linux-kernel - Re: [PATCH v2] ARM: berlin: add SPI nodes for BG2Q

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Message-ID: <556582D7.9040501@gmail.com>
Date:	Wed, 27 May 2015 10:39:51 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Antoine Tenart <antoine.tenart@...e-electrons.com>
CC:	zmxu@...vell.com, jszhang@...vell.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ARM: berlin: add SPI nodes for BG2Q

On 27.05.2015 10:33, Antoine Tenart wrote:
> On Wed, May 27, 2015 at 10:03:01AM +0200, Sebastian Hesselbarth wrote:
>> On 27.05.2015 09:59, Antoine Tenart wrote:
>>> The BG2Q SoC has two SPI controllers. Add the corresponding nodes.
>>>
>>> Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
>>> ---
>>>
>>> Changes since v1:
>>> 	- reworked the pinmux
>>> 	- removed useless interrupt-parent properties
>>> 	- typo
>>>
>>>   arch/arm/boot/dts/berlin2q.dtsi | 36 ++++++++++++++++++++++++++++++++++++
>>>   1 file changed, 36 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/berlin2q.dtsi b/arch/arm/boot/dts/berlin2q.dtsi
>>> index 187d056f7ad2..9f42ebfa50f2 100644
>>> --- a/arch/arm/boot/dts/berlin2q.dtsi
>>> +++ b/arch/arm/boot/dts/berlin2q.dtsi
>>> @@ -286,6 +286,19 @@
>>>   				status = "disabled";
>>>   			};
>>>
>>> +			spi0: spi@...0 {
>>> +				compatible = "snps,dw-apb-ssi";
>>> +				reg = <0x1c00 0x100>;
>>> +				interrupts = <7>;
>>> +				clocks = <&chip_clk CLKID_CFG>;
>>> +				pinctrl-0 = <&spi1_pmux>;
>>
>> Antoine,
>>
>> you missed s/spi0/spi1/ and the same for the node below?
>
> I think we had a misunderstanding then :) You would like to have spi1
> and spi2 nodes, without having an spi0 one?

Yes, sorry if I was unclear. I would have _preferred_ to start counting
with 0 _but_ pinctrl driver already uses spi{1,2} and if the DS also
suggests this numbering we should start with spi1.

In any way, match up the DT numbering with datasheet numbering.

>> BTW, you have any SPI device to test this? If you are brave
>> enough you could read the flash from the Berlin secure boot
>> SPI key ;)
>
> Until now, I tested it using spidev and connecting SDI to SDO.

Ok. I haven't checked in detail but except the optional SPI key,
there is no other SPI device on BG2Q DMP, right?

Sebastian

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