stmmac: Add an optional device tree property "snps,burst_len"
This property define the AXI bug lenth.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
index c41afd9..8ca65ce 100644
--- a/Documentation/devicetree/bindings/net/stmmac.txt
+++ b/Documentation/devicetree/bindings/net/stmmac.txt
@@ -43,6 +43,7 @@
available this clock is used for programming the Timestamp Addend Register.
If not passed then the system clock will be used and this is fine on some
platforms.
+- snps,burst_len: The AXI burst lenth value of the AXI BUS MODE register.
Examples:
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 879e29f..fb846eb 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -235,6 +235,9 @@
of_property_read_bool(np, "snps,fixed-burst");
dma_cfg->mixed_burst =
of_property_read_bool(np, "snps,mixed-burst");
+ of_property_read_u32(np, "snps,burst_len", &dma_cfg->burst_len);
+ if (dma_cfg->burst_len < 0 || dma_cfg->burst_len > 256)
+ dma_cfg->burst_len = 0;
}
plat->force_thresh_dma_mode = of_property_read_bool(np, "snps,force_thresh_dma_mode");
if (plat->force_thresh_dma_mode) {
