[PATCH] ARM: i.MX7: Warp7: Add some code comments

[Uwe Kleine-König]

This makes it easier to understand what is done and adapt this code for
other boards. My editor also added a newline at eof which is good.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
 arch/arm/boards/element14-warp7/lowlevel.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boards/element14-warp7/lowlevel.c b/arch/arm/boards/element14-warp7/lowlevel.c
index 38b7745f64ea..89a77d2f88ea 100644
--- a/arch/arm/boards/element14-warp7/lowlevel.c
+++ b/arch/arm/boards/element14-warp7/lowlevel.c
@@ -17,10 +17,16 @@ static noinline void warp7_start(void)
 	void __iomem *ccmbase = IOMEM(MX7_CCM_BASE_ADDR);
 	void *fdt;
 
+	/* CCM_CCGR148_CLR, uart1 */
 	writel(0x3, ccmbase + 0x4000 + 16 * 148 + 0x8);
+	/* CCM_TARGET_ROOT95 = UART1_CLK_ROOT */
 	writel(0x10000000, ccmbase + 0x8000 + 128 * 95);
+	/* CCM_CCGR148_SET, uart1 */
 	writel(0x3, ccmbase + 0x4000 + 16 * 148 + 0x4);
+
+	/* MX7D_PAD_UART1_RX_DATA__UART1_DCE_RX without daisy chaining */
 	writel(0x0, iomuxbase + 0x128);
+	/* MX7D_PAD_UART1_TX_DATA__UART1_DCE_TX */
 	writel(0x0, iomuxbase + 0x12c);
 
 	imx7_uart_setup(uart);
@@ -45,4 +51,4 @@ ENTRY_FUNCTION(start_imx7s_element14_warp7, r0, r1, r2)
 	barrier();
 
 	warp7_start();
-}
\ No newline at end of file
+}
-- 
2.11.0