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| author | Dino Li <Dino.Li@ite.com.tw> | 2021-07-07 15:55:04 +0800 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-07-22 19:54:04 +0000 |
| commit | 154f661f50d08adc3a546360be020a7e0321fe2e (patch) | |
| tree | 0a85a77f8aa5215595a91cf9c5d3c39972387c27 /include | |
| parent | 506a1ee872aad4ef21d7c90717f1917963dec6b1 (diff) | |
| download | chrome-ec-154f661f50d08adc3a546360be020a7e0321fe2e.tar.gz | |
zephyr: i2c: protect physical port
If i2c devices are connected to the same port, they should
use the same mutex_lock() index. So the new transaction won't
break the ongoing transaction.
BRANCH=none
BUG=b:189855648
TEST=Enable CONFIG_SMBUS_PEC and voltage regulator function on asurada.
No i2c transaction is broken.
Change-Id: Ib848e3c2e60b99ce66ad5fd2fc7095f90820a15d
Signed-off-by: Dino Li <Dino.Li@ite.com.tw>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3010920
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Denis Brockus <dbrockus@chromium.org>
Commit-Queue: Denis Brockus <dbrockus@chromium.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/i2c.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/i2c.h b/include/i2c.h index 231561caea..4d49ec96e8 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -590,4 +590,18 @@ enum i2c_freq i2c_get_freq(int port); /* Find the matching port in i2c_ports[] table. */ const struct i2c_port_t *get_i2c_port(const int port); +/** + * @brief Get soc's i2c port number where i2c device is connected to. + * + * This function translate a i2c port enum value (enum-name property listed in + * named-i2c-ports) to soc's i2c port. Devices which are connected to the + * same port of soc should have the same number. + * + * @param enum_port i2c port enum value. + * @return i2c port of soc used in mutex_lock(). + * -1 if physical port is not defined or i2c port number is out of + * port_mutex space. + */ +int i2c_get_physical_port(int enum_port); + #endif /* __CROS_EC_I2C_H */ |