linux-kernel - Re: [PATCH v2 05/11] ARM: dts: zynq: Add QSPI for Parallella

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Date:	Fri, 25 Jul 2014 11:38:19 +0200
From:	Michal Simek <michal.simek@...inx.com>
To:	Andreas Färber <afaerber@...e.de>,
	<monstr@...str.eu>,
	Sören Brinkmann <soren.brinkmann@...inx.com>
CC:	Harini Katakam <harinik@...inx.com>,
	Michal Simek <michal.simek@...inx.com>,
	Andreas Olofsson <andreas@...pteva.com>,
	Matteo Vit <matteo.vit@...rwaredesign.com>,
	Sean Rickerd <srickerd@...e.com>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, 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>
Subject: Re: [PATCH v2 05/11] ARM: dts: zynq: Add QSPI for Parallella

On 07/25/2014 10:42 AM, Andreas Färber wrote:
> Am 25.07.2014 09:59, schrieb Michal Simek:
>> On 07/25/2014 01:18 AM, Sören Brinkmann wrote:
>>> On Fri, 2014-07-25 at 01:00AM +0200, Andreas Färber wrote:
>>>> Prepare SPI0 and SPI1 while at it.
> 
>> Patch subject is incorrect. You are adding SPI and QSPI.
> 
> Yes, it originally added only QSPI, but I considered it a good deed to
> add SPI as well while already reading that part of the TRM. :)
> 
>>>>
>>>> Signed-off-by: Andreas Färber <afaerber@...e.de> --- v2: New
>>>>
>>>> arch/arm/boot/dts/zynq-7000.dtsi      | 37
>>>> +++++++++++++++++++++++++++++++++++ 
>>>> arch/arm/boot/dts/zynq-parallella.dts |  4 ++++ 2 files
>>>> changed, 41 insertions(+)
>>>>
>>>> diff --git a/arch/arm/boot/dts/zynq-7000.dtsi
>>>> b/arch/arm/boot/dts/zynq-7000.dtsi index 8fd826a..eed3df0
>>>> 100644 --- a/arch/arm/boot/dts/zynq-7000.dtsi +++
>>>> b/arch/arm/boot/dts/zynq-7000.dtsi @@ -122,6 +122,30 @@ 
>>>> interrupts = <0 50 4>; };
>>>>
>>>> +		spi0: spi@...06000 { +			compatible = "xlnx,zynq-spi-r1p6"; 
>>>> +			reg = <0xe0006000 0x1000>; +			status = "disabled"; +
>>>> interrupt-parent = <&intc>; +			interrupts = <0 26 4>; +
>>>> clocks = <&clkc 25>, <&clkc 34>; +			clock-names = "ref_clk",
>>>> "pclk"; +			#address-cells = <1>; +			#size-cells = <0>; +		}; 
>>>> + +		spi1: spi@...07000 { +			compatible =
>>>> "xlnx,zynq-spi-r1p6"; +			reg = <0xe0007000 0x1000>; +			status
>>>> = "disabled"; +			interrupt-parent = <&intc>; +			interrupts =
>>>> <0 49 4>; +			clocks = <&clkc 26>, <&clkc 35>; +			clock-names
>>>> = "ref_clk", "pclk"; +			#address-cells = <1>; +			#size-cells
>>>> = <0>; +		}; +
>>> Until here things look good.
>>>
>>>> gem0: ethernet@...0b000 { compatible = "cdns,gem"; reg =
>>>> <0xe000b000 0x4000>; @@ -140,6 +164,19 @@ clock-names = "pclk",
>>>> "hclk", "tx_clk"; };
>>>>
>>>> +		qspi: qspi@...0d000 { +			compatible =
>>>> "xlnx,zynq-spi-r1p6"; +			reg = <0xe000d000 0x1000>; +			status
>>>> = "disabled"; +			interrupt-parent = <&intc>; +			interrupts =
>>>> <0 19 4>; +			clocks = <&clkc 10>, <&clkc 43>; +			clock-names
>>>> = "ref_clk", "pclk"; +			num-cs = <1>; +			#address-cells =
>>>> <1>; +			#size-cells = <0>; +		}; +
>>> I'm not sure what the status of this driver is. I think QSPI is
>>> still under review on the mailing lists and I don't think we
>>> should add this yet.
> 
>> Driver for qspi is not in the mainline yet but it doesn't mean that
>> this fragment won't work. Harini: Can you please correct me if I am
>> wrong?
> 
> It did seem to find the flash chip (cf. parallella-next branch), but I
> didn't find a driver capable of handling its ID. The downstream tree
> was using m25p80; I tried both micron,n25q128a11 and ...a13 based on
> U-Boot output.
> 
>> I would prefer to send two separate patches.
> 
> Will do.
> 
>> 1. just add SPI to zynq
> 
> As I don't have any of the other Zynq boards, can you please advise
> whether either of them should be enabled for some board?

we don't have them enabled for any board in default configuration
that's why just adding nodes with status = "disabled" is fine.

Thanks,
Michal


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