linux-kernel - Re: [PATCH net-next 6/7] net/faraday: Fix phy link irq on Aspeed G5 SoCs

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Date:   Tue, 20 Sep 2016 17:29:40 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Joel Stanley <joel@....id.au>, davem@...emloft.net,
        gwshan@...ux.vnet.ibm.com, andrew@...id.au, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 6/7] net/faraday: Fix phy link irq on Aspeed G5
 SoCs

On Tue, Sep 20, 2016 at 10:13:14PM +1000, Benjamin Herrenschmidt wrote:
> On Tue, 2016-09-20 at 16:00 +0930, Joel Stanley wrote:
> > On Aspeed SoC with a direct PHY connection (non-NSCI), we receive
> > continual PHYSTS interrupts:
> > 
> >  [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
> >  [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
> >  [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
> >  [   20.300000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
> > 
> > This is because the driver was enabling low-level sensitive interrupt
> > generation where the systems are wired for high-level. All CPU cycles
> > are spent servicing this interrupt.
> 
> If this is a system wiring issue, should it be represented by a DT
> property ?

Is there a device tree binding document somewhere?

Is it possible just to put ACTIVE_HIGH in the right place in the
binding?

	Andrew