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b7c25b11b6
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>
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|---|---|---|
| .. | ||
| platform_data | ||
| device-internal.h | ||
| device.h | ||
| fdtaddr.h | ||
| lists.h | ||
| of.h | ||
| of_access.h | ||
| of_addr.h | ||
| of_extra.h | ||
| ofnode.h | ||
| pinctrl.h | ||
| platdata.h | ||
| read.h | ||
| root.h | ||
| test.h | ||
| uclass-id.h | ||
| uclass-internal.h | ||
| uclass.h | ||
| util.h | ||