staging: sm7xx: update comments and clarify supported chips

This patch updates/adds comments in order to clarify devices and Lynx
families supported for this driver.

Signed-off-by: Javier M. Mellid <jmunhoz@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/sm7xx/smtcfb.c b/drivers/staging/sm7xx/smtcfb.c
index 2c172d6..e7028a3 100644
--- a/drivers/staging/sm7xx/smtcfb.c
+++ b/drivers/staging/sm7xx/smtcfb.c
@@ -15,6 +15,7 @@
  * License. See the file COPYING in the main directory of this archive for
  * more details.
  *
+ * Framebuffer driver for Silicon Motion SM710, SM712, SM721 and SM722 chips
  */
 
 #include <linux/io.h>
@@ -758,7 +759,7 @@
 }
 
 /*
- * We need to wake up the LynxEM+, and make sure its in linear memory mode.
+ * We need to wake up the device and make sure its in linear memory mode.
  */
 static inline void sm7xx_init_hw(void)
 {
@@ -963,7 +964,11 @@
 	return err;
 }
 
-
+/*
+ * 0x710 (LynxEM)
+ * 0x712 (LynxEM+)
+ * 0x720 (Lynx3DM, Lynx3DM+)
+ */
 static DEFINE_PCI_DEVICE_TABLE(smtcfb_pci_table) = {
 	{ PCI_DEVICE(0x126f, 0x710), },
 	{ PCI_DEVICE(0x126f, 0x712), },
@@ -971,7 +976,6 @@
 	{0,}
 };
 
-
 static void __devexit smtcfb_pci_remove(struct pci_dev *pdev)
 {
 	struct smtcfb_info *sfb;