From d9699de85c44cb23280ca4b61a9fd846dd3508ce Mon Sep 17 00:00:00 2001 From: Peng Fan Date: Mon, 4 Jan 2016 13:16:41 +0800 Subject: imx: mx7: default enable MDIO open drain The management data input/output (MDIO) requires open-drain, i.MX7D TO1.0 ENET MDIO pin has no open drain, but TO1.1 supports this feature. So to TO1.1, need to enable open drain by setting bits GPR0[8:7] for TO1.1. Signed-off-by: Peng Fan Cc: Stefano Babic --- arch/arm/cpu/armv7/mx7/soc.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'arch/arm/cpu/armv7/mx7') diff --git a/arch/arm/cpu/armv7/mx7/soc.c b/arch/arm/cpu/armv7/mx7/soc.c index c777922..1d8e470 100644 --- a/arch/arm/cpu/armv7/mx7/soc.c +++ b/arch/arm/cpu/armv7/mx7/soc.c @@ -130,6 +130,24 @@ static void init_csu(void) writel(CSU_INIT_SEC_LEVEL0, CSU_IPS_BASE_ADDR + i * 4); } +static void imx_enet_mdio_fixup(void) +{ + struct iomuxc_gpr_base_regs *gpr_regs = + (struct iomuxc_gpr_base_regs *)IOMUXC_GPR_BASE_ADDR; + + /* + * The management data input/output (MDIO) requires open-drain, + * i.MX7D TO1.0 ENET MDIO pin has no open drain, but TO1.1 supports + * this feature. So to TO1.1, need to enable open drain by setting + * bits GPR0[8:7]. + */ + + if (soc_rev() >= CHIP_REV_1_1) { + setbits_le32(&gpr_regs->gpr[0], + IOMUXC_GPR_GPR0_ENET_MDIO_OPEN_DRAIN_MASK); + } +} + int arch_cpu_init(void) { init_aips(); @@ -138,6 +156,8 @@ int arch_cpu_init(void) /* Disable PDE bit of WMCR register */ imx_set_wdog_powerdown(false); + imx_enet_mdio_fixup(); + #ifdef CONFIG_APBH_DMA /* Start APBH DMA */ mxs_dma_init(); -- cgit v1.1