test: dm: add MDIO test
A very simple test for DM_MDIO, mimicks a register write/read through the
sandbox bus to a dummy PHY.
Signed-off-by: Alex Marginean <alexm.osslist@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 6fba5a8..635f8d7 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -24,6 +24,16 @@
This is currently implemented in net/mdio-uclass.c
Look in include/miiphy.h for details.
+config MDIO_SANDBOX
+ depends on DM_MDIO && SANDBOX
+ default y
+ bool "Sandbox: Mocked MDIO driver"
+ help
+ This driver implements dummy read/write/reset MDIO functions mimicking
+ a bus with a single PHY.
+
+ This driver is used in for testing in test/dm/mdio.c
+
menuconfig NETDEVICES
bool "Network device support"
depends on NET
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 8d02a37..4003842 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -77,3 +77,4 @@
obj-$(CONFIG_MEDIATEK_ETH) += mtk_eth.o
obj-y += mscc_eswitch/
obj-$(CONFIG_HIGMACV300_ETH) += higmacv300.o
+obj-$(CONFIG_MDIO_SANDBOX) += mdio_sandbox.o
diff --git a/drivers/net/mdio_sandbox.c b/drivers/net/mdio_sandbox.c
new file mode 100644
index 0000000..07515e0
--- /dev/null
+++ b/drivers/net/mdio_sandbox.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2019
+ * Alex Marginean, NXP
+ */
+
+#include <dm.h>
+#include <errno.h>
+#include <miiphy.h>
+
+#define SANDBOX_PHY_ADDR 5
+#define SANDBOX_PHY_REG 0
+
+struct mdio_sandbox_priv {
+ int enabled;
+ u16 reg;
+};
+
+static int mdio_sandbox_read(struct udevice *dev, int addr, int devad, int reg)
+{
+ struct mdio_sandbox_priv *priv = dev_get_priv(dev);
+
+ if (!priv->enabled)
+ return -ENODEV;
+
+ if (addr != SANDBOX_PHY_ADDR)
+ return -ENODEV;
+ if (devad != MDIO_DEVAD_NONE)
+ return -ENODEV;
+ if (reg != SANDBOX_PHY_REG)
+ return -ENODEV;
+
+ return priv->reg;
+}
+
+static int mdio_sandbox_write(struct udevice *dev, int addr, int devad, int reg,
+ u16 val)
+{
+ struct mdio_sandbox_priv *priv = dev_get_priv(dev);
+
+ if (!priv->enabled)
+ return -ENODEV;
+
+ if (addr != SANDBOX_PHY_ADDR)
+ return -ENODEV;
+ if (devad != MDIO_DEVAD_NONE)
+ return -ENODEV;
+ if (reg != SANDBOX_PHY_REG)
+ return -ENODEV;
+
+ priv->reg = val;
+
+ return 0;
+}
+
+static int mdio_sandbox_reset(struct udevice *dev)
+{
+ struct mdio_sandbox_priv *priv = dev_get_priv(dev);
+
+ priv->reg = 0;
+
+ return 0;
+}
+
+static const struct mdio_ops mdio_sandbox_ops = {
+ .read = mdio_sandbox_read,
+ .write = mdio_sandbox_write,
+ .reset = mdio_sandbox_reset,
+};
+
+static int mdio_sandbox_probe(struct udevice *dev)
+{
+ struct mdio_sandbox_priv *priv = dev_get_priv(dev);
+
+ priv->enabled = 1;
+
+ return 0;
+}
+
+static const struct udevice_id mdio_sandbox_ids[] = {
+ { .compatible = "sandbox,mdio" },
+ { }
+};
+
+U_BOOT_DRIVER(mdio_sandbox) = {
+ .name = "mdio_sandbox",
+ .id = UCLASS_MDIO,
+ .of_match = mdio_sandbox_ids,
+ .probe = mdio_sandbox_probe,
+ .ops = &mdio_sandbox_ops,
+ .priv_auto_alloc_size = sizeof(struct mdio_sandbox_priv),
+};