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| author | Nishanth Menon <nm@ti.com> | 2012-03-01 14:17:38 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-05-15 08:31:22 +0200 |
| commit | 3acb553439e3ee9f62f022f96f949c21811f8bdf (patch) | |
| tree | 769d474b7aa9976bf1835938eafdac7d15fd090c /arch/arm/include/asm/arch-omap4/clocks.h | |
| parent | a78274b2050dcacc29561f4e35bdc91b896578cd (diff) | |
| download | u-boot-imx-3acb553439e3ee9f62f022f96f949c21811f8bdf.zip u-boot-imx-3acb553439e3ee9f62f022f96f949c21811f8bdf.tar.gz u-boot-imx-3acb553439e3ee9f62f022f96f949c21811f8bdf.tar.bz2 | |
OMAP4460: TPS Ensure SET1 is selected after voltage configuration
TPS SET0/SET1 register is selected by a GPIO pin on OMAP4460 platforms.
Currently we control this pin with a mux configuration as part of
boot sequence.
Current configuration results in the following voltage waveform:
|---------------| (SET1 default 1.4V)
| --------(programmed voltage)
| <- (This switch happens on mux7,pullup)
vdd_mpu(TPS) -----/ (OPP boot voltage)
--------- (programmed voltage)
vdd_core(TWL6030) -----------------------/ (OPP boot voltage)
Problem 1) |<----- Tx ------>|
timing violation for a duration Tx close to few milliseconds.
Problem 2) voltage of MPU goes beyond spec for even the highest of MPU OPP.
By using GPIO as recommended as standard procedure by TI, the sequence
changes to:
-------- (programmed voltage)
vdd_mpu(TPS) ------------/ (Opp boot voltage)
--------- (programmed voltage)
vdd_core(TWL6030) -------------/ (OPP boot voltage)
NOTE: This does not attempt to address OMAP5 - Aneesh please confirm
Reported-by: Isabelle Gros <i-gros@ti.com>
Reported-by: Jerome Angeloni <j-angeloni@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Diffstat (limited to 'arch/arm/include/asm/arch-omap4/clocks.h')
| -rw-r--r-- | arch/arm/include/asm/arch-omap4/clocks.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/include/asm/arch-omap4/clocks.h b/arch/arm/include/asm/arch-omap4/clocks.h index 4e93950..62a339f 100644 --- a/arch/arm/include/asm/arch-omap4/clocks.h +++ b/arch/arm/include/asm/arch-omap4/clocks.h @@ -740,7 +740,7 @@ extern struct omap4_prcm_regs *const prcm; extern const u32 sys_clk_array[8]; void scale_vcores(void); -void do_scale_tps62361(u32 reg, u32 volt_mv); +void do_scale_tps62361(int gpio, u32 reg, u32 volt_mv); u32 omap_ddr_clk(void); void do_scale_vcore(u32 vcore_reg, u32 volt_mv); void setup_post_dividers(u32 *const base, const struct dpll_params *params); |