net: phy: ti: Add binding for the CLK_OUT pin muxing

The DP83867 has a muxing option for the CLK_OUT pin. It is possible
to set CLK_OUT for different channels.
Create a binding to select a specific clock for CLK_OUT pin.

Based on commit 9708fb630d19 ("net: phy: dp83867: Add binding for
the CLK_OUT pin muxing option") of mainline linux kernel.

Signed-off-by: Janine Hagemann <j.hagemann@phytec.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

diff --git a/doc/device-tree-bindings/net/ti,dp83867.txt b/doc/device-tree-bindings/net/ti,dp83867.txt
index f31c2da..034146f 100644 (file)
--- a/doc/device-tree-bindings/net/ti,dp83867.txt
+++ b/doc/device-tree-bindings/net/ti,dp83867.txt
@@ -12,6 +12,8 @@ Required properties:
                compensate for the board being designed with the lanes swapped.
        - enet-phy-no-lane-swap - Indicates that PHY will disable swap of the
                TX/RX lanes.
+       - ti,clk-output-sel - Clock output select - see dt-bindings/net/ti-dp83867.h
+               for applicable values
 
 Default child nodes are standard Ethernet PHY device
 nodes as described in doc/devicetree/bindings/net/ethernet.txt
@@ -24,6 +26,7 @@ Example:
                ti,tx-internal-delay = <DP83867_RGMIIDCTL_2_75_NS>;
                ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
                enet-phy-lane-no-swap;
+               ti,clk-output-sel = <DP83867_CLK_O_SEL_CHN_A_TCLK>;
        };
 
 Datasheet can be found:

diff --git a/drivers/net/phy/ti.c b/drivers/net/phy/ti.c
index e27ee32..6db6edd 100644 (file)
--- a/drivers/net/phy/ti.c
+++ b/drivers/net/phy/ti.c
@@ -93,6 +93,9 @@
 
 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MAX    0x0
 #define DP83867_IO_MUX_CFG_IO_IMPEDANCE_MIN    0x1f
+#define DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT     8
+#define DP83867_IO_MUX_CFG_CLK_O_SEL_MASK      \
+               GENMASK(0x1f, DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT)
 
 /* CFG4 bits */
 #define DP83867_CFG4_PORT_MIRROR_EN            BIT(0)
@@ -110,6 +113,7 @@ struct dp83867_private {
        int io_impedance;
        bool rxctrl_strap_quirk;
        int port_mirroring;
+       int clk_output_sel;
 };
 
 /**
@@ -208,6 +212,18 @@ static int dp83867_of_init(struct phy_device *phydev)
 {
        struct dp83867_private *dp83867 = phydev->priv;
        ofnode node;
+       u16 val;
+
+       /* Optional configuration */
+
+       /*
+        * Keep the default value if ti,clk-output-sel is not set
+        * or to high
+        */
+
+       dp83867->clk_output_sel =
+               ofnode_read_u32_default(node, "ti,clk-output-sel",
+                                       DP83867_CLK_O_SEL_REF_CLK);
 
        node = phy_get_ofnode(phydev);
        if (!ofnode_valid(node))
@@ -239,6 +255,17 @@ static int dp83867_of_init(struct phy_device *phydev)
                dp83867->port_mirroring = DP83867_PORT_MIRRORING_DIS;
 
 
+       /* Clock output selection if muxing property is set */
+       if (dp83867->clk_output_sel != DP83867_CLK_O_SEL_REF_CLK) {
+               val = phy_read_mmd_indirect(phydev, DP83867_IO_MUX_CFG,
+                                           DP83867_DEVADDR, phydev->addr);
+               val &= ~DP83867_IO_MUX_CFG_CLK_O_SEL_MASK;
+               val |= (dp83867->clk_output_sel <<
+                       DP83867_IO_MUX_CFG_CLK_O_SEL_SHIFT);
+               phy_write_mmd_indirect(phydev, DP83867_IO_MUX_CFG,
+                                      DP83867_DEVADDR, phydev->addr, val);
+       }
+
        return 0;
 }
 #else

diff --git a/include/dt-bindings/net/ti-dp83867.h b/include/dt-bindings/net/ti-dp83867.h
index b8e5df6..85d08f6 100644 (file)
--- a/include/dt-bindings/net/ti-dp83867.h
+++ b/include/dt-bindings/net/ti-dp83867.h
@@ -31,4 +31,19 @@
 #define DP83867_RGMIIDCTL_3_75_NS      0xe
 #define DP83867_RGMIIDCTL_4_00_NS      0xf
 
+/* IO_MUX_CFG - Clock output selection */
+#define DP83867_CLK_O_SEL_CHN_A_RCLK           0x0
+#define DP83867_CLK_O_SEL_CHN_B_RCLK           0x1
+#define DP83867_CLK_O_SEL_CHN_C_RCLK           0x2
+#define DP83867_CLK_O_SEL_CHN_D_RCLK           0x3
+#define DP83867_CLK_O_SEL_CHN_A_RCLK_DIV5      0x4
+#define DP83867_CLK_O_SEL_CHN_B_RCLK_DIV5      0x5
+#define DP83867_CLK_O_SEL_CHN_C_RCLK_DIV5      0x6
+#define DP83867_CLK_O_SEL_CHN_D_RCLK_DIV5      0x7
+#define DP83867_CLK_O_SEL_CHN_A_TCLK           0x8
+#define DP83867_CLK_O_SEL_CHN_B_TCLK           0x9
+#define DP83867_CLK_O_SEL_CHN_C_TCLK           0xA
+#define DP83867_CLK_O_SEL_CHN_D_TCLK           0xB
+#define DP83867_CLK_O_SEL_REF_CLK              0xC
+
 #endif