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armv7: ls102xa: make QSPI clock selection optional during SoC init

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To improve startup times when booting from QSPI flash, the QSPI frequency
can be configured very early in the boot process [1] to reduce loading
times of U-Boot itself. This patch adds an option to disable setting the
frequency to a default value during SoC initialization.

[1] https://www.nxp.com/docs/en/application-note/AN12279.pdf

Signed-off-by: Mario Kicherer <dev@kicherer.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Mario Kicherer 2023-02-01 14:16:22 +08:00 • committed by Peng Fan
parent a25dad7459
commit ba89878d70
2 changed files with 10 additions and 1 deletions
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9
arch/arm/cpu/armv7/ls102xa/Kconfig
View file

@ -96,4 +96,13 @@ config SYS_FSL_HAS_CCI400
config SYS_FSL_ERRATUM_A008407
bool
config SYS_FSL_QSPI_SKIP_CLKSEL
bool "Skip setting QSPI clock during SoC init"
default 0
help
To improve startup times when booting from QSPI flash, the QSPI
frequency can be set very early in the boot process. If this option
is enabled, the QSPI frequency will not be changed by U-Boot during
SoC initialization.
endmenu

2
arch/arm/cpu/armv7/ls102xa/soc.c
View file

@ -170,7 +170,7 @@ int arch_soc_init(void)
enable_layerscape_ns_access();
#endif
#ifdef CONFIG_FSL_QSPI
#if defined(CONFIG_FSL_QSPI) && !defined(CONFIG_SYS_FSL_QSPI_SKIP_CLKSEL)
out_be32(&scfg->qspi_cfg, SCFG_QSPI_CLKSEL);
#endif