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 --- arch/arm/cpu/armv7/ls102xa/Kconfig | 9 +++++++++ arch/arm/cpu/armv7/ls102xa/soc.c | 4 ++-- 2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/arch/arm/cpu/armv7/ls102xa/Kconfig b/arch/arm/cpu/armv7/ls102xa/Kconfig index e75a895e00..f6b07b6026 100644 --- a/arch/arm/cpu/armv7/ls102xa/Kconfig +++ b/arch/arm/cpu/armv7/ls102xa/Kconfig @@ -98,4 +98,13 @@ config SYS_FSL_IFC_BANK_COUNT 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 diff --git a/arch/arm/cpu/armv7/ls102xa/soc.c b/arch/arm/cpu/armv7/ls102xa/soc.c index 21570204b0..84d4ea3a8f 100644 --- a/arch/arm/cpu/armv7/ls102xa/soc.c +++ b/arch/arm/cpu/armv7/ls102xa/soc.c @@ -169,8 +169,8 @@ int arch_soc_init(void) #ifdef CONFIG_LAYERSCAPE_NS_ACCESS enable_layerscape_ns_access(); #endif - -#if defined(CONFIG_FSL_QSPI) + +#if defined(CONFIG_FSL_QSPI) && !defined(CONFIG_SYS_FSL_QSPI_SKIP_CLKSEL) out_be32(&scfg->qspi_cfg, SCFG_QSPI_CLKSEL); #endif