linux-kernel - Re: [PATCH v2 4/6] ARM: davinci: da850: add DT node for eth0.

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Message-ID: <510FF4C8.7000706@ti.com>
Date:	Mon, 4 Feb 2013 23:20:00 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>, Heiko Schocher <hs@...x.de>,
	"Lad, Prabhakar" <prabhakar.lad@...com>
Subject: Re: [PATCH v2 4/6] ARM: davinci: da850: add DT node for eth0.

On 2/4/2013 10:37 AM, Prabhakar Lad wrote:
> Sekhar ,
> 
> On Sun, Feb 3, 2013 at 5:33 PM, Sekhar Nori <nsekhar@...com> wrote:
>> On 1/28/2013 7:17 PM, Prabhakar Lad wrote:
>>> From: Lad, Prabhakar <prabhakar.lad@...com>
>>>
>>> Add eth0 device tree node information and pinmux for mii to da850 by
>>> providing interrupt details and local mac address of eth0.
>>>
>>> Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
>>> Cc: linux-arm-kernel@...ts.infradead.org
>>> Cc: linux-kernel@...r.kernel.org
>>> Cc: davinci-linux-open-source@...ux.davincidsp.com
>>> Cc: netdev@...r.kernel.org
>>> Cc: devicetree-discuss@...ts.ozlabs.org
>>> Cc: Sekhar Nori <nsekhar@...com>
>>> Cc: Heiko Schocher <hs@...x.de>
>>> ---
>>>  arch/arm/boot/dts/da850-evm.dts |    5 +++++
>>>  arch/arm/boot/dts/da850.dtsi    |   35 +++++++++++++++++++++++++++++++++++
>>>  2 files changed, 40 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/arch/arm/boot/dts/da850-evm.dts b/arch/arm/boot/dts/da850-evm.dts
>>> index a319491..19aa2b3 100644
>>> --- a/arch/arm/boot/dts/da850-evm.dts
>>> +++ b/arch/arm/boot/dts/da850-evm.dts
>>> @@ -30,6 +30,11 @@
>>>               mdio: davinci_mdio@...4000 {
>>>                       status = "okay";
>>>               };
>>> +             eth0: emac@...0000 {
>>> +                     status = "okay";
>>> +                     pinctrl-names = "default";
>>> +                     pinctrl-0 = <&mii_pins>;
>>> +             };
>>>       };
>>>       nand_cs3@...00000 {
>>>               status = "okay";
>>> diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
>>> index ba28f2d..76905f3 100644
>>> --- a/arch/arm/boot/dts/da850.dtsi
>>> +++ b/arch/arm/boot/dts/da850.dtsi
>>> @@ -56,6 +56,26 @@
>>>                                       0x30 0x01100000  0x0ff00000
>>>                               >;
>>>                       };
>>> +                     mii_pins: pinmux_mii_pins {
>>> +                             pinctrl-single,bits = <
>>> +                                     /*
>>> +                                      * MII_TXEN, MII_TXCLK, MII_COL
>>> +                                      * MII_TXD_3, MII_TXD_2, MII_TXD_1
>>> +                                      * MII_TXD_0
>>> +                                      */
>>> +                                     0x8 0x88888880 0xfffffff0
>>> +                                     /*
>>> +                                      * MII_RXER, MII_CRS, MII_RXCLK
>>> +                                      * MII_RXDV, MII_RXD_3, MII_RXD_2
>>> +                                      * MII_RXD_1, MII_RXD_0
>>> +                                      */
>>> +                                     0xc 0x88888888 0xffffffff
>>> +                                     /* MDIO_CLK, MDIO_D */
>>
>> You call this mii_pins, but include mdio pins in there as well. Can you
>> separate them out? Then some board which uses rmii can simply reuse the
>> entry.
>>
> Ok makes sense.
> 
>>> +                                     0x10 0x00222288 0x00ffffff
>>> +                                     /* GPIO2_6 */
>>> +                                     0x18 0x00000080 0x000000f0
>>
>> This is SoC specific pin list. Such board specific pins should not make
>> it here.
>>
> Ok, so this should be set up using GPIO API's ?

Yes, the pins ultimately will be controlled by gpiolib APIs, but the
pins should be defined under the eth node in .dts

Thanks,
Sekhar
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