[PATCH net-next v3 0/3] net: mscc-miim: add integrated PHY reset support

[PATCH net-next v3 0/3] net: mscc-miim: add integrated PHY reset support

[Michael Walle]

The MDIO driver has support to release the integrated PHYs from reset.
This was implemented for the SparX-5 for now. Now add support for the
LAN966x, too.

changes since v2:
 - fix typo in commit message
 - use microchip,lan966x instead of mscc,lan966x
 - rename mask variable to {phy_,}reset_bits
 - check return code from device_get_match_data() right after
   the call instead of checking it where it is used

changes since v1:
 - fix typo in the subject in patch 3/3

Michael Walle (3):
  dt-bindings: net: mscc-miim: add lan966x compatible
  net: mdio: mscc-miim: replace magic numbers for the bus reset
  net: mdio: mscc-miim: add lan966x internal phy reset support

 .../devicetree/bindings/net/mscc-miim.txt     |  2 +-
 drivers/net/mdio/mdio-mscc-miim.c             | 67 ++++++++++++++-----
 2 files changed, 50 insertions(+), 19 deletions(-)

-- 
2.30.2

[PATCH net-next v3 1/3] dt-bindings: net: mscc-miim: add lan966x compatible

[Michael Walle]

The MDIO controller has support to release the internal PHYs from reset
by specifying a second memory resource. This is different between the
currently supported SparX-5 and the LAN966x. Add a new compatible to
distinguish between these two.

Signed-off-by: Michael Walle <michael@walle.cc>
Acked-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 Documentation/devicetree/bindings/net/mscc-miim.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/mscc-miim.txt b/Documentation/devicetree/bindings/net/mscc-miim.txt
index 7104679cf59d..70e0cb1ee485 100644
--- a/Documentation/devicetree/bindings/net/mscc-miim.txt
+++ b/Documentation/devicetree/bindings/net/mscc-miim.txt
@@ -2,7 +2,7 @@ Microsemi MII Management Controller (MIIM) / MDIO
 =================================================
 
 Properties:
-- compatible: must be "mscc,ocelot-miim"
+- compatible: must be "mscc,ocelot-miim" or "microchip,lan966x-miim"
 - reg: The base address of the MDIO bus controller register bank. Optionally, a
   second register bank can be defined if there is an associated reset register
   for internal PHYs
-- 
2.30.2

[PATCH net-next v3 2/3] net: mdio: mscc-miim: replace magic numbers for the bus reset

[Michael Walle]

Replace the magic numbers by macros which are already defined. It seems
the original commit missed to use them.

Signed-off-by: Michael Walle <michael@walle.cc>
---
 drivers/net/mdio/mdio-mscc-miim.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
index 64fb76c1e395..2f77bf75288d 100644
--- a/drivers/net/mdio/mdio-mscc-miim.c
+++ b/drivers/net/mdio/mdio-mscc-miim.c
@@ -158,18 +158,18 @@ static int mscc_miim_reset(struct mii_bus *bus)
 {
 	struct mscc_miim_dev *miim = bus->priv;
 	int offset = miim->phy_reset_offset;
+	int reset_bits = PHY_CFG_PHY_ENA | PHY_CFG_PHY_COMMON_RESET |
+			 PHY_CFG_PHY_RESET;
 	int ret;
 
 	if (miim->phy_regs) {
-		ret = regmap_write(miim->phy_regs,
-				   MSCC_PHY_REG_PHY_CFG + offset, 0);
+		ret = regmap_write(miim->phy_regs, offset, 0);
 		if (ret < 0) {
 			WARN_ONCE(1, "mscc reset set error %d\n", ret);
 			return ret;
 		}
 
