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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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bf8147208e
This patch is important for the MicroSOM implementation due to the following details - 1. VIH of the Atheros phy is 1.7V. 2. NVCC_ENET which is the power domain of the MDIO pad is driven by the PHY's LDO (i.e. either 1.8v or 2.5v). 3. The MicroSOM implements an onbouard 1.6kohm pull up to 3.3v (R3000). In the case the PHY's LDO was 1.8v then there would be only a 100mV margin for the signal to be acknowledged as high (1.8v-1.7v). Due to that setting the pad as an open drain will let the 1.6kohm pull that signal high to 3.3 that assures enough margins to the PHY to be acked as '1' logic. Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
62 lines
2 KiB
Text
62 lines
2 KiB
Text
/*
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* Copyright (C) 2013,2014 Russell King
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*
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* This describes the hookup for an AR8035 to the iMX6 on the SolidRun
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* MicroSOM.
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*/
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&fec {
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_microsom_enet_ar8035>;
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phy-mode = "rgmii";
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phy-reset-duration = <2>;
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phy-reset-gpios = <&gpio4 15 0>;
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status = "okay";
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};
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&iomuxc {
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enet {
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pinctrl_microsom_enet_ar8035: microsom-enet-ar8035 {
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fsl,pins = <
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MX6QDL_PAD_ENET_MDIO__ENET_MDIO 0x1b8b0
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MX6QDL_PAD_ENET_MDC__ENET_MDC 0x1b0b0
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/* AR8035 reset */
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MX6QDL_PAD_KEY_ROW4__GPIO4_IO15 0x130b0
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/* AR8035 interrupt */
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MX6QDL_PAD_DI0_PIN2__GPIO4_IO18 0x80000000
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/* GPIO16 -> AR8035 25MHz */
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MX6QDL_PAD_GPIO_16__ENET_REF_CLK 0xc0000000
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MX6QDL_PAD_RGMII_TXC__RGMII_TXC 0x80000000
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MX6QDL_PAD_RGMII_TD0__RGMII_TD0 0x1b030
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MX6QDL_PAD_RGMII_TD1__RGMII_TD1 0x1b030
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MX6QDL_PAD_RGMII_TD2__RGMII_TD2 0x1b030
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MX6QDL_PAD_RGMII_TD3__RGMII_TD3 0x1b030
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MX6QDL_PAD_RGMII_TX_CTL__RGMII_TX_CTL 0x1b030
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/* AR8035 CLK_25M --> ENET_REF_CLK (V22) */
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MX6QDL_PAD_ENET_REF_CLK__ENET_TX_CLK 0x0a0b1
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/* AR8035 pin strapping: IO voltage: pull up */
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MX6QDL_PAD_RGMII_RXC__RGMII_RXC 0x1b030
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/* AR8035 pin strapping: PHYADDR#0: pull down */
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MX6QDL_PAD_RGMII_RD0__RGMII_RD0 0x13030
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/* AR8035 pin strapping: PHYADDR#1: pull down */
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MX6QDL_PAD_RGMII_RD1__RGMII_RD1 0x13030
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/* AR8035 pin strapping: MODE#1: pull up */
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MX6QDL_PAD_RGMII_RD2__RGMII_RD2 0x1b030
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/* AR8035 pin strapping: MODE#3: pull up */
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MX6QDL_PAD_RGMII_RD3__RGMII_RD3 0x1b030
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/* AR8035 pin strapping: MODE#0: pull down */
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MX6QDL_PAD_RGMII_RX_CTL__RGMII_RX_CTL 0x13030
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/*
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* As the RMII pins are also connected to RGMII
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* so that an AR8030 can be placed, set these
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* to high-z with the same pulls as above.
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* Use the GPIO settings to avoid changing the
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* input select registers.
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*/
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MX6QDL_PAD_ENET_CRS_DV__GPIO1_IO25 0x03000
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MX6QDL_PAD_ENET_RXD0__GPIO1_IO27 0x03000
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MX6QDL_PAD_ENET_RXD1__GPIO1_IO26 0x03000
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>;
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};
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};
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};
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