Commit 5b5c0135 authored by Rajendra Nayak's avatar Rajendra Nayak Committed by Tony Lindgren

ARM: OMAP2+: AM43x: Use gptimer as clocksource

The SyncTimer in AM43x is clocked using the following two sources:
1) An inaccuarte 32k clock (CLK_32KHZ) derived from PER DPLL, causing system
   time to go slowly (~10% deviation).
2) external 32KHz RTC clock, which may not always be available on board like
   in the case of ePOS EVM

Use gptimer as clocksource instead, as is done in the case of AM335x
(which does not have a SyncTimer). With this, system time keeping works
accurately.
Signed-off-by: default avatarRajendra Nayak <rnayak@ti.com>
Signed-off-by: default avatarLokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 7a2e0513
...@@ -229,7 +229,7 @@ DT_MACHINE_START(AM43_DT, "Generic AM43 (Flattened Device Tree)") ...@@ -229,7 +229,7 @@ DT_MACHINE_START(AM43_DT, "Generic AM43 (Flattened Device Tree)")
.init_late = am43xx_init_late, .init_late = am43xx_init_late,
.init_irq = omap_gic_of_init, .init_irq = omap_gic_of_init,
.init_machine = omap_generic_init, .init_machine = omap_generic_init,
.init_time = omap3_sync32k_timer_init, .init_time = omap3_gptimer_timer_init,
.dt_compat = am43_boards_compat, .dt_compat = am43_boards_compat,
MACHINE_END MACHINE_END
#endif #endif
......
...@@ -604,7 +604,8 @@ OMAP_SYS_32K_TIMER_INIT(3_secure, 12, "secure_32k_fck", "ti,timer-secure", ...@@ -604,7 +604,8 @@ OMAP_SYS_32K_TIMER_INIT(3_secure, 12, "secure_32k_fck", "ti,timer-secure",
2, "timer_sys_ck", NULL); 2, "timer_sys_ck", NULL);
#endif /* CONFIG_ARCH_OMAP3 */ #endif /* CONFIG_ARCH_OMAP3 */
#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX) #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX) || \
defined(CONFIG_SOC_AM43XX)
OMAP_SYS_GP_TIMER_INIT(3, 2, "timer_sys_ck", NULL, OMAP_SYS_GP_TIMER_INIT(3, 2, "timer_sys_ck", NULL,
1, "timer_sys_ck", "ti,timer-alwon"); 1, "timer_sys_ck", "ti,timer-alwon");
#endif #endif
......
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