linux-kernel - Re: [PATCH] ARM: BCM5301X: Specify PHY of USB 2.0 in DT

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Date:	Wed, 1 Jun 2016 21:35:26 +0200
From:	Rafał Miłecki <zajec5@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Hauke Mehrtens <hauke@...ke-m.de>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@...linux.org.uk>,
	"open list:BROADCOM BCM5301X ARM ARCHITECTURE" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	Jon Mason <jon.mason@...adcom.com>
Subject: Re: [PATCH] ARM: BCM5301X: Specify PHY of USB 2.0 in DT

On 1 June 2016 at 21:21, Florian Fainelli <f.fainelli@...il.com> wrote:
> On 06/01/2016 12:16 PM, Rafał Miłecki wrote:
>> Driver for Northstar USB 2.0 PHY was added in 4.7-rc1 by:
>> commit d3feb4067335 ("phy: bcm-ns-usb2: new driver for USB 2.0 PHY on
>> Northstar").
>> It should be used to let EHCI platform driver init PHY.
>>
>> Signed-off-by: Rafał Miłecki <zajec5@...il.com>
>> ---
>>  arch/arm/boot/dts/bcm5301x.dtsi | 18 ++++++++++++++++++
>>  1 file changed, 18 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/bcm5301x.dtsi b/arch/arm/boot/dts/bcm5301x.dtsi
>> index 7d4d29b..9300e19 100644
>> --- a/arch/arm/boot/dts/bcm5301x.dtsi
>> +++ b/arch/arm/boot/dts/bcm5301x.dtsi
>> @@ -140,6 +140,22 @@
>>               };
>>       };
>>
>> +     phys {
>> +             compatible = "simple-bus";
>> +             ranges = <0x00000000 0x18000000 0x00100000>;
>> +             #address-cells = <1>;
>> +             #size-cells = <1>;
>> +
>> +             usb2_phy2: usb2-phy {
>> +                     compatible = "brcm,ns-usb2-phy";
>> +                     reg = <0x0000c000 0x1000>;
>> +                     reg-names = "dmu";
>> +                     #phy-cells = <0>;
>> +                     clocks = <&genpll BCM_NSP_GENPLL_USB_PHY_REF_CLK>;
>> +                     clock-names = "phy-ref-clk";
>> +             };
>
> You guys need to get everything straigthen up when it comes to busing
> and child nodes for bcm53101x.dtsi, why do we need a "simple-bus" node
> here which overlaps in part with the brcm-bus-axi node's range?

I believed I'm making things cleaner by adding a separated node for
PHYs (in the future there will be also USB 3.0 PHY and probably a PCIe
PHY). I'm fine with placing this PHY node somewhere else if you think
it better fits there.

-- 
Rafał