed-off-by: Jon Mason <jonmason@...adcom.com>
> >---
> > arch/arm/boot/dts/bcm-nsp.dtsi | 99 ++++++++++++++++++++++++++++++++----------
> > 1 file changed, 75 insertions(+), 24 deletions(-)
> >
> >diff --git a/arch/arm/boot/dts/bcm-nsp.dtsi b/arch/arm/boot/dts/bcm-nsp.dtsi
> >index 4bcdd28..f85a4f1 100644
> >--- a/arch/arm/boot/dts/bcm-nsp.dtsi
> >+++ b/arch/arm/boot/dts/bcm-nsp.dtsi
> >@@ -32,6 +32,7 @@
> >
> > #include <dt-bindings/interrupt-controller/arm-gic.h>
> > #include <dt-bindings/interrupt-controller/irq.h>
> >+#include <dt-bindings/clock/bcm-nsp.h>
> >
> > #include "skeleton.dtsi"
> >
> >@@ -42,7 +43,7 @@
> >
> > mpcore {
> > compatible = "simple-bus";
> >- ranges = <0x00000000 0x19020000 0x00003000>;
> >+ ranges = <0x00000000 0x19000000 0x00023000>;
>
> Why does this have anything to do with clocks? Shouldn't it be a
> separate patch?
No, this is correct (though the patch is a little odd to look at).
The a9pll starts at 0x19000000 instead of 0x19020000. So, everything
needs to be adjusted.
>
> > #address-cells = <1>;
> > #size-cells = <1>;
> >
> >@@ -58,32 +59,23 @@
> > };
> > };
> >
> >- L2: l2-cache {
> >- compatible = "arm,pl310-cache";
> >- reg = <0x2000 0x1000>;
> >- cache-unified;
> >- cache-level = <2>;
> >- };
> >-
> >- gic: interrupt-controller@...21000 {
> >- compatible = "arm,cortex-a9-gic";
> >- #interrupt-cells = <3>;
> >- #address-cells = <0>;
> >- interrupt-controller;
> >- reg = <0x1000 0x1000>,
> >- <0x0100 0x100>;
> >+ a9pll: arm_clk@...00000 {
> >+ #clock-cells = <0>;
> >+ compatible = "brcm,nsp-armpll";
> >+ clocks = <&osc>;
> >+ reg = <0x00000 0x1000>;
> > };
> >
> > timer@...20200 {
> > compatible = "arm,cortex-a9-global-timer";
> >- reg = <0x0200 0x100>;
> >+ reg = <0x20200 0x100>;
> > interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
> > clocks = <&periph_clk>;
> > };
> >
> > twd-timer@...20600 {
> > compatible = "arm,cortex-a9-twd-timer";
> >- reg = <0x0600 0x20>;
> >+ reg = <0x20600 0x20>;
> > interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(2) |
> > IRQ_TYPE_LEVEL_HIGH)>;
> > clocks = <&periph_clk>;
> >@@ -91,11 +83,27 @@
> >
> > twd-watchdog@...20620 {
> > compatible = "arm,cortex-a9-twd-wdt";
> >- reg = <0x0620 0x20>;
> >+ reg = <0x20620 0x20>;
> > interrupts = <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(2) |
> > IRQ_TYPE_LEVEL_HIGH)>;
> > clocks = <&periph_clk>;
> > };
> >+
> >+ gic: interrupt-controller@...21000 {
> >+ compatible = "arm,cortex-a9-gic";
> >+ #interrupt-cells = <3>;
> >+ #address-cells = <0>;
> >+ interrupt-controller;
> >+ reg = <0x21000 0x1000>,
> >+ <0x20100 0x100>;
> >+ };
> >+
> >+ L2: l2-cache {
> >+ compatible = "arm,pl310-cache";
> >+ reg = <0x22000 0x1000>;
> >+ cache-unified;
> >+ cache-level = <2>;
> >+ };
>
> From here and above, all labels are wrong. You are moving them into
> a bus that has translated bus addresses, but you still use absolute
> addresses for all labels.
>
> And again, 1) Why is this change imbedded in a patch meant for
> adding DT clock support according to the commit message; 2) how does
> the dependency work with the other patches that you are about to
> send out?
This was already discussed in the original series. See
http://www.spinics.net/lists/arm-kernel/msg451580.html
>
>
> > };
> >
> > clocks {
> >@@ -103,10 +111,34 @@
> > #size-cells = <1>;
> > ranges;
> >
> >- periph_clk: periph_clk {
> >+ osc: oscillator {
> >+ #clock-cells = <0>;
> > compatible = "fixed-clock";
> >+ clock-frequency = <25000000>;
> >+ };
> >+
> >+ iprocmed: iprocmed {
> >+ #clock-cells = <0>;
> >+ compatible = "fixed-factor-clock";
> >+ clocks = <&genpll BCM_NSP_GENPLL_IPROCFAST_CLK>;
> >+ clock-div = <2>;
> >+ clock-mult = <1>;
> >+ };
> >+
> >+ iprocslow: iprocslow {
> >+ #clock-cells = <0>;
> >+ compatible = "fixed-factor-clock";
> >+ clocks = <&genpll BCM_NSP_GENPLL_IPROCFAST_CLK>;
> >+ clock-div = <4>;
> >+ clock-mult = <1>;
> >+ };
> >+
> >+ periph_clk: periph_clk {
> > #clock-cells = <0>;
> >- clock-frequency = <500000000>;
> >+ compatible = "fixed-factor-clock";
> >+ clocks = <&a9pll>;
> >+ clock-div = <2>;
> >+ clock-mult = <1>;
> > };
> > };
> >
> >@@ -118,17 +150,17 @@
> >
> > uart0: serial@...00300 {
> > compatible = "ns16550a";
> >- reg = <0x0300 0x100>;
> >+ reg = <0x000300 0x100>;
> > interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
> >- clock-frequency = <62499840>;
> >+ clocks = <&osc>;
> > status = "disabled";
> > };
> >
> > uart1: serial@...00400 {
> > compatible = "ns16550a";
> >- reg = <0x0400 0x100>;
> >+ reg = <0x000400 0x100>;
> > interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
> >- clock-frequency = <62499840>;
> >+ clocks = <&osc>;
> > status = "disabled";
> > };
> >
> >@@ -217,5 +249,24 @@
> >
> > brcm,nand-has-wp;
> > };
> >+
> >+ lcpll0: lcpll0@...3f100 {
>
> wrong label
>
> >+ #clock-cells = <1>;
> >+ compatible = "brcm,nsp-lcpll0";
> >+ reg = <0x03f100 0x14>;
> >+ clocks = <&osc>;
> >+ clock-output-names = "lcpll0", "pcie_phy", "sdio",
> >+ "ddr_phy";
> >+ };
> >+
> >+ genpll: genpll@...3f140 {
>
> wrong label
>
> >+ #clock-cells = <1>;
> >+ compatible = "brcm,nsp-genpll";
> >+ reg = <0x03f140 0x24>;
> >+ clocks = <&osc>;
> >+ clock-output-names = "genpll", "phy", "ethernetclk",
> >+ "usbclk", "iprocfast", "sata1",
> >+ "sata2";
> >+ };
> > };
> > };
> >
--
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