[PATCH v7 0/4] Rx mode support for Cadence DPHY

[PATCH v7 0/4] Rx mode support for Cadence DPHY

[Pratyush Yadav]

Hi,

This series adds support for Cadence DPHY Rx driver. It has been split
off from [0] to facilitate easier merging. I have still kept the version
number to maintain continuity with the previous patches. The earlier
version used the same binding for Tx and Rx DPHY. With the separate
driver, I have added a separate binding. But I am still keeping the old
conversion patch in this series since I have already done the work in
converting the binding to yaml, might as well get it merged.

Tested on TI's J721E with OV5640 sensor.

[0] https://patchwork.linuxtv.org/project/linux-media/list/?series=5526&state=%2A&archive=both

Changes in v7:
- Add spaces after { and before } in the bands table.
- Drop the wrapping around the for loop on cdns_dphy_rx_get_band_ctrl().
- Make cdns_dphy_rx_wait_for_bit() inline.
- Print an error message if registering PHY provider fails.

Changes in v6:
- Add a new binding for DPHY Rx.
- Move the DPHY Rx part to a separate driver.
- Drop Rx specific changes from the cdns,dphy.yaml binding. Keep those
  in cdns,dphy-rx.yaml

Changes in v5:
- Use the new cdns_dphy_info to specify PHY ops.
- Re-order include in alphabetical order.
- Make bands const.
- Drop num_bands.
- Make i, lanes unsigned.
- Drop the maximum check in cdns_dphy_rx_get_band_ctrl(). Let the loop
  complete and return -EOPNOTSUPP when we reach the end.
- Drop the "rate < bands[i].min_rate" check since the bands are in
  ascending order.
- Move data_lane_ctrl to start of function and make it static const.

Changes in v4:
- Drop the submode parts. Use a different compatible for the Rx ops.
- Make bands and num_bands static.
- Drop the submode patches. Use a different compatible for Rx mode DPHY
instead.

Changes in v3:
- Use a table to select the band.
- Use a table to poll the data lane ready bits.
- Multiply the DPHY HS clock rate by 2 to get the bit rate since the
  clock is DDR.
- Add Rob's R-by.

Changes in v2:
- Drop reg description.
- Add a description for each DPHY clock.
- Rename dphy@... to phy@... in example.
- Add Laurent's R-by.
- Re-order subject prefixes.
- Add power-domain to the example.
- Add Laurent's R-by.
- Re-order subject prefixes.

Pratyush Yadav (4):
  phy: cadence: Add Cadence D-PHY Rx driver
  phy: dt-bindings: Convert Cadence DPHY binding to YAML
  phy: dt-bindings: cdns,dphy: add power-domains property
  phy: dt-bindings: Add Cadence D-PHY Rx bindings

 .../devicetree/bindings/phy/cdns,dphy-rx.yaml |  42 +++
 .../devicetree/bindings/phy/cdns,dphy.txt     |  20 --
 .../devicetree/bindings/phy/cdns,dphy.yaml    |  56 ++++
 drivers/phy/cadence/Kconfig                   |   8 +
 drivers/phy/cadence/Makefile                  |   1 +
 drivers/phy/cadence/cdns-dphy-rx.c            | 255 ++++++++++++++++++
 6 files changed, 362 insertions(+), 20 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml
 delete mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy.txt
 create mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy.yaml
 create mode 100644 drivers/phy/cadence/cdns-dphy-rx.c

-- 
2.33.1.835.ge9e5ba39a7

[PATCH v7 1/4] phy: cadence: Add Cadence D-PHY Rx driver

[Pratyush Yadav]

The Cadence D-PHY can be configured in Tx (DSI) mode or Rx (CSI) mode.
Both modes have a different programming sequence and share little among
them. In addition, a PHY configured in Tx mode cannot be used in Rx mode
and vice versa. For this reason, create a separate driver for the Rx
mode to make it easier to read and maintain.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>

---

Changes in v7:
- Add spaces after { and before } in the bands table.
- Drop the wrapping around the for loop on cdns_dphy_rx_get_band_ctrl().
- Make cdns_dphy_rx_wait_for_bit() inline.
- Print an error message if registering PHY provider fails.

