[PATCH net-next v3 1/2] net: dsa: vsc73xx: make RGMII delays configurable

[PATCH net-next v3 1/2] net: dsa: vsc73xx: make RGMII delays configurable

[Pawel Dembicki]

This patch switches hardcoded RGMII transmit/receive delay to
a configurable value. Delay values are taken from the properties of
the CPU port: 'tx-internal-delay-ps' and 'rx-internal-delay-ps'.

The default value is configured to 2.0 ns to maintain backward
compatibility with existing code.

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>

---
v3:
  - added 'Reviewed-by:' only
v2:
  - return -EINVAL when value is wrong
  - info about default value are silenced
---
 drivers/net/dsa/vitesse-vsc73xx-core.c | 70 ++++++++++++++++++++++++--
 1 file changed, 66 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index d9d3e30fd47a..07b704a1557e 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -684,6 +684,67 @@ vsc73xx_update_vlan_table(struct vsc73xx *vsc, int port, u16 vid, bool set)
 	return vsc73xx_write_vlan_table_entry(vsc, vid, portmap);
 }
 
+static int vsc73xx_configure_rgmii_port_delay(struct dsa_switch *ds)
+{
+	/* Keep 2.0 ns delay for backward complatibility */
+	u32 tx_delay = VSC73XX_GMIIDELAY_GMII0_GTXDELAY_2_0_NS;
+	u32 rx_delay = VSC73XX_GMIIDELAY_GMII0_RXDELAY_2_0_NS;
+	struct dsa_port *dp = dsa_to_port(ds, CPU_PORT);
+	struct device_node *port_dn = dp->dn;
+	struct vsc73xx *vsc = ds->priv;
+	u32 delay;
+
+	if (!of_property_read_u32(port_dn, "tx-internal-delay-ps", &delay)) {
+		switch (delay) {
+		case 0:
+			tx_delay = VSC73XX_GMIIDELAY_GMII0_GTXDELAY_NONE;
+			break;
+		case 1400:
+			tx_delay = VSC73XX_GMIIDELAY_GMII0_GTXDELAY_1_4_NS;
+			break;
+		case 1700:
+			tx_delay = VSC73XX_GMIIDELAY_GMII0_GTXDELAY_1_7_NS;
+			break;
+		case 2000:
+			break;
+		default:
+			dev_err(vsc->dev,
+				"Unsupported RGMII Transmit Clock Delay\n");
+			return -EINVAL;
+		}
+	} else {
+		dev_dbg(vsc->dev,
+			"RGMII Transmit Clock Delay isn't configured, set to 2.0 ns\n");
+	}
+
+	if (!of_property_read_u32(port_dn, "rx-internal-delay-ps", &delay)) {
+		switch (delay) {
+		case 0:
+			rx_delay = VSC73XX_GMIIDELAY_GMII0_RXDELAY_NONE;
+			break;
+		case 1400:
+			rx_delay = VSC73XX_GMIIDELAY_GMII0_RXDELAY_1_4_NS;
+			break;
+		case 1700:
+			rx_delay = VSC73XX_GMIIDELAY_GMII0_RXDELAY_1_7_NS;
+			break;
+		case 2000:
+			break;
+		default:
+			dev_err(vsc->dev,
+				"Unsupported RGMII Receive Clock Delay value\n");
+			return -EINVAL;
+		}
+	} else {
+		dev_dbg(vsc->dev,
+			"RGMII Receive Clock Delay isn't configured, set to 2.0 ns\n");
+	}
+
+	/* MII delay, set both GTX and RX delay */
+	return vsc73xx_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_GMIIDELAY,
+			     tx_delay | rx_delay);
+}
+
 static int vsc73xx_setup(struct dsa_switch *ds)
 {
 	struct vsc73xx *vsc = ds->priv;
@@ -746,10 +807,11 @@ static int vsc73xx_setup(struct dsa_switch *ds)
 			      VSC73XX_MAC_CFG, VSC73XX_MAC_CFG_RESET);
 	}
 
-	/* MII delay, set both GTX and RX delay to 2 ns */
-	vsc73xx_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_GMIIDELAY,
-		      VSC73XX_GMIIDELAY_GMII0_GTXDELAY_2_0_NS |
-		      VSC73XX_GMIIDELAY_GMII0_RXDELAY_2_0_NS);
+	/* Configure RGMII delay */
+	ret = vsc73xx_configure_rgmii_port_delay(ds);
+	if (ret)
+		return ret;
+
 	/* Ingess VLAN reception mask (table 145) */
 	vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANMASK,
 		      0xff);
-- 
2.34.1

[PATCH net-next v3 2/2] dt-bindings: net: dsa: vsc73xx: add {rx,tx}-internal-delay-ps

[Pawel Dembicki]

Add a schema validator to vitesse,vsc73xx.yaml for MAC-level RGMII delays
in the CPU port. Additionally, valid values for VSC73XX were defined,
and a common definition for the RX and TX valid range was created.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>

