[PATCH 0/3] rockchip: rk3308: Fix two minor UART warnings

[Massimo Pegorer]

Two minor issues arise as warning during boot phases once log features
and CONFIG_LOG_ERROR_RETURN are enabled:

- clk_get_rate() return err (SPL, pre relocation and U-Boot proper phases)
- uclass_get_device_by_phandle_id() return err (pre relocation phase only)

Both issues are not fatal and do not cause any functional problem, anyway
they are fixed with these patches. Moreover, the support added in RK3308
clock driver to get UARTs rate makes 'clock-frequency' property useless
in RK3308 based boards *-u-boot.dtsi files: due to the fact that UART
is inited by an external TPL, in other boot phases (SPL, U-Boot proper)
there is no need to know UART clock from DT but get it just reading how
external TPL has configured SoC registers.

<debug_uart>
s() returning err=-2

U-Boot SPL 2023.07-00560-gf2090b144c (Jul 27 2023 - 16:27:11 +0200)
Trying to boot from MMC1
INFO:    Preloader serial: 0
NOTICE:  BL31: v1.3(release):30f1405
NOTICE:  BL31: Built : 17:08:28, Sep 23 2019
INFO:    Lastlog: last=0x100000, realtime=0x102000, size=0x2000
INFO:    ARM GICv2 driver initialized
INFO:    Using opteed sec cpu_context!
INFO:    boot cpu mask: 1
INFO:    plat_rockchip_pmu_init: pd status 0xe b
INFO:    BL31: Initializing runtime services
WARNING: No OPTEE provided by BL2 boot loader, Booting device without OPTEE initialization. SMC`s destined for OPTEE will return SMC_UNK
ERROR:   Error initializing runtime service opteed_fast
INFO:    BL31: Preparing for EL3 exit to normal world
INFO:    Entry point address = 0x600000
INFO:    SPSR = 0x3c9

<debug_uart>
        clk_get_rate() returning err=-2
pinctrl_select_state_full() ns16550_serial serial at ff0a0000: pinctrl_select_state_full: uclass_get_device_by_phandle_id: err=-19
pinctrl_select_state_full() ns16550_serial serial at ff0a0000: pinctrl_select_state_full: uclass_get_device_by_phandle_id: err=-19
pinctrl_select_state_full() ns16550_serial serial at ff0a0000: pinctrl_select_state_full: uclass_get_device_by_phandle_id: err=-19


U-Boot 2023.07-00560-gf2090b144c (Jul 27 2023 - 16:27:11 +0200)

Model: Radxa ROCK Pi S
DRAM:  512 MiB (effective 510 MiB)
        clk_get_rate() returning err=-2
Core:  287 devices, 23 uclasses, devicetree: separate
MMC:   mmc at ff480000: 1, mmc at ff490000: 0, mmc at ff4a0000: 2


Massimo Pegorer (3):
  clk: rockchip: rk3308: Fix ordering between masking and shifting
  clk: rockchip: rk3308: Support reading UART rate and clock registers
  dts: rockchip: rk3308: Avoid warning for serial probe on prereloc

 arch/arm/dts/rk3308-rock-pi-s-u-boot.dtsi     | 29 +++++++-
 arch/arm/include/asm/arch-rk3308/cru_rk3308.h | 15 ++++
 drivers/clk/rockchip/clk_rk3308.c             | 69 +++++++++++++++++--
 3 files changed, 106 insertions(+), 7 deletions(-)

-- 
2.34.1