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sandbox: i2c: Support i2c emulation with of-platdata

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At present the i2c emulators require access to the devicetree, which is
not possible (by design) with of-platdata.

Add a way for drivers to record the of-platdata index of their emulator,
so that we can still find the emulator.

This allows i2c emulation to work with of-platdata.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2021-03-15 17:25:30 +13:00
parent abaed70990
commit 728d04cc72
3 changed files with 43 additions and 2 deletions
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17
drivers/i2c/i2c-emul-uclass.c
View file

@ -31,14 +31,27 @@ struct udevice *i2c_emul_get_device(struct udevice *emul)
return uc_plat->dev;
}
void i2c_emul_set_idx(struct udevice *dev, int emul_idx)
{
struct dm_i2c_chip *plat = dev_get_parent_plat(dev);
plat->emul_idx = emul_idx;
}
int i2c_emul_find(struct udevice *dev, struct udevice **emulp)
{
struct i2c_emul_uc_plat *uc_plat;
struct udevice *emul;
int ret;
ret = uclass_find_device_by_phandle(UCLASS_I2C_EMUL, dev,
"sandbox,emul", &emul);
if (!CONFIG_IS_ENABLED(OF_PLATDATA)) {
ret = uclass_find_device_by_phandle(UCLASS_I2C_EMUL, dev,
"sandbox,emul", &emul);
} else {
struct dm_i2c_chip *plat = dev_get_parent_plat(dev);
ret = device_get_by_ofplat_idx(plat->emul_idx, &emul);
}
if (ret) {
log_err("No emulators for device '%s'\n", dev->name);
return ret;

13
drivers/rtc/sandbox_rtc.c
View file

@ -79,6 +79,18 @@ struct acpi_ops sandbox_rtc_acpi_ops = {
};
#endif
static int sandbox_rtc_bind(struct udevice *dev)
{
#if CONFIG_IS_ENABLED(PLATDATA)
struct sandbox_i2c_rtc_plat_data *plat = dev_get_plat(dev);
/* Set up the emul_idx for i2c_emul_find() */
i2c_emul_set_idx(dev, plat->dtplat.sandbox_emul->idx);
#endif
return 0;
}
static const struct rtc_ops sandbox_rtc_ops = {
.get = sandbox_rtc_get,
.set = sandbox_rtc_set,
@ -97,5 +109,6 @@ U_BOOT_DRIVER(sandbox_rtc) = {
.id = UCLASS_RTC,
.of_match = sandbox_rtc_ids,
.ops = &sandbox_rtc_ops,
.bind = sandbox_rtc_bind,
ACPI_OPS_PTR(&sandbox_rtc_acpi_ops)
};

15
include/i2c.h
View file

@ -93,6 +93,8 @@ struct udevice;
* datasheet explains it's usage of this addressing
* mode.
* @emul: Emulator for this chip address (only used for emulation)
* @emul_idx: Emulator index, used for of-platdata and set by each i2c chip's
* bind() method. This allows i2c_emul_find() to work with of-platdata.
*/
struct dm_i2c_chip {
uint chip_addr;
@ -102,6 +104,7 @@ struct dm_i2c_chip {
#ifdef CONFIG_SANDBOX
struct udevice *emul;
bool test_mode;
int emul_idx;
#endif
};
@ -554,6 +557,18 @@ void i2c_dump_msgs(struct i2c_msg *msg, int nmsgs);
*/
int i2c_emul_find(struct udevice *dev, struct udevice **emulp);
/**
* i2c_emul_set_idx() - Set the emulator index for an i2c sandbox device
*
* With of-platdata we cannot find the emulator using the device tree, so rely
* on the bind() method of each i2c driver calling this function to tell us
* the of-platdata idx of the emulator
*
* @dev: i2c device to set the emulator for
* @emul_idx: of-platdata index for that emulator
*/
void i2c_emul_set_idx(struct udevice *dev, int emul_idx);
/**
* i2c_emul_get_device() - Find the device being emulated
*