Changes in v6:
- Move to a separate driver.

Changes in v5:
- Use the new cdns_dphy_info to specify PHY ops.
- Re-order include in alphabetical order.
- Make bands const.
- Drop num_bands.
- Make i, lanes unsigned.
- Drop the maximum check in cdns_dphy_rx_get_band_ctrl(). Let the loop
  complete and return -EOPNOTSUPP when we reach the end.
- Drop the "rate < bands[i].min_rate" check since the bands are in
  ascending order.
- Move data_lane_ctrl to start of function and make it static const.

Changes in v4:
- Drop the submode parts. Use a different compatible for the Rx ops.
- Make bands and num_bands static.

Changes in v3:
- Use a table to select the band.
- Use a table to poll the data lane ready bits.
- Multiply the DPHY HS clock rate by 2 to get the bit rate since the
  clock is DDR.

 drivers/phy/cadence/Kconfig        |   8 +
 drivers/phy/cadence/Makefile       |   1 +
 drivers/phy/cadence/cdns-dphy-rx.c | 255 +++++++++++++++++++++++++++++
 3 files changed, 264 insertions(+)
 create mode 100644 drivers/phy/cadence/cdns-dphy-rx.c

diff --git a/drivers/phy/cadence/Kconfig b/drivers/phy/cadence/Kconfig
index a62910ff5591..1adde2d99ae7 100644
--- a/drivers/phy/cadence/Kconfig
+++ b/drivers/phy/cadence/Kconfig
@@ -22,6 +22,14 @@ config PHY_CADENCE_DPHY
 	  system. If M is selected, the module will be called
 	  cdns-dphy.
 
