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 c41afd963edf508f36c57f125d092efc282c0429..8ca65cec52ae8cc25e8231891a159c9525297391 100644 (file)
--- a/Documentation/devicetree/bindings/net/stmmac.txt
+++ b/Documentation/devicetree/bindings/net/stmmac.txt
@@ -43,6 +43,7 @@ Optional properties:
   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 879e29f48a8933002c291635dce0cf75785b99d1..fb846ebba1d9b0860acf920356aedfaf9d967f27 100644 (file)
--- 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) {