linux-kernel - Re: [PATCH v3 02/10] dt-bindings: hisi: Add Hisilicon HiP05/06/07 Djtag dts bindings

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Date:   Tue, 10 Jan 2017 17:45:15 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Anurup M <anurupvasu@...il.com>
Cc:     Rob Herring <robh@...nel.org>, will.deacon@....com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, anurup.m@...wei.com,
        zhangshaokun@...ilicon.com, tanxiaojun@...wei.com,
        xuwei5@...ilicon.com, sanil.kumar@...ilicon.com,
        john.garry@...wei.com, gabriele.paoloni@...wei.com,
        shiju.jose@...wei.com, wangkefeng.wang@...wei.com,
        linuxarm@...wei.com, shyju.pv@...wei.com
Subject: Re: [PATCH v3 02/10] dt-bindings: hisi: Add Hisilicon HiP05/06/07
 Djtag dts bindings

On Thu, Jan 05, 2017 at 10:28:54AM +0530, Anurup M wrote:
> 
> 
> On Wednesday 04 January 2017 04:26 AM, Rob Herring wrote:
> >On Mon, Jan 02, 2017 at 01:49:03AM -0500, Anurup M wrote:
> >>From: Tan Xiaojun <tanxiaojun@...wei.com>
> >>
> >>Add Hisilicon HiP05/06/07 Djtag dts bindings for CPU and IO Die
> >>
> >>Signed-off-by: Tan Xiaojun <tanxiaojun@...wei.com>
> >>Signed-off-by: Anurup M <anurup.m@...wei.com>
> >>---
> >>  .../devicetree/bindings/arm/hisilicon/djtag.txt    | 41 ++++++++++++++++++++++
> >>  1 file changed, 41 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/arm/hisilicon/djtag.txt
> >>
> >>diff --git a/Documentation/devicetree/bindings/arm/hisilicon/djtag.txt b/Documentation/devicetree/bindings/arm/hisilicon/djtag.txt
> >>new file mode 100644
> >>index 0000000..bbe8b45
> >>--- /dev/null
> >>+++ b/Documentation/devicetree/bindings/arm/hisilicon/djtag.txt
> >>@@ -0,0 +1,41 @@
> >>+The Hisilicon Djtag is an independent component which connects with some other
> >>+components in the SoC by Debug Bus. The djtag is available in CPU and IO dies
> >>+in the chip. The djtag controls access to connecting modules of CPU and IO
> >>+dies.
> >>+The various connecting components in CPU die (like L3 cache, L3 cache PMU etc.)
> >>+are accessed by djtag during real time debugging. In IO die there are connecting
> >>+components like RSA. These components appear as devices attached to djtag bus.
> >>+
> >>+Hisilicon HiP05/06/07 djtag for CPU and IO die
> >>+Required properties:
> >>+  - compatible : The value should be as follows
> >>+	(a) "hisilicon,hip05-djtag-v1" for CPU and IO die which use v1 hw in
> >>+	    HiP05 chipset.
> >You don't need to distinguish the CPU and IO blocks?
> 
> The CPU and IO djtag nodes will have different base address(in reg
> property).
> There is no difference in handling of CPU and IO dies in the djtag driver.
> So there is currently no need to distinguish them.

It may still make sense to distinuguish them, even if the current djtag
driver can handle them the same. Presumably clients of the djtag driver
will poke CPU and IO djtag units differently.

Thanks,
Mark.