ARM: OMAP2+: Initialize SoC PM later

There's no need to probe devices until at module_init time and we
currently have at least PM trying to use I2C for PMICs early on.

As only a part of the SoC init_early is SoC specific, we only need to call
the SoC specific PM init function. And we can modify omap2_common_pm_late_init()
so it becomes a late_initcall().

Note that this changes am335x to call omap2_clk_enable_autoidle_all() that
seems to be missing currently.

Cc: Keerthy <j-keerthy@ti.com>
Cc: Tero Kristo <t-kristo@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/common.h

@@ -44,6 +44,9 @@
 
 #define OMAP_INTC_START		NR_IRQS
 
+extern int (*omap_pm_soc_init)(void);
+int omap_pm_nop_init(void);
+
 #if defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP2)
 int omap2_pm_init(void);
 #else
@@ -79,9 +82,12 @@ static inline int omap4_pm_init_early(void)
 
 #if defined(CONFIG_PM) && (defined(CONFIG_SOC_AM33XX) || \
 	defined(CONFIG_SOC_AM43XX))
-void amx3_common_pm_init(void);
+int amx3_common_pm_init(void);
 #else
-static inline void amx3_common_pm_init(void) { }
+static inline int amx3_common_pm_init(void)
+{
+	return 0;
+}
 #endif
 
 extern void omap2_init_common_infrastructure(void);
@@ -122,14 +128,10 @@ void am43xx_init_early(void);
 void am43xx_init_late(void);
 void omap4430_init_early(void);
 void omap5_init_early(void);
-void omap3_init_late(void);	/* Do not use this one */
+void omap3_init_late(void);
 void omap4430_init_late(void);
 void omap2420_init_late(void);
 void omap2430_init_late(void);
-void omap3430_init_late(void);
-void omap35xx_init_late(void);
-void omap3630_init_late(void);
-void am35xx_init_late(void);
 void ti81xx_init_late(void);
 void am33xx_init_late(void);
 void omap5_init_late(void);

arch/arm/mach-omap2/io.c

@@ -422,11 +422,6 @@ static void __init __maybe_unused omap_hwmod_init_postsetup(void)
 	omap_hwmod_for_each(_set_hwmod_postsetup_state, &postsetup_state);
 }
 
-static void __init __maybe_unused omap_common_late_init(void)
-{
-	omap2_common_pm_late_init();
-}
-
 #ifdef CONFIG_SOC_OMAP2420
 void __init omap2420_init_early(void)
 {
@@ -447,9 +442,7 @@ void __init omap2420_init_early(void)
 
 void __init omap2420_init_late(void)
 {
-	omap_common_late_init();
-	omap2_pm_init();
-	omap2_clk_enable_autoidle_all();
+	omap_pm_soc_init = omap2_pm_init;
 }
 #endif
 
@@ -473,9 +466,7 @@ void __init omap2430_init_early(void)
 
 void __init omap2430_init_late(void)
 {
-	omap_common_late_init();
-	omap2_pm_init();
-	omap2_clk_enable_autoidle_all();
+	omap_pm_soc_init = omap2_pm_init;
 }
 #endif
 
@@ -526,43 +517,12 @@ void __init am35xx_init_early(void)
 
 void __init omap3_init_late(void)
 {
-	omap_common_late_init();
-	omap3_pm_init();
-	omap2_clk_enable_autoidle_all();
-}
-
-void __init omap3430_init_late(void)
-{
-	omap_common_late_init();
-	omap3_pm_init();
-	omap2_clk_enable_autoidle_all();
-}
-
-void __init omap35xx_init_late(void)
-{
-	omap_common_late_init();
-	omap3_pm_init();
-	omap2_clk_enable_autoidle_all();
-}
-
-void __init omap3630_init_late(void)
-{
-	omap_common_late_init();
-	omap3_pm_init();
-	omap2_clk_enable_autoidle_all();
-}
-
-void __init am35xx_init_late(void)
-{
-	omap_common_late_init();
-	omap3_pm_init();
-	omap2_clk_enable_autoidle_all();
+	omap_pm_soc_init = omap3_pm_init;
 }
 
 void __init ti81xx_init_late(void)
 {
-	omap_common_late_init();
-	omap2_clk_enable_autoidle_all();
+	omap_pm_soc_init = omap_pm_nop_init;
 }
 #endif
 
@@ -618,8 +578,7 @@ void __init am33xx_init_early(void)
 
 void __init am33xx_init_late(void)
 {
-	omap_common_late_init();
-	amx3_common_pm_init();
+	omap_pm_soc_init = amx3_common_pm_init;
 }
 #endif
 
@@ -642,9 +601,7 @@ void __init am43xx_init_early(void)
 
 void __init am43xx_init_late(void)
 {
-	omap_common_late_init();
-	omap2_clk_enable_autoidle_all();
-	amx3_common_pm_init();
+	omap_pm_soc_init = amx3_common_pm_init;
 }
 #endif
 
@@ -672,9 +629,7 @@ void __init omap4430_init_early(void)
 
 void __init omap4430_init_late(void)
 {
-	omap_common_late_init();
-	omap4_pm_init();
-	omap2_clk_enable_autoidle_all();
+	omap_pm_soc_init = omap4_pm_init;
 }
 #endif
 
@@ -700,9 +655,7 @@ void __init omap5_init_early(void)
 
 void __init omap5_init_late(void)
 {
-	omap_common_late_init();
-	omap4_pm_init();
-	omap2_clk_enable_autoidle_all();
+	omap_pm_soc_init = omap4_pm_init;
 }
 #endif
 
@@ -725,9 +678,7 @@ void __init dra7xx_init_early(void)
 
 void __init dra7xx_init_late(void)
 {
-	omap_common_late_init();
-	omap4_pm_init();
-	omap2_clk_enable_autoidle_all();
+	omap_pm_soc_init = omap4_pm_init;
 }
 #endif
 

arch/arm/mach-omap2/pm.c

@@ -230,8 +230,20 @@ static void __init omap4_init_voltages(void)
 	omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
 }
 
+int __maybe_unused omap_pm_nop_init(void)
+{
+	return 0;
+}
+
+int (*omap_pm_soc_init)(void);
+
 int __init omap2_common_pm_late_init(void)
 {
+	int error;
+
+	if (!omap_pm_soc_init)
+		return 0;
+
 	/* Init the voltage layer */
 	omap3_twl_init();
 	omap4_twl_init();
@@ -244,5 +256,12 @@ int __init omap2_common_pm_late_init(void)
 	/* Smartreflex device init */
 	omap_devinit_smartreflex();
 
+	error = omap_pm_soc_init();
+	if (error)
+		pr_warn("%s: pm soc init failed: %i\n", __func__, error);
+
+	omap2_clk_enable_autoidle_all();
+
 	return 0;
 }
+omap_late_initcall(omap2_common_pm_late_init);

arch/arm/mach-omap2/pm33xx-core.c

@@ -173,7 +173,7 @@ static struct am33xx_pm_platform_data *am33xx_pm_get_pdata(void)
 		return NULL;
 }
 
-void __init amx3_common_pm_init(void)
+int __init amx3_common_pm_init(void)
 {
 	struct am33xx_pm_platform_data *pdata;
 	struct platform_device_info devinfo;
@@ -186,4 +186,6 @@ void __init amx3_common_pm_init(void)
 	devinfo.size_data = sizeof(*pdata);
 	devinfo.id = -1;
 	platform_device_register_full(&devinfo);
+
+	return 0;
 }