dm: sandbox: i2c: Add a new 'emulation parent' uclass
Sandbox i2c works using emulation drivers which are currently children of
the i2c device:
rtc_0: rtc@43 {
reg = <0x43>;
compatible = "sandbox-rtc";
emul {
compatible = "sandbox,i2c-rtc";
};
};
In this case the emulation device is attached to i2c bus on address 0x43
and provides the Real-Time-Clock (RTC) functionality.
However this is not ideal, since every device on an I2C bus has a child
device. This is only really the case for sandbox, but we want to avoid
special-case code for sandbox.
A better approach seems to be to add a separate node on the bus, an
'emulation parent'. This can be given a bogus address (such as 0xff) and
hides all the emulators away. Then we can use a phandle to point from the
device to the correct emualtor, and only on sandbox. The code to find an
emulator does not interfere with normal i2c operation.
Add a new UCLASS_I2C_EMUL_PARENT uclass which allows finding an emulator
given a bus, and finding a bus given an emulator. This will be used in a
follow-on patch.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/i2c/i2c-emul-uclass.c b/drivers/i2c/i2c-emul-uclass.c
index a2bdd5a..ae5aae0 100644
--- a/drivers/i2c/i2c-emul-uclass.c
+++ b/drivers/i2c/i2c-emul-uclass.c
@@ -6,8 +6,85 @@
#include <common.h>
#include <dm.h>
#include <i2c.h>
+#include <dm/device-internal.h>
+#include <dm/uclass-internal.h>
+
+/*
+ * i2c emulation works using an 'emul' node at the bus level. Each device in
+ * that node is in the UCLASS_I2C_EMUL uclass, and emulates one i2c device. A
+ * pointer to the device it emulates is in the 'dev' property of the emul device
+ * uclass platdata (struct i2c_emul_platdata), put there by i2c_emul_find().
+ * When sandbox wants an emulator for a device, it calls i2c_emul_find() which
+ * searches for the emulator with the correct address. To find the device for an
+ * emulator, call i2c_emul_get_device().
+ *
+ * The 'emul' node is in the UCLASS_I2C_EMUL_PARENT uclass. We use a separate
+ * uclass so avoid having strange devices on the I2C bus.
+ */
+
+/**
+ * struct i2c_emul_uc_platdata - information about the emulator for this device
+ *
+ * This is used by devices in UCLASS_I2C_EMUL to record information about the
+ * device being emulated. It is accessible with dev_get_uclass_platdata()
+ *
+ * @dev: Device being emulated
+ */
+struct i2c_emul_uc_platdata {
+ struct udevice *dev;
+};
+
+struct udevice *i2c_emul_get_device(struct udevice *emul)
+{
+ struct i2c_emul_uc_platdata *uc_plat = dev_get_uclass_platdata(emul);
+
+ return uc_plat->dev;
+}
+
+int i2c_emul_find(struct udevice *dev, struct udevice **emulp)
+{
+ struct i2c_emul_uc_platdata *uc_plat;
+ struct udevice *emul;
+ int ret;
+
+ ret = uclass_find_device_by_phandle(UCLASS_I2C_EMUL, dev,
+ "sandbox,emul", &emul);
+ if (ret) {
+ log_err("No emulators for device '%s'\n", dev->name);
+ return ret;
+ }
+ uc_plat = dev_get_uclass_platdata(emul);
+ uc_plat->dev = dev;
+ *emulp = emul;
+
+ return device_probe(emul);
+}
UCLASS_DRIVER(i2c_emul) = {
.id = UCLASS_I2C_EMUL,
.name = "i2c_emul",
+ .per_device_platdata_auto_alloc_size =
+ sizeof(struct i2c_emul_uc_platdata),
+};
+
+/*
+ * This uclass is a child of the i2c bus. Its platdata is not defined here so
+ * is defined by its parent, UCLASS_I2C, which uses struct dm_i2c_chip. See
+ * per_child_platdata_auto_alloc_size in UCLASS_DRIVER(i2c).
+ */
+UCLASS_DRIVER(i2c_emul_parent) = {
+ .id = UCLASS_I2C_EMUL_PARENT,
+ .name = "i2c_emul_parent",
+ .post_bind = dm_scan_fdt_dev,
+};
+
+static const struct udevice_id i2c_emul_parent_ids[] = {
+ { .compatible = "sandbox,i2c-emul-parent" },
+ { }
+};
+
+U_BOOT_DRIVER(i2c_emul_parent_drv) = {
+ .name = "i2c_emul_parent_drv",
+ .id = UCLASS_I2C_EMUL_PARENT,
+ .of_match = i2c_emul_parent_ids,
};