-		ret = regmap_write(miim->phy_regs,
-				   MSCC_PHY_REG_PHY_CFG + offset, 0x1ff);
+		ret = regmap_write(miim->phy_regs, offset, reset_bits);
 		if (ret < 0) {
 			WARN_ONCE(1, "mscc reset clear error %d\n", ret);
 			return ret;
@@ -272,7 +272,7 @@ static int mscc_miim_probe(struct platform_device *pdev)
 
 	miim = bus->priv;
 	miim->phy_regs = phy_regmap;
-	miim->phy_reset_offset = 0;
+	miim->phy_reset_offset = MSCC_PHY_REG_PHY_CFG;
 
 	ret = of_mdiobus_register(bus, pdev->dev.of_node);
 	if (ret < 0) {
-- 
2.30.2

Re: [PATCH net-next v3 2/3] net: mdio: mscc-miim: replace magic numbers for the bus reset

[Andrew Lunn]

On Fri, Mar 18, 2022 at 09:13:23PM +0100, Michael Walle wrote:
> Replace the magic numbers by macros which are already defined. It seems
> the original commit missed to use them.
> 
> Signed-off-by: Michael Walle <michael@walle.cc>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

[PATCH net-next v3 3/3] net: mdio: mscc-miim: add lan966x internal phy reset support

[Michael Walle]

The LAN966x has two internal PHYs which are in reset by default. The
driver already supported the internal PHYs of the SparX-5. Now add
support for the LAN966x, too. Add a new compatible to distinguish them.

The LAN966x has additional control bits in this register, thus convert
the regmap_write() to regmap_update_bits() to leave the remaining bits
untouched. This doesn't change anything for the SparX-5 SoC, because
there, the register consists only of reset bits.

Signed-off-by: Michael Walle <michael@walle.cc>
---
 drivers/net/mdio/mdio-mscc-miim.c | 67 ++++++++++++++++++++++---------
 1 file changed, 49 insertions(+), 18 deletions(-)

diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
index 2f77bf75288d..c483ba67c21f 100644
--- a/drivers/net/mdio/mdio-mscc-miim.c
+++ b/drivers/net/mdio/mdio-mscc-miim.c
@@ -15,6 +15,7 @@
 #include <linux/of_mdio.h>
 #include <linux/phy.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 
 #define MSCC_MIIM_REG_STATUS		0x0
@@ -36,11 +37,19 @@
 #define		PHY_CFG_PHY_RESET	(BIT(5) | BIT(6) | BIT(7) | BIT(8))
 #define MSCC_PHY_REG_PHY_STATUS	0x4
 
+#define LAN966X_CUPHY_COMMON_CFG	0x0
+#define		CUPHY_COMMON_CFG_RESET_N	BIT(0)
+
+struct mscc_miim_info {
+	unsigned int phy_reset_offset;
+	unsigned int phy_reset_bits;
+};
+
 struct mscc_miim_dev {
 	struct regmap *regs;
 	int mii_status_offset;
 	struct regmap *phy_regs;
-	int phy_reset_offset;
+	const struct mscc_miim_info *info;
 };
 
 /* When high resolution timers aren't built-in: we can't use usleep_range() as
@@ -157,27 +166,29 @@ static int mscc_miim_write(struct mii_bus *bus, int mii_id,
 static int mscc_miim_reset(struct mii_bus *bus)
 {
 	struct mscc_miim_dev *miim = bus->priv;
-	int offset = miim->phy_reset_offset;
-	int reset_bits = PHY_CFG_PHY_ENA | PHY_CFG_PHY_COMMON_RESET |
-			 PHY_CFG_PHY_RESET;
+	unsigned int offset, bits;
 	int ret;
 
-	if (miim->phy_regs) {
-		ret = regmap_write(miim->phy_regs, offset, 0);
-		if (ret < 0) {
-			WARN_ONCE(1, "mscc reset set error %d\n", ret);
-			return ret;
-		}
+	if (!miim->phy_regs)
+		return 0;
 
-		ret = regmap_write(miim->phy_regs, offset, reset_bits);
-		if (ret < 0) {
-			WARN_ONCE(1, "mscc reset clear error %d\n", ret);
-			return ret;
-		}
+	offset = miim->info->phy_reset_offset;
+	bits = miim->info->phy_reset_bits;
+
+	ret = regmap_update_bits(miim->phy_regs, offset, bits, 0);
+	if (ret < 0) {
+		WARN_ONCE(1, "mscc reset set error %d\n", ret);
+		return ret;
+	}
 
