[PATCH v2 1/3] drivers: net: xgene: Get channel number from device binding

[Iyappan Subramanian]

This patch gets ethernet to CPU channel (prefetch buffer number) from
the newly added 'channel' property, thus decoupling Linux driver from
resource management.

Signed-off-by: Iyappan Subramanian <isubraman...@apm.com>
---
 drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c 
b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
index 8d4c1ad..409152b 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
@@ -973,6 +973,17 @@ static enum xgene_ring_owner 
xgene_derive_ring_owner(struct xgene_enet_pdata *p)
        return owner;
 }
 
+static u8 xgene_start_cpu_bufnum(struct xgene_enet_pdata *pdata)
+{
+       struct device *dev = &pdata->pdev->dev;
+       u32 cpu_bufnum;
+       int ret;
+
+       ret = device_property_read_u32(dev, "channel", &cpu_bufnum);
+
+       return (!ret) ? cpu_bufnum : pdata->cpu_bufnum;
+}
+
 static int xgene_enet_create_desc_rings(struct net_device *ndev)
 {
        struct xgene_enet_pdata *pdata = netdev_priv(ndev);
@@ -981,13 +992,15 @@ static int xgene_enet_create_desc_rings(struct net_device 
*ndev)
        struct xgene_enet_desc_ring *buf_pool = NULL;
        enum xgene_ring_owner owner;
        dma_addr_t dma_exp_bufs;
-       u8 cpu_bufnum = pdata->cpu_bufnum;
+       u8 cpu_bufnum;
        u8 eth_bufnum = pdata->eth_bufnum;
        u8 bp_bufnum = pdata->bp_bufnum;
        u16 ring_num = pdata->ring_num;
        u16 ring_id;
        int i, ret, size;
 
+       cpu_bufnum = xgene_start_cpu_bufnum(pdata);
+
        for (i = 0; i < pdata->rxq_cnt; i++) {
                /* allocate rx descriptor ring */
                owner = xgene_derive_ring_owner(pdata);
-- 
1.9.1