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

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Date:	Fri, 25 Jul 2014 10:42:47 +0200
From:	Andreas Färber <afaerber@...e.de>
To:	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

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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?

> 2. if Harini confirms that it is working I think that make sense to
> enable at least simple mode for qspi. That's why not a problem to
> add it too. It means qspi patch with enabling for your board as
> second patch.

Thanks,
Andreas

- -- 
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
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