[U-Boot] [PATCH] AT91: reset.c: fix comments, add option

[Reinhard Meyer]

- The comment was wrong/misleading
- One would assume that a u-boot "reset" command should also
reset the external hardware outside the SoC. Since its unknown
whether some boards rely on that NOT being so, asserting the
external reset signal is optional

Signed-off-by: Reinhard Meyer <u-boot at emk-elektronik.de>
---
 arch/arm/cpu/arm926ejs/at91/reset.c |   17 ++++++++---------
 1 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/arch/arm/cpu/arm926ejs/at91/reset.c b/arch/arm/cpu/arm926ejs/at91/reset.c
index 1b67e77..22f3277 100644
--- a/arch/arm/cpu/arm926ejs/at91/reset.c
+++ b/arch/arm/cpu/arm926ejs/at91/reset.c
@@ -27,18 +27,17 @@
 #include <asm/arch/at91_rstc.h>
 #include <asm/arch/io.h>
 
-/*
- * Reset the cpu by setting up the watchdog timer and let him time out.
- */
+/* Reset the cpu by telling the reset controller to do so */
 void reset_cpu(ulong ignored)
 {
 	at91_rstc_t *rstc = (at91_rstc_t *) AT91_RSTC_BASE;
 
-	/* this is the way Linux does it */
-
-	writel(AT91_RSTC_KEY | AT91_RSTC_CR_PROCRST | AT91_RSTC_CR_PERRST,
-		&rstc->cr);
-
+	writel(AT91_RSTC_KEY
+		| AT91_RSTC_CR_PROCRST	/* Processor Reset */
+		| AT91_RSTC_CR_PERRST	/* Peripheral Reset */
+#ifdef CONFIG_AT91RESET_EXTRST
+		| AT91_RSTC_CR_EXTRST	/* External Reset (assert nRST pin) */
+#endif
+		, &rstc->cr);
 	while (1);
-	/* Never reached */
 }
-- 
1.5.6.5