[PATCH net-next 6/7] net: stmmac: add documentation for stmmac_dma_cfg members

[Russell King (Oracle)]

Add documentation of each of the struct stmmac_dma_cfg members. dche
remains undocumented as I don't have documentation that covers this.

Signed-off-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>
---
 include/linux/stmmac.h | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 11886189bf51..3521b88aa345 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -93,16 +93,37 @@ struct stmmac_mdio_bus_data {
 };
 
 struct stmmac_dma_cfg {
+	/* pbl: programmable burst limit
+	 * txpbl: transmit programmable burst limit
+	 * rxpbl: receive programmable burst limit
+	 * If txpbl or rxpbl are zero, the value of pbl will be subsituted.
+	 * Range 0 - 63.
+	 */
 	int pbl;
 	int txpbl;
 	int rxpbl;
+	/* pblx8: multiplies pbl, txpbl, rxpbl by a factor of 8 for dwmac >=
+	 * 3.50a, or a factor of 4 for previous versions.
+	 */
 	bool pblx8;
+	/* fixed_burst:
+	 *  when set, AXI bursts defined by axi_blen_regval are permitted.
+	 *   AHB uses SINGLE, INCR4, INCR8 or INCR16 during burst transfers.
+	 *  when clear, AXI and AHB use SINGLE or INCR bursts.
+	 */
 	bool fixed_burst;
+	/* mixed_burst:
+	 *  when set and fixed_burst is clear, AHB uses INCR for bursts > 16
+	 *  and SINGLE or INCRx for bursts <= 16.
+	 */
 	bool mixed_burst;
+	/* aal: address aligned bursts for AHB and AXI master interface */
 	bool aal;
+	bool dche;
 	bool eame;
+	/* multi_msi_en: stmmac core internal */
 	bool multi_msi_en;
-	bool dche;
+	/* atds: stmmac core internal */
 	bool atds;
 };
 
-- 
2.47.3