linux-kernel - Re: [PATCH V4] arm64: amd-seattle: Adding device tree for AMD Seattle platform

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Date:	Thu, 27 Nov 2014 14:45:26 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Liviu Dudau <Liviu.Dudau@....com>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>
CC:	"arnd@...db.de" <arnd@...db.de>,
	Mark Rutland <Mark.Rutland@....com>,
	Will Deacon <Will.Deacon@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"robherring2@...il.com" <robherring2@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arm@...nel.org" <arm@...nel.org>,
	"Lendacky, Thomas" <Thomas.Lendacky@....com>,
	"Schopp, Joel" <Joel.Schopp@....com>
Subject: Re: [PATCH V4] arm64: amd-seattle: Adding device tree for AMD Seattle
 platform

On 27/11/14 14:28, Liviu Dudau wrote:
> On Tue, Nov 25, 2014 at 11:46:50AM +0000, Suthikulpanit, Suravee wrote:
>> Hi Marc,
>>
>> On 11/25/14, 17:23, "Marc Zyngier" <marc.zyngier@....com> wrote:
>>
>>> Hi Suravee,
>>>
>>> Just spotted a small issue below (looks like a recurring mistake in a
>>> number of DTs I've seem lately):
>>>
>>> On 24/11/14 21:51, suravee.suthikulpanit@....com wrote:
>>>> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>>>>
>>>> Initial revision of device tree for AMD Seattle platform.
>>>>
>>>> Cc: Arnd Bergmann <arnd@...db.de>
>>>> Cc: Marc Zyngier <marc.zyngier@....com>
>>>> Cc: Mark Rutland <mark.rutland@....com>
>>>> Cc: Will Deacon <will.deacon@....com>
>>>> Cc: Catalin Marinas <catalin.marinas@....com>
>>>> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>>>> Signed-off-by: Thomas Lendacky <Thomas.Lendacky@....com>
>>>> Signed-off-by: Joel Schopp <Joel.Schopp@....com>
>>>> ---
>>>> V4 Changes:
>>>>     * Remove unnecessary smb layer and move motherbord to top level
>>>>     * Move include dtsi to top level
>>>>     * Remove apb_pclk from sata0 and i2c
>>>>     * Fix GIC Virtual Maintanance Interrupt from PPI24 (8) to PPI25 (9)
>>>>     * Add 40-bit dma-ranges for motherboard (simple-bus)
>>>>     * Remove dma0 (pl330) entry for now since it only supports 32-bit
>>>> DMA.
>>>>       It is basically not used at the moment. It would also need SMMU
>>>>       to allow dma remapping to 40-bit DMA range.
>>>>     * Add phandle spi0 and spi1
>>>>     * Hook up gpio0 pin 7 with MMC Card Detection (CD) support.
>>>>     * Changes in pcie0 entry:
>>>>         - Add 40-bit dma-ranges
>>>>         - Remove interrupts property
>>>>         - Add interrupt-map/mask property
>>>>         - Fix PCI I/O range
>>>>         - Merge PCI 32-bit ranges
>>>>         - Merge PCI 64-bit ranges
>>>>
>>>> NOTE: I am not add a new compatible ID for the sata0 as Rob Herring
>>>>       suggested since there is no need at the momement, and I am trying
>>>>       to avoid introducing ID unnecessarily.
>>>>
>>>>  arch/arm64/Kconfig                          |   5 +
>>>>  arch/arm64/boot/dts/Makefile                |   1 +
>>>>  arch/arm64/boot/dts/amd-seattle-periph.dtsi | 156
>>>> ++++++++++++++++++++++++++++
>>>>  arch/arm64/boot/dts/amd-seattle.dts         |  89 ++++++++++++++++
>>>>  4 files changed, 251 insertions(+)
>>>>  create mode 100644 arch/arm64/boot/dts/amd-seattle-periph.dtsi
>>>>  create mode 100644 arch/arm64/boot/dts/amd-seattle.dts
>>>>
>>>
>>> [...]
>>>
>>>> diff --git a/arch/arm64/boot/dts/amd-seattle.dts
>>>> b/arch/arm64/boot/dts/amd-seattle.dts
>>>> new file mode 100644
>>>> index 0000000..d5fc482
>>>> --- /dev/null
>>>> +++ b/arch/arm64/boot/dts/amd-seattle.dts
>>>> @@ -0,0 +1,89 @@
>>>> +/*
>>>> + * DTS file for AMD Seattle
>>>> + *
>>>> + * Copyright (C) 2014 Advanced Micro Devices, Inc.
>>>> + */
>>>> +
>>>> +/dts-v1/;
>>>> +
>>
>> [...] 
>>
>>>> +
>>>> +	timer {
>>>> +		compatible = "arm,armv8-timer";
>>>> +		interrupts = <1 13 0xff01>,
>>>> +			     <1 14 0xff01>,
>>>> +			     <1 11 0xff01>,
>>>> +			     <1 10 0xff01>;
>>>> +	};
>>>
>>> The Cortex-A57 TRM clearly states that these interrupts are level
>>> triggered.
>>
>> Thanks for pointing this out. I¹ll fix this to <1 1X 0xff04> (4 for the
>> Active-High) then.
> 
> Hi Suravee,
> 
> Don't know what Seattle does, but the TRM says that the outputs are active-LOW.

As I said in another thread, 0xff04 *is* the right value. This is an
interrupt descriptor for the GIC, not a qualifier for the signal that
comes out of the core.

Thanks.

	M.
-- 
Jazz is not dead. It just smells funny...
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