linux-kernel - Re: [PATCH v3 27/27] ARM: dts: omap3: Fix gpmc and NAND nodes

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Message-ID: <561E06A1.1020209@ti.com>
Date:	Wed, 14 Oct 2015 10:39:13 +0300
From:	Roger Quadros <rogerq@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	<dwmw2@...radead.org>, <computersforpeace@...il.com>,
	<ezequiel@...guardiasur.com.ar>, <javier@...hile0.org>,
	<fcooper@...com>, <nsekhar@...com>,
	<linux-mtd@...ts.infradead.org>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 27/27] ARM: dts: omap3: Fix gpmc and NAND nodes

Tony,

On 13/10/15 18:18, Tony Lindgren wrote:
> * Roger Quadros <rogerq@...com> [151012 23:33]:
>> On 13/10/15 03:43, Tony Lindgren wrote:
>>> * Roger Quadros <rogerq@...com> [150918 08:00]:
>>>> Add compatible id, GPMC register resource and interrupt
>>>> resource to NAND controller nodes.
>>>>
>>>> The GPMC driver now implements gpiochip and irqchip so
>>>> enable gpio-controller and interrupt-controller properties.
>>>>
>>>> With this the interrupt parent of NAND node changes so fix it
>>>> accordingly.
>>> ...
>>>> --- a/arch/arm/boot/dts/logicpd-torpedo-som.dtsi
>>>> +++ b/arch/arm/boot/dts/logicpd-torpedo-som.dtsi
>>>> @@ -35,11 +35,14 @@
>>>>  };
>>>>  
>>>>  &gpmc {
>>>> -	ranges = <0 0 0x00000000 0x1000000>;	/* CS0: 16MB for NAND */
>>>> +	ranges = <0 0 0x08000000 0x1000000>;	/* CS0: 16MB for NAND */
>>>>  
>>>>  	nand@0,0 {
>>>> -		linux,mtd-name = "micron,mt29f4g16abbda3w";
>>>> +		compatible = "ti,omap2-nand";
>>>>  		reg = <0 0 4>; /* CS0, offset 0, IO size 4 */
>>>> +		interrupt-parent = <&intc>;
>>>> +		interrupts = <20>;
>>>> +		linux,mtd-name = "micron,mt29f4g16abbda3w";
>>>>  		nand-bus-width = <16>;
>>>>  		ti,nand-ecc-opt = "bch8";
>>>>  		gpmc,sync-clk-ps = <0>;
>>>
>>> At least torpedo breaks for NFSroot as NAND now overlaps with
>>> Ethernet.. What's the policy you have for moving the addresses
>>> around?
>>
>> For OMAP3 I intended to use 0x30000000 for NAND but incorrectly
>> used 0x08000000 for the torpedo.
> 
> Might be worth adding some documentation of suggested standardized
> mappings.. For most of theme we could just add them as 16MB chunks,
> then reserve some larger area for NOR?

As GPMC peripherals are not plug and play the GPMC map is specific to
the board and need not necessarily apply to all boards.
So I don't think we need to have any standardized mappings.

> 
>> Does setting it to 0x30000000 work? If not what is the original
>> NAND address for this board?
> 
> The u-boot addresses are probably what were used in the .dts* files.
> Setting NAND to 0x30000000 is not enough though, looks like there's
> a bug where the logicpd-torpedo-37xx-devkit.dts ranges is missing
> the NAND range in logicpd-torpedo-som.dtsi. Something like the
> patch below seems to make things work again, might be worth
> checking what ranges make sense to standardize on though. Please
> feel free to fold it into your patches.

Thanks. I'll post a revised patch.

> 
>>> There may be other similar cases to check too.
>>
>> Just checked that all other OMAP3 boards I've set to 0x30000000
>> if they were 0x0.
> 
> Do you want to reserve a large chunk for NOR at cs0 or what's
> the reason for picking 0x30000000 for NAND?

All of the OMAP3 boards were using 0x30000000. Probably copy paste effect? :)
What's the point of reserving anything for NOR. If the board doesn't already
have NOR it never will. Future board having NOR can have its own GPMC map.
> 
> I guess NOR can be also on other chipselects.. Not sure we can
> standardize on any specific partition scheme?

Exactly.

cheers,
-roger

> 
> Regards,
> 
> Tony
> 
> 8< --------------------
> --- a/arch/arm/boot/dts/logicpd-torpedo-37xx-devkit.dts
> +++ b/arch/arm/boot/dts/logicpd-torpedo-37xx-devkit.dts
> @@ -73,7 +73,8 @@
>  };
>  
>  &gpmc {
> -	ranges = <1 0 0x08000000 0x1000000>;	/* CS1: 16MB for LAN9221 */
> +	ranges = <0 0 0x30000000 0x1000000	/* CS0: 16MB for NAND */
> +		  1 0 0x2c000000 0x1000000>;	/* CS1: 16MB for LAN9221 */
>  
>  	ethernet@...c {
>  		pinctrl-names = "default";
> --- a/arch/arm/boot/dts/logicpd-torpedo-som.dtsi
> +++ b/arch/arm/boot/dts/logicpd-torpedo-som.dtsi
> @@ -35,7 +35,7 @@
>  };
>  
>  &gpmc {
> -	ranges = <0 0 0x08000000 0x1000000>;	/* CS0: 16MB for NAND */
> +	ranges = <0 0 0x30000000 0x1000000>;	/* CS0: 16MB for NAND */
>  
>  	nand@0,0 {
>  		compatible = "ti,omap2-nand";
> 
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