linux-kernel - Re: [PATCH v3 1/3] powerpc/512x: add LocalPlus Bus FIFO device driver

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Date:	Thu, 1 Oct 2015 12:11:10 -0500
From:	Timur Tabi <timur@...i.org>
To:	alex.popov@...ux.com,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Anatolij Gustschin <agust@...x.de>,
	Rob Herring <robh@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linuxppc-dev@...ts.ozlabs.org, dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] powerpc/512x: add LocalPlus Bus FIFO device driver

On 09/30/2015 04:24 PM, Alexander Popov wrote:

>> Can you test for "!cs" here instead?
>>
>>> +        e = -EFAULT;
>>> +        goto err_param;
>>> +    }
>
> Unfortunately no: 0 is a valid value for Chip Select.
> Is it OK to leave it like that?

Yes.

>>> +    lpbfifo.ram_bus_addr = sg_dma_address(&sg); /* For freeing later */
>>> +    sg_dma_len(&sg) = lpbfifo.req->size;
>>
>> I don't think sg_dma_len() is meant to be used as an lvalue.
>
> I've double-checked and found many cases of such usage of this macro.
> It seems that I can't avoid it too.

Ok.

>> Driver code that has to parse #address-cells or #size-cells
>> is usually wrong.
>
> I would not call it "parsing", I just check whether the dts-file is good.
> Anyway, could you give me a clue how to do better?

You should use of_n_size_cells() and of_n_addr_cells().

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