nfc: nci: Add comment to explain NCI_HCI_MAX_PIPES

According to specification etsi 102 622 chapter 4.4 pipes
identifier is 7 bits long giving a 127 possible pipes value.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/net/nfc/nci_core.h b/include/net/nfc/nci_core.h
index 34a6e09b3f7f..d4dcc7199fd7 100644
--- a/include/net/nfc/nci_core.h
+++ b/include/net/nfc/nci_core.h
@@ -138,6 +138,10 @@ struct nci_conn_info {
 #define NCI_HCI_INVALID_HOST               0x80
 
 #define NCI_HCI_MAX_CUSTOM_GATES   50
+/*
+ * According to specification 102 622 chapter 4.4 Pipes,
+ * the pipe identifier is 7 bits long.
+ */
 #define NCI_HCI_MAX_PIPES          127
 
 struct nci_hci_gate {