u-boot/arch
Krzysztof Kozlowski ae781d56fe arm: dts: exynos: Add ramp delay property to LDO regulators to Odroid XU3 family
Add startup time to LDO regulators of S2MPS11 PMIC on Odroid XU3/XU4/HC1
family of boards to be sure the voltage is proper before relying on the
regulator.

The datasheet for all the S2MPS1x family is inconsistent here and does
not specify unambiguously the value of ramp delay for LDO.  It mentions
30 mV/us in one timing diagram but then omits it completely in LDO
regulator characteristics table (it is specified for bucks).

However the vendor kernels for Galaxy S5 and Odroid XU3 use values of 12
mV/us or 24 mV/us.

Without the ramp delay value the consumers do not wait for voltage
settle after changing it.  Although the proper value of ramp delay for
LDOs is unknown, it seems safer to use at least some value from
reference kernel than to leave it unset.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
2019-03-11 15:53:19 +09:00
..
arc ARC: cache: define CONFIG_SYS_CACHELINE_SIZE as ARCH_DMA_MINALIGN 2019-01-25 08:41:09 +03:00
arm arm: dts: exynos: Add ramp delay property to LDO regulators to Odroid XU3 family 2019-03-11 15:53:19 +09:00
m68k m68k: ColdFire mcf5441x, add eSDHC support 2018-09-16 00:01:13 +02:00
microblaze arch: types.h: factor out fixed width typedefs to int-ll64.h 2018-09-10 20:48:16 -04:00
mips dt: bcm6838: add watchdog 2019-02-09 07:50:50 -05:00
nds32 nds32: dts: Fix mmc node compatible string 2019-01-22 17:36:20 +08:00
nios2 .gitignore: move *.dtb and *.dtb.S patterns to the top-level .gitignore 2018-06-18 14:43:12 -04:00
powerpc Merge git://git.denx.de/u-boot-fsl-qoriq 2019-03-04 13:05:53 -05:00
riscv riscv: Enable CONFIG_SYS_BOOT_RAMDISK_HIGH for using initrd 2019-02-27 09:12:34 +08:00
sandbox clk: Add fixed-factor clock driver 2019-02-27 09:12:33 +08:00
sh sh: bitops: add hweight*() macros 2019-02-07 15:33:21 +05:30
x86 x86: Add sound support for samus 2019-02-20 15:27:11 +08:00
xtensa xtensa: use asm-generic/atomic.h 2018-09-25 21:49:18 -04:00
.gitignore
Kconfig riscv: Enable create symlink using kconfig 2019-02-27 09:12:33 +08:00