netdev - Re: [PATCH v6] net: sh_eth: Add support of device tree probe

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Date:	Wed, 17 Apr 2013 16:54:02 +0900
From:	Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	netdev@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	magnus.damm@...il.com, kda@...ux-powerpc.org,
	horms+renesas@...ge.net.au, mark.rutland@....com,
	grant.likely@...retlab.ca
Subject: Re: [PATCH v6] net: sh_eth: Add support of device tree probe

Hi,

(2013/04/16 3:52), Sergei Shtylyov wrote:
> Hello.
>
> On 15-04-2013 6:17, Nobuhiro Iwamatsu wrote:
>
>>>>>> This adds support of device tree probe for Renesas sh-ether driver.
>
>>>>>> Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
>
>>>>>> V6: - Add renesas,sh-eth-gigabit, renesas,sh-eth-sh4 and
>>>>>> renesas,sh-eth-sh3-sh2 to compatible string.
>>>>>> - Remove sh-eth,register-type. This is supplemented by the
>>>>>> compatible string.
>>>>>> - Use the of_property_read_bool instead of of_find_property.
>>>>>> - Add sanity chheck for of_property_read_u32.
>>>>>> - Update document.
>>>>>> V5: - Rewrite sh_eth_parse_dt().
>>>>>> Remove of_device_is_available() and CONFIG_OF from support OF
>>>>>> checking function and re-add empty sh_eth_parse_dt().
>>>>>> - Add CONFIG_PM to definition of dev_pm_ops.
>>>>>> - Add CONFIG_OF to definition of of_device_id.
>>>>>> V4: - Remove empty sh_eth_parse_dt().
>>>>>> V3: - Remove empty sh_eth_parse_dt().
>>>>>> V3: - Removed sentnece of "needs-init" from document.
>>>>>> V2: - Removed ether_setup().
>>>>>> - Fixed typo from "sh-etn" to "sh-eth".
>>>>>> - Removed "needs-init" and sh-eth,endian from definition of DT.
>>>>>> - Changed "sh-eth,edmac-endian" instead of "sh-eth,edmac-big-endain"
>>>>>> in definition of DT.
>>>>>> ---
>>> [...]
>
>>>>>> @@ -2391,12 +2451,33 @@ static int sh_eth_drv_probe(struct platform_device
>>>>>> *pdev)
>>>>>> goto out_release;
>>>>>> }
>>>>>>
>>>>>> + if (np) {
>>>>>> + pd = sh_eth_parse_dt(&pdev->dev, ndev, np);
>>>>>> + if (pdev->dev.platform_data && pd) {
>>>>>> + struct sh_eth_plat_data *tmp =
>>>>>> + pdev->dev.platform_data;
>>>>>> + pd->set_mdio_gate = tmp->set_mdio_gate;
>>>>>> + pd->needs_init = tmp->needs_init;
>
>>>>> OK, so we can't fully convert this driver to the device tree due to
>>>>> procedural platform data.
>
>>>> > I then would advice just using OF_DEV_AUXDATA() in the platform data
>
>>> /sdata/code/.
>
>>>> instead of trying to convert the driver to device tree.
>
>>> Convert the platfrom data, I meant. But I already wrote about that I think.
>
>>>> Yes, I knew about this.
>
>>> But still attempted to document and use the data-only device tree properties
>>> (which was pointless in the light of procediral platfrom data)?
>
>> Yes, I added this information to next patch.
>
> WHich information, I didn't understand?

sorry, I was not understand your mail by mistake.
You believe that without OF_DEV_AUXDATA, that it should be fully migrated to the DT from platformdata. right?

>
>>>>>> +
>>>>>> +#ifdef CONFIG_OF
>>>>>> +static const struct of_device_id sh_eth_match[] = {
>>>>>> + { .compatible = "renesas,sh-eth-gigabit", },
>>>>>> + { .compatible = "renesas,sh-eth-sh4", },
>>>>>> + { .compatible = "renesas,sh-eth-sh3-sh2", },
>
>>>> Therefore, the compatible property of this device becomes <CPU>-sh-eth
>>>> or <CPU>-sh-eth-<ETHER TYPE>.
>
>>>> How about this?
>
>>> Sounds better. I think however that the conversion of this driver to device
>>> tree shouldn't be done without getting rid of the current #ifdef mess in it
>>> (which is still on my agenda). I think that the 'register_type' field should
>>> move from the platform data to the 'struct sh_eth_cpu_data' in the process.
>
>> I see. this problem will fix next step, I think.
>
> No, not at all. If we don't get rid of the #ifdef mess, adding device tree support will have to add even more of it.
>

But sh-eth was used by SH and sh-mobile.
I think we can migrate to DT.
However, I think it is not possible to remove idfef completely immediately.

>> Best regards,
>> Nobuhiro
>
> WBR, Sergei
>
>

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