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

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Date:   Tue, 12 Jun 2018 11:49:39 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     bcm-kernel-feedback-list@...adcom.com,
        Vivek Unune <npcomplete13@...il.com>,
        florian.fainelli@...adcom.com, hauke@...ke-m.de, zajec5@...il.com,
        jonmason@...adcom.com, robh+dt@...nel.org, mark.rutland@....com,
        linux@...linux.org.uk
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] ARM: dts: BCM5301X: Make usb3 phy use mdio phy driver

On Mon,  9 Apr 2018 18:31:53 -0400, Vivek Unune <npcomplete13@...il.com> 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>
> ---

Applied to devicetree/next, thanks!
--
Florian