linux-kernel - Re: [PATCH v2] ARM: dts: BCM5301X: Make usb3 phy use mdio phy driver

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Date:   Wed, 18 Apr 2018 15:31:17 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vivek Unune <npcomplete13@...il.com>, hauke@...ke-m.de,
        zajec5@...il.com, jonmason@...adcom.com,
        bcm-kernel-feedback-list@...adcom.com, robh+dt@...nel.org,
        mark.rutland@....com, linux@...linux.org.uk
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ARM: dts: BCM5301X: Make usb3 phy use mdio phy driver

On 04/09/2018 03:31 PM, Vivek Unune wrote:
> Currently, usb3 phy in bcm5301x.dtsi uses platform driver which
> requires register range "ccb-mii" <0x18003000 0x1000>. This range
> overlaps with mdio cmd and param registers (<0x18003000 0x8>).
> Essentially, the platform driver partly acts like a mdio bus
> driver, hence to use of this register range.
> 
> In some Northstar devices like Linksys EA9500, secondary switch
> is connected via external mdio. The only way to access and
> configure the external switch is via mdio bus. When we enable the
> mdio bus in it's current state, the mdio bus and any child buses
> fail to register because of the register range overlap.
> 
> On Northstar, the usb3 phy is connected at address 0x10 on the
> internal mdio bus. This change moves the usb3_phy node and makes
> it a child node of internal mdio bus.
> 
> Thanks to Rafał Miłecki's commit af850e14a7ae
> ("phy: bcm-ns-usb3: add MDIO driver using proper bus layer") the
> same usb3 platform driver can now act as usb3 phy mdio driver.
> 
> Tested on Linksys Panamera (EA9500)
> 
> Signed-off-by: Vivek Unune <npcomplete13@...il.com>
> ---
> v2: Disabled usb3_phy by default, then enabled in dts where
>     necessary

Rafal, Hauke, this looks good to me, can you review? Thanks
-- 
Florian