linux-kernel - Re: [PATCH v1 3/3] ARM64 LPC: update binding doc

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Date:	Wed, 13 Jan 2016 14:34:47 +0800
From:	Rongrong Zou <zourongrong@...il.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Arnd Bergmann <arnd@...db.de>, liviu.dudau@....com
Cc:	Rongrong Zou <zourongrong@...wei.com>, devicetree@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Corey Minyard <minyard@....org>, gregkh@...uxfoundation.org,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, linuxarm@...wei.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 3/3] ARM64 LPC: update binding doc

On 2016/1/13 13:53, Benjamin Herrenschmidt wrote:
> On Tue, 2016-01-12 at 23:52 +0100, Arnd Bergmann wrote:
>> On Tuesday 12 January 2016 15:13:35 liviu.dudau@....com wrote:
>>>> int of_address_to_resource(struct device_node *dev, int index,
>>>>                            struct resource *r)
>>>> {
>>>>         ...
>>>>         /* flags can be get here, without ranges property reqired.
>>>>          * if the reg = <0x0 0xe4 4>, I can get flag of
>> IORESOURCE_MEM,
>>>>          * if the reg = <0x1 0xe4 4>, I can get flag of
>> IORESOURCE_IO,
>>>
>>> That is strange, the parent node has #address-cells = <2> so the
>> first two numbers should be part
>>> of the address and not influence the flags. Can you add some
>> debugging in of_get_address() and
>>> try to figure out what bus is used in  *flags = bus-
>>> get_flags(prop) ?
>>>
>>>
>>
>> This is the standard ISA binding. The first cell is the address space
>> (IO or MEM), the second cell is the address within that space. This
>> is similar to how PCI works.
>
> Picking up that mid-way, I have LPC busses on power and am using a
> similar binding. I'll try to grab some examples and review the
> document tomorrow (only just noticed it while unpiling emails post-
> vacation).

Hi Ben,
Thanks for reviewing this, I found a similar implementation at arch/powerpc/
platform/powernv/opal-lpc.c and I had get some ideas from your work. It is
nice to me. I'm expecting your suggestion.Thanks in advance.

>
> Cheers,
> Ben.
>
Regards,
Rongrong