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From: Thierry Reding <thierry.reding@gmail.com>
Date: Fri, 02 Feb 2024 12:53:34 +0100
Subject: [PATCH net-next v2 2/3] net: stmmac: Allow drivers to provide a
 default AXI configuration
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Message-Id: <20240202-stmmac-axi-config-v2-2-64eab2bab17b@nvidia.com>
References: <20240202-stmmac-axi-config-v2-0-64eab2bab17b@nvidia.com>
In-Reply-To: <20240202-stmmac-axi-config-v2-0-64eab2bab17b@nvidia.com>
To: Alexandre Torgue <alexandre.torgue@foss.st.com>, 
 Jose Abreu <joabreu@synopsys.com>, "David S. Miller" <davem@davemloft.net>, 
 Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, 
 Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, 
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, 
 linux-tegra@vger.kernel.org

From: Thierry Reding <treding@nvidia.com>

In many cases the AXI configuration can be derived from the compatible
string, so there's no need to add the configuration to DT. Allow drivers
to pass in the default AXI configuration so they can be properly set up
without extra data in DT.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
Changes in v2:
- fix bisectability
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h       |  2 +
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  | 47 ++++++++++++++--------
 2 files changed, 33 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index f155e4841c62..07706e7b3cfc 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -35,6 +35,8 @@ struct stmmac_resources {
 	int sfty_ue_irq;
 	int rx_irq[MTL_MAX_RX_QUEUES];
 	int tx_irq[MTL_MAX_TX_QUEUES];
+
+	const struct stmmac_axi *axi;
 };
 
 enum stmmac_txbuf_type {
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 650ec8d2f5d7..0d5f2cebd6fc 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -91,34 +91,49 @@ static int dwmac1000_validate_ucast_entries(struct device *dev,
  * if required, from device-tree the AXI internal register can be tuned
  * by using platform parameters.
  */
-static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev)
+static struct stmmac_axi *stmmac_axi_setup(struct platform_device *pdev,
+					   struct stmmac_resources *res)
 {
 	struct device_node *np;
 	struct stmmac_axi *axi;
 
 	np = of_parse_phandle(pdev->dev.of_node, "snps,axi-config", 0);
-	if (!np)
+	if (!np && !res->axi)
 		return NULL;
 
 	axi = devm_kzalloc(&pdev->dev, sizeof(*axi), GFP_KERNEL);
 	if (!axi) {
-		of_node_put(np);
+		if (np)
+			of_node_put(np);
+
 		return ERR_PTR(-ENOMEM);
 	}
 
-	axi->axi_lpi_en = of_property_read_bool(np, "snps,lpi_en");
-	axi->axi_xit_frm = of_property_read_bool(np, "snps,xit_frm");
-	axi->axi_kbbe = of_property_read_bool(np, "snps,kbbe");
-	axi->axi_fb = of_property_read_bool(np, "snps,fb");
-	axi->axi_mb = of_property_read_bool(np, "snps,mb");
-	axi->axi_rb =  of_property_read_bool(np, "snps,rb");
+	if (res->axi)
+		*axi = *res->axi;
+
+	if (np) {
+		axi->axi_lpi_en = of_property_read_bool(np, "snps,lpi_en");
+		axi->axi_xit_frm = of_property_read_bool(np, "snps,xit_frm");
+		axi->axi_kbbe = of_property_read_bool(np, "snps,kbbe");
+		axi->axi_fb = of_property_read_bool(np, "snps,fb");
+		axi->axi_mb = of_property_read_bool(np, "snps,mb");
+		axi->axi_rb =  of_property_read_bool(np, "snps,rb");
+
+		if (of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt)) {
+			if (!res->axi)
+				axi->axi_wr_osr_lmt = 1;
+		}
+
+		if (of_property_read_u32(np, "snps,rd_osr_lmt", &axi->axi_rd_osr_lmt)) {
+			if (!res->axi)
+				axi->axi_rd_osr_lmt = 1;
+		}
+
+		of_property_read_u32_array(np, "snps,blen", axi->axi_blen, AXI_BLEN);
 
-	if (of_property_read_u32(np, "snps,wr_osr_lmt", &axi->axi_wr_osr_lmt))
-		axi->axi_wr_osr_lmt = 1;
-	if (of_property_read_u32(np, "snps,rd_osr_lmt", &axi->axi_rd_osr_lmt))
-		axi->axi_rd_osr_lmt = 1;
-	of_property_read_u32_array(np, "snps,blen", axi->axi_blen, AXI_BLEN);
-	of_node_put(np);
+		of_node_put(np);
+	}
 
 	return axi;
 }
@@ -606,7 +621,7 @@ stmmac_probe_config_dt(struct platform_device *pdev,
 
 	of_property_read_u32(np, "snps,ps-speed", &plat->mac_port_sel_speed);
 
-	plat->axi = stmmac_axi_setup(pdev);
+	plat->axi = stmmac_axi_setup(pdev, res);
 
 	rc = stmmac_mtl_setup(pdev, plat);
 	if (rc) {

-- 
2.43.0