+config PHY_CADENCE_DPHY_RX
+	tristate "Cadence D-PHY Rx Support"
+	depends on HAS_IOMEM && OF
+	select GENERIC_PHY
+	select GENERIC_PHY_MIPI_DPHY
+	help
+	  Support for Cadence D-PHY in Rx configuration.
+
 config PHY_CADENCE_SIERRA
 	tristate "Cadence Sierra PHY Driver"
 	depends on OF && HAS_IOMEM && RESET_CONTROLLER
diff --git a/drivers/phy/cadence/Makefile b/drivers/phy/cadence/Makefile
index 26e16bd34efe..e17f035ddece 100644
--- a/drivers/phy/cadence/Makefile
+++ b/drivers/phy/cadence/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_PHY_CADENCE_TORRENT)	+= phy-cadence-torrent.o
 obj-$(CONFIG_PHY_CADENCE_DPHY)	+= cdns-dphy.o
+obj-$(CONFIG_PHY_CADENCE_DPHY_RX)	+= cdns-dphy-rx.o
 obj-$(CONFIG_PHY_CADENCE_SIERRA)	+= phy-cadence-sierra.o
 obj-$(CONFIG_PHY_CADENCE_SALVO)	+= phy-cadence-salvo.o
diff --git a/drivers/phy/cadence/cdns-dphy-rx.c b/drivers/phy/cadence/cdns-dphy-rx.c
new file mode 100644
index 000000000000..47a5b67ded58
--- /dev/null
+++ b/drivers/phy/cadence/cdns-dphy-rx.c
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/phy/phy-mipi-dphy.h>
+#include <linux/platform_device.h>
+
+#define DPHY_PMA_CMN(reg)		(reg)
+#define DPHY_PCS(reg)			(0xb00 + (reg))
+#define DPHY_ISO(reg)			(0xc00 + (reg))
+
+#define DPHY_CMN_SSM			DPHY_PMA_CMN(0x20)
+#define DPHY_CMN_RX_MODE_EN		BIT(10)
+#define DPHY_CMN_RX_BANDGAP_TIMER_MASK	GENMASK(8, 1)
+#define DPHY_CMN_SSM_EN			BIT(0)
+
+#define DPHY_CMN_RX_BANDGAP_TIMER	0x14
+
+#define DPHY_BAND_CFG			DPHY_PCS(0x0)
+#define DPHY_BAND_CFG_RIGHT_BAND	GENMASK(9, 5)
+#define DPHY_BAND_CFG_LEFT_BAND		GENMASK(4, 0)
+
+#define DPHY_POWER_ISLAND_EN_DATA	DPHY_PCS(0x8)
+#define DPHY_POWER_ISLAND_EN_DATA_VAL	0xaaaaaaaa
+
+#define DPHY_POWER_ISLAND_EN_CLK	DPHY_PCS(0xc)
+#define DPHY_POWER_ISLAND_EN_CLK_VAL	0xaa
+
+#define DPHY_ISO_CL_CTRL_L		DPHY_ISO(0x10)
+#define DPHY_ISO_DL_CTRL_L0		DPHY_ISO(0x14)
+#define DPHY_ISO_DL_CTRL_L1		DPHY_ISO(0x20)
+#define DPHY_ISO_DL_CTRL_L2		DPHY_ISO(0x30)
+#define DPHY_ISO_DL_CTRL_L3		DPHY_ISO(0x3c)
+
+#define DPHY_ISO_LANE_READY_BIT		0
+#define DPHY_ISO_LANE_READY_TIMEOUT_MS	100UL
+
+#define DPHY_LANES_MIN			1
+#define DPHY_LANES_MAX			4
+
+struct cdns_dphy_rx {
+	void __iomem *regs;
+	struct device *dev;
+	struct phy *phy;
+};
+
+struct cdns_dphy_rx_band {
+	/* Rates are in Mbps. */
+	unsigned int min_rate;
+	unsigned int max_rate;
+};
+
+/* Order of bands is important since the index is the band number. */
+static const struct cdns_dphy_rx_band bands[] = {
+	{ 80, 100 }, { 100, 120 }, { 120, 160 }, { 160, 200 }, { 200, 240 },
+	{ 240, 280 }, { 280, 320 }, { 320, 360 }, { 360, 400 }, { 400, 480 },
+	{ 480, 560 }, { 560, 640 }, { 640, 720 }, { 720, 800 }, { 800, 880 },
+	{ 880, 1040 }, { 1040, 1200 }, { 1200, 1350 }, { 1350, 1500 },
+	{ 1500, 1750 }, { 1750, 2000 }, { 2000, 2250 }, { 2250, 2500 }
+};
+
+static int cdns_dphy_rx_power_on(struct phy *phy)
+{
+	struct cdns_dphy_rx *dphy = phy_get_drvdata(phy);
+
+	/* Start RX state machine. */
+	writel(DPHY_CMN_SSM_EN | DPHY_CMN_RX_MODE_EN |
+	       FIELD_PREP(DPHY_CMN_RX_BANDGAP_TIMER_MASK,
+			  DPHY_CMN_RX_BANDGAP_TIMER),
+	       dphy->regs + DPHY_CMN_SSM);
+
+	return 0;
+}
+
+static int cdns_dphy_rx_power_off(struct phy *phy)
+{
+	struct cdns_dphy_rx *dphy = phy_get_drvdata(phy);
+
+	writel(0, dphy->regs + DPHY_CMN_SSM);
+
+	return 0;
+}
+
+static int cdns_dphy_rx_get_band_ctrl(unsigned long hs_clk_rate)
+{
+	unsigned int rate, i;
+
+	rate = hs_clk_rate / 1000000UL;
+	/* Since CSI-2 clock is DDR, the bit rate is twice the clock rate. */
+	rate *= 2;
+
+	if (rate < bands[0].min_rate)
+		return -EOPNOTSUPP;
+
+	for (i = 0; i < ARRAY_SIZE(bands); i++)
+		if (rate < bands[i].max_rate)
+			return i;
+
+	return -EOPNOTSUPP;
+}
+
+static inline int cdns_dphy_rx_wait_for_bit(void __iomem *addr,
+					    unsigned int bit)
+{