-		mdelay(500);
+	ret = regmap_update_bits(miim->phy_regs, offset, bits, bits);
+	if (ret < 0) {
+		WARN_ONCE(1, "mscc reset clear error %d\n", ret);
+		return ret;
 	}
 
+	mdelay(500);
+
 	return 0;
 }
 
@@ -272,7 +283,10 @@ static int mscc_miim_probe(struct platform_device *pdev)
 
 	miim = bus->priv;
 	miim->phy_regs = phy_regmap;
-	miim->phy_reset_offset = MSCC_PHY_REG_PHY_CFG;
+
+	miim->info = device_get_match_data(&pdev->dev);
+	if (!miim->info)
+		return -EINVAL;
 
 	ret = of_mdiobus_register(bus, pdev->dev.of_node);
 	if (ret < 0) {
@@ -294,8 +308,25 @@ static int mscc_miim_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct mscc_miim_info mscc_ocelot_miim_info = {
+	.phy_reset_offset = MSCC_PHY_REG_PHY_CFG,
+	.phy_reset_bits = PHY_CFG_PHY_ENA | PHY_CFG_PHY_COMMON_RESET |
+			  PHY_CFG_PHY_RESET,
+};
+
+static const struct mscc_miim_info microchip_lan966x_miim_info = {
+	.phy_reset_offset = LAN966X_CUPHY_COMMON_CFG,
+	.phy_reset_bits = CUPHY_COMMON_CFG_RESET_N,
+};
+
 static const struct of_device_id mscc_miim_match[] = {
-	{ .compatible = "mscc,ocelot-miim" },
+	{
+		.compatible = "mscc,ocelot-miim",
+		.data = &mscc_ocelot_miim_info
+	}, {
+		.compatible = "microchip,lan966x-miim",
+		.data = &microchip_lan966x_miim_info
+	},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, mscc_miim_match);
-- 
2.30.2

Re: [PATCH net-next v3 3/3] net: mdio: mscc-miim: add lan966x internal phy reset support

[Andrew Lunn]

On Fri, Mar 18, 2022 at 09:13:24PM +0100, Michael Walle wrote:
> The LAN966x has two internal PHYs which are in reset by default. The
> driver already supported the internal PHYs of the SparX-5. Now add
> support for the LAN966x, too. Add a new compatible to distinguish them.
> 
> The LAN966x has additional control bits in this register, thus convert
> the regmap_write() to regmap_update_bits() to leave the remaining bits
> untouched. This doesn't change anything for the SparX-5 SoC, because
> there, the register consists only of reset bits.
> 
> Signed-off-by: Michael Walle <michael@walle.cc>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew

Re: [PATCH net-next v3 0/3] net: mscc-miim: add integrated PHY reset support

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Fri, 18 Mar 2022 21:13:21 +0100 you wrote:
> The MDIO driver has support to release the integrated PHYs from reset.
> This was implemented for the SparX-5 for now. Now add support for the
> LAN966x, too.
> 
> changes since v2:
>  - fix typo in commit message
>  - use microchip,lan966x instead of mscc,lan966x
>  - rename mask variable to {phy_,}reset_bits
>  - check return code from device_get_match_data() right after
>    the call instead of checking it where it is used
> 
> [...]

Here is the summary with links:
  - [net-next,v3,1/3] dt-bindings: net: mscc-miim: add lan966x compatible
    https://git.kernel.org/netdev/net-next/c/a2e4b5adfdf8
  - [net-next,v3,2/3] net: mdio: mscc-miim: replace magic numbers for the bus reset
    https://git.kernel.org/netdev/net-next/c/58ebdba3d851
  - [net-next,v3,3/3] net: mdio: mscc-miim: add lan966x internal phy reset support
    https://git.kernel.org/netdev/net-next/c/74529db3e01d

You are awesome, thank you!
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