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>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 879e29f48a89..fb846ebba1d9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -235,6 +235,9 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
                         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) {