+	u32 val;
+
+	return readl_relaxed_poll_timeout(addr, val, val & BIT(bit), 10,
+					  DPHY_ISO_LANE_READY_TIMEOUT_MS * 1000);
+}
+
+static int cdns_dphy_rx_wait_lane_ready(struct cdns_dphy_rx *dphy,
+					unsigned int lanes)
+{
+	static const u32 data_lane_ctrl[] = {DPHY_ISO_DL_CTRL_L0,
+					     DPHY_ISO_DL_CTRL_L1,
+					     DPHY_ISO_DL_CTRL_L2,
+					     DPHY_ISO_DL_CTRL_L3};
+	void __iomem *reg = dphy->regs;
+	unsigned int i;
+	int ret;
+
+	/* Data lanes. Minimum one lane is mandatory. */
+	if (lanes < DPHY_LANES_MIN || lanes > DPHY_LANES_MAX)
+		return -EINVAL;
+
+	/* Clock lane */
+	ret = cdns_dphy_rx_wait_for_bit(reg + DPHY_ISO_CL_CTRL_L,
+					DPHY_ISO_LANE_READY_BIT);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < lanes; i++) {
+		ret = cdns_dphy_rx_wait_for_bit(reg + data_lane_ctrl[i],
+						DPHY_ISO_LANE_READY_BIT);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int cdns_dphy_rx_configure(struct phy *phy,
+				  union phy_configure_opts *opts)
+{
+	struct cdns_dphy_rx *dphy = phy_get_drvdata(phy);
+	unsigned int reg;
+	int band_ctrl, ret;
+
+	band_ctrl = cdns_dphy_rx_get_band_ctrl(opts->mipi_dphy.hs_clk_rate);
+	if (band_ctrl < 0)
+		return band_ctrl;
+
+	reg = FIELD_PREP(DPHY_BAND_CFG_LEFT_BAND, band_ctrl) |
+	      FIELD_PREP(DPHY_BAND_CFG_RIGHT_BAND, band_ctrl);
+	writel(reg, dphy->regs + DPHY_BAND_CFG);
+
+	/*
+	 * Set the required power island phase 2 time. This is mandated by DPHY
+	 * specs.
+	 */
+	reg = DPHY_POWER_ISLAND_EN_DATA_VAL;
+	writel(reg, dphy->regs + DPHY_POWER_ISLAND_EN_DATA);
+	reg = DPHY_POWER_ISLAND_EN_CLK_VAL;
+	writel(reg, dphy->regs + DPHY_POWER_ISLAND_EN_CLK);
+
+	ret = cdns_dphy_rx_wait_lane_ready(dphy, opts->mipi_dphy.lanes);
+	if (ret) {
+		dev_err(dphy->dev, "DPHY wait for lane ready timeout\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cdns_dphy_rx_validate(struct phy *phy, enum phy_mode mode,
+				 int submode, union phy_configure_opts *opts)
+{
+	int ret;
+
+	if (mode != PHY_MODE_MIPI_DPHY)
+		return -EINVAL;
+
+	ret = cdns_dphy_rx_get_band_ctrl(opts->mipi_dphy.hs_clk_rate);
+	if (ret < 0)
+		return ret;
+
+	return phy_mipi_dphy_config_validate(&opts->mipi_dphy);
+}
+
+static const struct phy_ops cdns_dphy_rx_ops = {
+	.power_on = cdns_dphy_rx_power_on,
+	.power_off = cdns_dphy_rx_power_off,
+	.configure = cdns_dphy_rx_configure,
+	.validate = cdns_dphy_rx_validate,
+};
+
+static int cdns_dphy_rx_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct phy_provider *provider;
+	struct cdns_dphy_rx *dphy;
+
+	dphy = devm_kzalloc(dev, sizeof(*dphy), GFP_KERNEL);
+	if (!dphy)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, dphy);
+	dphy->dev = dev;
+
+	dphy->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(dphy->regs))
+		return PTR_ERR(dphy->regs);
+
+	dphy->phy = devm_phy_create(dev, NULL, &cdns_dphy_rx_ops);
+	if (IS_ERR(dphy->phy)) {
+		dev_err(dev, "Failed to create PHY: %d\n", PTR_ERR(dphy->phy));
+		return PTR_ERR(dphy->phy);
+	}
+
+	phy_set_drvdata(dphy->phy, dphy);
+	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+	if (IS_ERR(provider)) {
+		dev_err(dev, "Failed to register PHY provider: %d\n",
+			PTR_ERR(provider));
+		return PTR_ERR(provider);
+	}
+
+	return 0;
+}
+
+static const struct of_device_id cdns_dphy_rx_of_match[] = {
+	{ .compatible = "cdns,dphy-rx" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, cdns_dphy_rx_of_match);
+
+static struct platform_driver cdns_dphy_rx_platform_driver = {
+	.probe		= cdns_dphy_rx_probe,
+	.driver		= {
+		.name		= "cdns-mipi-dphy-rx",
+		.of_match_table	= cdns_dphy_rx_of_match,
+	},
+};
+module_platform_driver(cdns_dphy_rx_platform_driver);
+
+MODULE_AUTHOR("Pratyush Yadav <p.yadav@ti.com>");
+MODULE_DESCRIPTION("Cadence D-PHY Rx Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.33.1.835.ge9e5ba39a7

