linux-kernel - Re: [PATCH 2/2] ARM: dts: ls1021a-tsn: Use interrupts for the SGMII PHYs

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Message-ID: <CA+h21hqw16o0TqOV1WWYYcOs3YWJe=xq_K0=miU+BFTA31OTmQ@mail.gmail.com>
Date:   Tue, 12 Nov 2019 15:44:16 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH 2/2] ARM: dts: ls1021a-tsn: Use interrupts for the SGMII PHYs

On Tue, 12 Nov 2019 at 15:20, Rasmus Villemoes <linux@...musvillemoes.dk> wrote:
>
> From: Vladimir Oltean <olteanv@...il.com>
>
> On the LS1021A-TSN board, the 2 Atheros AR8031 PHYs for eth0 and eth1
> have interrupt lines connected to the shared IRQ2_B LS1021A pin.
>
> Switching to interrupts offloads the PHY library from the task of
> polling the MDIO status and AN registers (1, 4, 5) every second.
>
> Unfortunately, the BCM5464R quad PHY connected to the switch does not
> appear to have an interrupt line routed to the SoC.
>
> Signed-off-by: Vladimir Oltean <olteanv@...il.com>
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> ---
>  arch/arm/boot/dts/ls1021a-tsn.dts | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/boot/dts/ls1021a-tsn.dts b/arch/arm/boot/dts/ls1021a-tsn.dts
> index 5b7689094b70..135d36461af4 100644
> --- a/arch/arm/boot/dts/ls1021a-tsn.dts
> +++ b/arch/arm/boot/dts/ls1021a-tsn.dts
> @@ -203,11 +203,15 @@
>         /* AR8031 */
>         sgmii_phy1: ethernet-phy@1 {
>                 reg = <0x1>;
> +               /* SGMII1_PHY_INT_B: connected to IRQ2, active low */
> +               interrupts-extended = <&extirq 2 IRQ_TYPE_EDGE_FALLING>;
>         };
>
>         /* AR8031 */
>         sgmii_phy2: ethernet-phy@2 {
>                 reg = <0x2>;
> +               /* SGMII2_PHY_INT_B: connected to IRQ2, active low */
> +               interrupts-extended = <&extirq 2 IRQ_TYPE_EDGE_FALLING>;
>         };
>
>         /* BCM5464 quad PHY */
> --
> 2.23.0
>

+netdev and Andrew for this patch, since the interrupt polarity caught
his attention in v1.