[PATCH net-next v3 9/9] net: stmmac: qcom-ethqos: add Shikra EMAC support

[Mohd Ayaan Anwar]

Shikra integrates two Qualcomm ETHQOS controllers based on the Synopsys
GMAC IP, similar to previous platforms.  Register qcom,shikra-ethqos
backed by a new shikra_data descriptor that enables the three NOC clocks
required for DMA memory access (axi-noc, pcie-tile-axi-noc, stmmaceth),
and the 36-bit DMA address width.

The NOC clock rates are set using an OPP table. As part of the NOC
clock voting logic, the qcom-ethqos glue driver takes a second enable
reference on the "stmmaceth" clock, which is already enabled by the
stmmac core. Since, all three clocks must run at 120 MHzs, managing
"stmmaceth" through the same clk_bulk path keeps the rate-setting and
enable/disable together.

Signed-off-by: Mohd Ayaan Anwar <mohd.anwar at oss.qualcomm.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 9c602755532e141f4b822721686b1481b29b7d4c..a4e083a8517d095e5571b1340f9dd4b5e0c6e81f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -307,6 +307,22 @@ static const struct ethqos_emac_driver_data emac_v4_0_0_data = {
 	.dwmac4_addrs = &ethqos_dwmac4_addrs,
 };
 
+static const char * const shikra_noc_clk_names[] = {
+	"stmmaceth",
+	"axi-noc",
+	"pcie-tile-axi-noc",
+	NULL,
+};
+
+static const struct ethqos_emac_driver_data shikra_data = {
+	.dma_addr_width = 36,
+	.has_emac_ge_3 = true,
+	.noc_clk_names = shikra_noc_clk_names,
+	.num_noc_clks = ARRAY_SIZE(shikra_noc_clk_names) - 1,
+	.rgmii_config_loopback_en = false,
+	.dwmac4_addrs = &ethqos_dwmac4_addrs,
+};
+
 static int ethqos_dll_configure(struct qcom_ethqos *ethqos)
 {
 	struct device *dev = &ethqos->pdev->dev;
@@ -947,6 +963,7 @@ static const struct of_device_id qcom_ethqos_match[] = {
 	{ .compatible = "qcom,qcs404-ethqos", .data = &emac_v2_3_0_data},
 	{ .compatible = "qcom,sa8775p-ethqos", .data = &emac_v4_0_0_data},
 	{ .compatible = "qcom,sc8280xp-ethqos", .data = &emac_v3_0_0_data},
+	{ .compatible = "qcom,shikra-ethqos", .data = &shikra_data},
 	{ .compatible = "qcom,sm8150-ethqos", .data = &emac_v2_1_0_data},
 	{ }
 };

-- 
2.34.1