From: Alexander Popov <alex.popov@linux.com>
To: Timur Tabi <timur@tabi.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Anatolij Gustschin <agust@denx.de>, Rob Herring <robh@kernel.org>,
Grant Likely <grant.likely@linaro.org>,
Dan Williams <dan.j.williams@intel.com>,
Vinod Koul <vinod.koul@intel.com>,
Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
linuxppc-dev@lists.ozlabs.org, dmaengine@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Alexander Popov <alex.popov@linux.com>
Subject: Re: [PATCH v3 1/3] powerpc/512x: add LocalPlus Bus FIFO device driver
Date: Tue, 6 Oct 2015 01:22:42 +0300 [thread overview]
Message-ID: <5612F832.9060407@linux.com> (raw)
In-Reply-To: <560D692E.1010309@tabi.org>
On 01.10.2015 20:11, Timur Tabi wrote:
> On 09/30/2015 04:24 PM, Alexander Popov wrote:
>>> 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().
It seems that of_n_size_cells() and of_n_addr_cells() don't work well in
my case. These functions just help to get "#address-cells" and "#size-cells"
from a parent node of a given node.
"sclpc" device tree node is a child of "soc" node (not "localbus" node),
but the driver must use "ranges" property of "localbus" to determine
the chip select number of a client device which ordered the DMA transfer.
It seems that ns2_leds_get_of_pdata() from linux/drivers/leds/leds-ns2.c
or pnv_init_idle_states() from arch/powerpc/platforms/powernv/idle.c do
something similar to get_cs_ranges().
Is it OK?
Best regards,
Alexander
next prev parent reply other threads:[~2015-10-05 22:19 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-24 17:28 [PATCH v3 0/3] powerpc/512x: add LocalPlus Bus FIFO device driver Alexander Popov
2015-09-24 17:28 ` Alexander Popov
2015-09-24 17:28 ` [PATCH v3 1/3] " Alexander Popov
2015-09-25 1:01 ` Timur Tabi
2015-09-25 1:01 ` Timur Tabi
2015-09-28 13:13 ` Alexander Popov
2015-09-28 13:13 ` Alexander Popov
2015-09-28 13:18 ` Timur Tabi
2015-09-28 13:18 ` Timur Tabi
2015-09-29 6:34 ` Alexander Popov
2015-09-29 6:34 ` Alexander Popov
2015-09-30 21:24 ` Alexander Popov
2015-10-01 17:11 ` Timur Tabi
2015-10-01 17:11 ` Timur Tabi
2015-10-05 22:22 ` Alexander Popov [this message]
2015-09-24 17:28 ` [PATCH v3 2/3] powerpc/512x: add a device tree binding for LocalPlus Bus FIFO Alexander Popov
2015-09-25 0:18 ` Timur Tabi
2015-09-28 13:24 ` Alexander Popov
2015-09-28 13:26 ` Timur Tabi
2015-09-28 13:26 ` Timur Tabi
2015-09-29 6:35 ` Alexander Popov
2015-09-29 6:35 ` Alexander Popov
2015-09-24 17:28 ` [PATCH v3 3/3] dmaengine: mpc512x: initialize with subsys_initcall() Alexander Popov
2015-09-25 0:16 ` Timur Tabi
2015-09-28 13:15 ` Alexander Popov
2015-10-07 14:17 ` Vinod Koul
2015-10-07 14:17 ` Vinod Koul
2015-10-07 21:31 ` Alexander Popov
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