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Fri, 1 Apr 2022 06:59:06 +0000 From: Howard Chiu <howard_chiu@aspeedtech.com> To: "robh+dt@kernel.org" <robh+dt@kernel.org>, Joel Stanley <joel@jms.id.au>, "andrew@aj.id.au" <andrew@aj.id.au>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "linux-aspeed@lists.ozlabs.org" <linux-aspeed@lists.ozlabs.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: [PATCH v2] ARM: dts: aspeed: ast2600-evb: Enable RX delay for MAC0/MAC1 Thread-Topic: [PATCH v2] ARM: dts: aspeed: ast2600-evb: Enable RX delay for MAC0/MAC1 Thread-Index: Adg6q5SUIZgpr960SrG6YRlAezQpnw== Date: Fri, 1 Apr 2022 06:59:06 +0000 Message-ID: <SG2PR06MB23152A548AAE81140B57DD69E6E09@SG2PR06MB2315.apcprd06.prod.outlook.com> Accept-Language: en-US Content-Language: zh-TW X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=aspeedtech.com; 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[v2] ARM: dts: aspeed: ast2600-evb: Enable RX delay for MAC0/MAC1
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diff --git a/arch/arm/boot/dts/aspeed-ast2600-evb.dts b/arch/arm/boot/dts/aspeed-ast2600-evb.dts index b7eb552640cb..788448cdd6b3 100644 --- a/arch/arm/boot/dts/aspeed-ast2600-evb.dts +++ b/arch/arm/boot/dts/aspeed-ast2600-evb.dts @@ -103,7 +103,7 @@ ethphy3: ethernet-phy@0 { &mac0 { status = "okay"; - phy-mode = "rgmii"; + phy-mode = "rgmii-rxid"; phy-handle = <ðphy0>; pinctrl-names = "default"; @@ -114,7 +114,7 @@ &mac0 { &mac1 { status = "okay"; - phy-mode = "rgmii"; + phy-mode = "rgmii-rxid"; phy-handle = <ðphy1>; pinctrl-names = "default";
Since mac0/1 and mac2/3 are physically located on different die, they have different properties by nature, which is mac0/1 has smaller delay step. The property 'phy-mode' on ast2600 mac0 and mac1 is recommended to set to 'rgmii-rxid' which enables the RX interface delay from the PHY chip. Refer page 45 of SDK User Guide v08.00 https://github.com/AspeedTech-BMC/openbmc/releases/download/v08.00/SDK_User_Guide_v08.00.pdf Signed-off-by: Howard Chiu <howard_chiu@aspeedtech.com> --- Change since v1: 1. Remove mac*-clk-delay due to lack of driver support arch/arm/boot/dts/aspeed-ast2600-evb.dts | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)