---
v3:
  - use 'default:' instead text in description
v2:
  - added info about default value when the rx/tx delay property
    is missing
---
 .../bindings/net/dsa/vitesse,vsc73xx.yaml     | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/dsa/vitesse,vsc73xx.yaml b/Documentation/devicetree/bindings/net/dsa/vitesse,vsc73xx.yaml
index b99d7a694b70..51cf574249be 100644
--- a/Documentation/devicetree/bindings/net/dsa/vitesse,vsc73xx.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/vitesse,vsc73xx.yaml
@@ -52,6 +52,25 @@ properties:
 allOf:
   - $ref: dsa.yaml#/$defs/ethernet-ports
 
+patternProperties:
+  "^(ethernet-)?ports$":
+    additionalProperties: true
+    patternProperties:
+      "^(ethernet-)?port@6$":
+        allOf:
+          - if:
+              properties:
+                phy-mode:
+                  contains:
+                    enum:
+                      - rgmii
+            then:
+              properties:
+                rx-internal-delay-ps:
+                  $ref: "#/$defs/internal-delay-ps"
+                tx-internal-delay-ps:
+                  $ref: "#/$defs/internal-delay-ps"
+
 # This checks if reg is a chipselect so the device is on an SPI
 # bus, the if-clause will fail if reg is a tuple such as for a
 # platform device.
@@ -67,6 +86,15 @@ required:
   - compatible
   - reg
 
+$defs:
+  internal-delay-ps:
+    description:
+      Disable tunable delay lines using 0 ps, or enable them and select
+      the phase between 1400 ps and 2000 ps in increments of 300 ps.
+    default: 2000
+    enum:
+      [0, 1400, 1700, 2000]
+
 unevaluatedProperties: false
 
 examples:
@@ -108,6 +136,8 @@ examples:
             reg = <6>;
             ethernet = <&gmac1>;
             phy-mode = "rgmii";
+            rx-internal-delay-ps = <0>;
+            tx-internal-delay-ps = <0>;
             fixed-link {
               speed = <1000>;
               full-duplex;
@@ -150,6 +180,8 @@ examples:
           ethernet-port@6 {
             reg = <6>;
             ethernet = <&enet0>;
+            rx-internal-delay-ps = <0>;
+            tx-internal-delay-ps = <0>;
             phy-mode = "rgmii";
             fixed-link {
               speed = <1000>;
-- 
2.34.1

Re: [PATCH net-next v3 2/2] dt-bindings: net: dsa: vsc73xx: add {rx,tx}-internal-delay-ps

[Rob Herring (Arm)]

On Mon, 29 Jul 2024 23:02:01 +0200, Pawel Dembicki wrote:
> Add a schema validator to vitesse,vsc73xx.yaml for MAC-level RGMII delays
> in the CPU port. Additionally, valid values for VSC73XX were defined,
> and a common definition for the RX and TX valid range was created.
> 
> Reviewed-by: Andrew Lunn <andrew@lunn.ch>
> Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
> 
> ---
> v3:
>   - use 'default:' instead text in description
> v2:
>   - added info about default value when the rx/tx delay property
>     is missing
> ---
>  .../bindings/net/dsa/vitesse,vsc73xx.yaml     | 32 +++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>

Re: [PATCH net-next v3 2/2] dt-bindings: net: dsa: vsc73xx: add {rx,tx}-internal-delay-ps

[Linus Walleij]

On Mon, Jul 29, 2024 at 11:02 PM Pawel Dembicki <paweldembicki@gmail.com> wrote:

> Add a schema validator to vitesse,vsc73xx.yaml for MAC-level RGMII delays
> in the CPU port. Additionally, valid values for VSC73XX were defined,
> and a common definition for the RX and TX valid range was created.
>
> Reviewed-by: Andrew Lunn <andrew@lunn.ch>
> Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>

Elegant!
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

Re: [PATCH net-next v3 1/2] net: dsa: vsc73xx: make RGMII delays configurable

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by David S. Miller <davem@davemloft.net>:

On Mon, 29 Jul 2024 23:01:59 +0200 you wrote:
> This patch switches hardcoded RGMII transmit/receive delay to
> a configurable value. Delay values are taken from the properties of
> the CPU port: 'tx-internal-delay-ps' and 'rx-internal-delay-ps'.
> 
> The default value is configured to 2.0 ns to maintain backward
> compatibility with existing code.
> 
> [...]

Here is the summary with links:
  - [net-next,v3,1/2] net: dsa: vsc73xx: make RGMII delays configurable
    https://git.kernel.org/netdev/net-next/c/3b91b03271c5
  - [net-next,v3,2/2] dt-bindings: net: dsa: vsc73xx: add {rx,tx}-internal-delay-ps
    https://git.kernel.org/netdev/net-next/c/b735154aeb33

You are awesome, thank you!
-- 
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