Re: [PATCH net-next v2 1/8] ravb: Add struct ravb_hw_info to driver data

The DMAC and EMAC blocks of Gigabit Ethernet IP found on RZ/G2L SoC are
similar to the R-Car Ethernet AVB IP. With a few changes in the driver we
can support both IPs.

Currently a runtime decision based on the chip type is used to distinguish
the HW differences between the SoC families.

The number of TX descriptors for R-Car Gen3 is 1 whereas on R-Car Gen2 and
RZ/G2L it is 2. For cases like this it is better to select the number of
TX descriptors by using a structure with a value, rather than a runtime
decision based on the chip type.

This patch adds the num_tx_desc variable to struct ravb_hw_info and also
replaces the driver data chip type with struct ravb_hw_info by moving chip
type to it.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v2:
 * Incorporated Andrew and Sergei's review comments for making it smaller patch
   and provided detailed description.
---
 drivers/net/ethernet/renesas/ravb.h      |  7 +++++
 drivers/net/ethernet/renesas/ravb_main.c | 38 +++++++++++++++---------
 2 files changed, 31 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 80e62ca2e3d3..cfb972c05b34 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h

@@ -988,6 +988,11 @@ enum ravb_chip_id {
 	RCAR_GEN3,
 };
 
+struct ravb_hw_info {
+	enum ravb_chip_id chip_id;
+	int num_tx_desc;