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 <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
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 @@
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 @@
/* 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();
diff --git a/arch/arm/include/asm/arch-mx7/imx-regs.h b/arch/arm/include/asm/arch-mx7/imx-regs.h
index e28a807..58a25c7 100644
--- a/arch/arm/include/asm/arch-mx7/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx7/imx-regs.h
@@ -272,6 +272,8 @@
#define IOMUXC_GPR_GPR0_DMAREQ_MUX_SEL5_SHIFT 5
#define IOMUXC_GPR_GPR0_DMAREQ_MUX_SEL6_MASK 0x40u
#define IOMUXC_GPR_GPR0_DMAREQ_MUX_SEL6_SHIFT 6
+#define IOMUXC_GPR_GPR0_ENET_MDIO_OPEN_DRAIN_MASK (3 << 7)
+#define IOMUXC_GPR_GPR0_ENET_MDIO_OPEN_DRAIN_SHIFT 7
/* GPR1 Bit Fields */
#define IOMUXC_GPR_GPR1_GPR_WEIM_ACT_CS0_MASK 0x1u
#define IOMUXC_GPR_GPR1_GPR_WEIM_ACT_CS0_SHIFT 0