omap5: Migrate CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC to Kconfig

While in theory this value could be used in places outside of "omap5"
(such as OMAP4), we only make use of it today in OMAP5, so place the
Kconfig entry there.  Given that Kconfig lets us provide a default, we
drop CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC entirely.  The contents of
doc/README.omap-reset-time make a good help entry, so adjust them
slightly and delete the file.  Move the comment about range to where we
use the value now, and have Kconfig enforce the upper bound.

Signed-off-by: Tom Rini <trini@konsulko.com>

README

@@ -3708,11 +3708,6 @@ Configuration Settings:
 	If defined, don't allow the -f switch to env set override variable
 	access flags.
 
-- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
-	This is set by OMAP boards for the max time that reset should
-	be asserted. See doc/README.omap-reset-time for details on how
-	the value can be calculated on a given board.
-
 - CONFIG_USE_STDINT
 	If stdint.h is available with your toolchain you can define this
 	option to enable it. You can provide option 'USE_STDINT=1' when

arch/arm/include/asm/arch-omap5/clock.h

@@ -370,13 +370,6 @@
 #define DPLL_NO_LOCK	0
 #define DPLL_LOCK	1
 
-/*
- * MAX value for PRM_RSTTIME[9:0]RSTTIME1 stored is 0x3ff.
- * 0x3ff is in the no of FUNC_32K_CLK cycles. Converting cycles
- * into microsec and passing the value.
- */
-#define CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC	31219
-
 #if defined(CONFIG_DRA7XX)
 #define V_OSCK			20000000	/* Clock output from T2 */
 #else

arch/arm/mach-omap2/omap5/Kconfig

@@ -63,6 +63,23 @@ config TI_SECURE_EMIF_PROTECTED_REGION_SIZE
 	  using hardware memory firewalls. This value must be smaller than the
 	  TI_SECURE_EMIF_TOTAL_REGION_SIZE value.
 
+config OMAP_PLATFORM_RESET_TIME_MAX_USEC
+	int "Something"
+	range 0  31219
+	default 31219
+	help
+	  Most OMAPs' provide a way to specify the time for which the reset
+	  should be held low while the voltages and Oscillator outputs
+	  stabilize.
+	  This time is mostly board and PMIC dependent. Hence the boards are
+	  expected to specify a pre-computed time using the above option.
+	  This value can be computed using a summation of the below 3
+	  parameters
+	  1: Time taken by the Osciallator to stop and restart
+	  2: PMIC OTP time
+	  3: Voltage ramp time, which can be derived using the PMIC slew rate
+	     and value of voltage ramp needed.
+
 if TARGET_DRA7XX_EVM || TARGET_AM57XX_EVM
 menu "Voltage Domain OPP selections"
 

arch/arm/mach-omap2/omap5/hwinit.c

@@ -414,12 +414,13 @@ void setup_warmreset_time(void)
 {
 	u32 rst_time, rst_val;
 
-#ifndef CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC
-	rst_time = CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC;
-#else
-	rst_time = CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC;
-#endif
-	rst_time = usec_to_32k(rst_time) << RSTTIME1_SHIFT;
+	/*
+	 * MAX value for PRM_RSTTIME[9:0]RSTTIME1 stored is 0x3ff.
+	 * 0x3ff is in the no of FUNC_32K_CLK cycles. Converting cycles
+	 * into microsec and passing the value.
+	 */
+	rst_time = usec_to_32k(CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC)
+		<< RSTTIME1_SHIFT;
 
 	if (rst_time > RSTTIME1_MASK)
 		rst_time = RSTTIME1_MASK;

configs/cm_t54_defconfig

@@ -2,6 +2,7 @@ CONFIG_ARM=y
 CONFIG_ARCH_OMAP2PLUS=y
 CONFIG_OMAP54XX=y
 CONFIG_TARGET_CM_T54=y
+CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC=16296
 # CONFIG_SPL_NAND_SUPPORT is not set
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_BOOTDELAY=3

configs/omap5_uevm_defconfig

@@ -2,6 +2,7 @@ CONFIG_ARM=y
 CONFIG_ARCH_OMAP2PLUS=y
 CONFIG_OMAP54XX=y
 CONFIG_TARGET_OMAP5_UEVM=y
+CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC=16296
 # CONFIG_SPL_NAND_SUPPORT is not set
 CONFIG_ARMV7_LPAE=y
 CONFIG_SYS_CONSOLE_INFO_QUIET=y

doc/README.omap-reset-time

@@ -1,20 +0,0 @@
-README on how reset time on OMAPs should be calculated
-
-CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC:
-Most OMAPs' provide a way to specify the time for
-which the reset should be held low while the voltages
-and Oscillator outputs stabilize.
-
-This time is mostly board and PMIC dependent. Hence the
-boards are expected to specify a pre-computed time
-using the above option, (the details on how to compute
-the value are given below) without which a default time
-as specified by CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC
-is used.
-
-The value for CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC
-can be computed using a summation of the below 3 parameters
--1- Time taken by the Osciallator to stop and restart
--2- PMIC OTP time
--3- Voltage ramp time, which can be derived using the
-PMIC slew rate and value of voltage ramp needed.

include/configs/cm_t54.h

@@ -86,9 +86,6 @@
 #define CONFIG_USB_ETHER_ASIX
 #define CONFIG_USB_ETHER_MCS7830
 
-/* Max time to hold reset on this board, see doc/README.omap-reset-time */
-#define CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC	16296
-
 /*
  * Miscellaneous configurable options
  */

include/configs/omap5_uevm.h

@@ -68,9 +68,6 @@
 
 #define CONSOLEDEV		"ttyO2"
 
-/* Max time to hold reset on this board, see doc/README.omap-reset-time */
-#define CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC	16296
-
 #define CONFIG_SCSI
 #define CONFIG_LIBATA
 #define CONFIG_SCSI_AHCI

scripts/config_whitelist.txt

@@ -617,7 +617,6 @@ CONFIG_DEEP_SLEEP
 CONFIG_DEFAULT
 CONFIG_DEFAULT_CONSOLE
 CONFIG_DEFAULT_IMMR
-CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC
 CONFIG_DEFAULT_SPI_BUS
 CONFIG_DEFAULT_SPI_CS
 CONFIG_DEFAULT_SPI_MODE
@@ -1999,7 +1998,6 @@ CONFIG_OMAP_EHCI_PHY1_RESET_GPIO
 CONFIG_OMAP_EHCI_PHY2_RESET_GPIO
 CONFIG_OMAP_EHCI_PHY3_RESET_GPIO
 CONFIG_OMAP_GPIO
-CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC
 CONFIG_OMAP_USB2PHY2_HOST
 CONFIG_OMAP_USB3PHY1_HOST
 CONFIG_OMAP_USB_PHY