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serial: zynqmp: Fetch baudrate from dtb and update

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The baudrate configured in .config is taken by default by serial. If
change of baudrate is required then the .config needs to changed and
u-boot recompilation is required or the u-boot environment needs to be
updated.

To avoid this, support is added to fetch the baudrate directly from the
device tree file and update.
The serial, prints the log with the configured baudrate in the dtb.
The commit c4df0f6f31 ("arm: mvebu: Espressobin: Set default value for
$fdtfile env variable") is taken as reference for changing the default
environment variable.

The default environment stores the default baudrate value, When default
baudrate and dtb baudrate are not same glitches are seen on the serial.
So, the environment also needs to be updated with the dtb baudrate to
avoid the glitches on the serial.

Also add test to cover this new function.

Signed-off-by: Algapally Santosh Sagar <santoshsagar.algapally@amd.com>
Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
Link: https://lore.kernel.org/r/20230921112043.3144726-3-venkatesh.abbarapu@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
Algapally Santosh Sagar 2023-09-21 16:50:43 +05:30 • committed by Michal Simek
parent 8819892bdb
commit bd9ff681bd
9 changed files with 143 additions and 3 deletions
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6
include/env_default.h
View file

@ -42,7 +42,7 @@ const char default_environment[] = {
#if defined(CONFIG_BOOTDELAY)
"bootdelay=" __stringify(CONFIG_BOOTDELAY) "\0"
#endif
#if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
#if !defined(CONFIG_OF_SERIAL_BAUD) && defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
"baudrate=" __stringify(CONFIG_BAUDRATE) "\0"
#endif
#ifdef CONFIG_LOADS_ECHO
@ -118,6 +118,10 @@ const char default_environment[] = {
#endif
#ifdef CFG_EXTRA_ENV_SETTINGS
CFG_EXTRA_ENV_SETTINGS
#endif
#ifdef CONFIG_OF_SERIAL_BAUD
/* Padding for baudrate at the end when environment is writable */
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
#endif
"\0"
#else /* CONFIG_USE_DEFAULT_ENV_FILE */