[PATCH v7 2/4] phy: dt-bindings: Convert Cadence DPHY binding to YAML

[Pratyush Yadav]

Convert Cadence DPHY binding to YAML.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>

---

(no changes since v3)

Changes in v3:
- Add Rob's R-by.

Changes in v2:
- Drop reg description.
- Add a description for each DPHY clock.
- Rename dphy@... to phy@... in example.
- Add Laurent's R-by.
- Re-order subject prefixes.

 .../devicetree/bindings/phy/cdns,dphy.txt     | 20 --------
 .../devicetree/bindings/phy/cdns,dphy.yaml    | 51 +++++++++++++++++++
 2 files changed, 51 insertions(+), 20 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy.txt
 create mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy.yaml

diff --git a/Documentation/devicetree/bindings/phy/cdns,dphy.txt b/Documentation/devicetree/bindings/phy/cdns,dphy.txt
deleted file mode 100644
index 1095bc4e72d9..000000000000
--- a/Documentation/devicetree/bindings/phy/cdns,dphy.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-Cadence DPHY
-============
-
-Cadence DPHY block.
-
-Required properties:
-- compatible: should be set to "cdns,dphy".
-- reg: physical base address and length of the DPHY registers.
-- clocks: DPHY reference clocks.
-- clock-names: must contain "psm" and "pll_ref".
-- #phy-cells: must be set to 0.
-
-Example:
-	dphy0: dphy@fd0e0000{
-		compatible = "cdns,dphy";
-		reg = <0x0 0xfd0e0000 0x0 0x1000>;
-		clocks = <&psm_clk>, <&pll_ref_clk>;
-		clock-names = "psm", "pll_ref";
-		#phy-cells = <0>;
-	};
diff --git a/Documentation/devicetree/bindings/phy/cdns,dphy.yaml b/Documentation/devicetree/bindings/phy/cdns,dphy.yaml
new file mode 100644
index 000000000000..b90a58773bf2
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/cdns,dphy.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/cdns,dphy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cadence DPHY Device Tree Bindings
+
+maintainers:
+  - Pratyush Yadav <p.yadav@ti.com>
+
+properties:
+  compatible:
+    items:
+      - const: cdns,dphy
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: PMA state machine clock
+      - description: PLL reference clock
+
+  clock-names:
+    items:
+      - const: psm
+      - const: pll_ref
+
+  "#phy-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+
+    dphy0: phy@fd0e0000{
+        compatible = "cdns,dphy";
+        reg = <0xfd0e0000 0x1000>;
+        clocks = <&psm_clk>, <&pll_ref_clk>;
+        clock-names = "psm", "pll_ref";
+        #phy-cells = <0>;
+    };
-- 
2.33.1.835.ge9e5ba39a7

[PATCH v7 3/4] phy: dt-bindings: cdns,dphy: add power-domains property

[Pratyush Yadav]

This property is needed on TI platforms to enable the PD of the DPHY
before it can be used.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rob Herring <robh@kernel.org>

---

(no changes since v3)

Changes in v3:
- Add Rob's Ack.

Changes in v2:
- Add power-domain to the example.
- Add Laurent's R-by.
- Re-order subject prefixes.

 Documentation/devicetree/bindings/phy/cdns,dphy.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/cdns,dphy.yaml b/Documentation/devicetree/bindings/phy/cdns,dphy.yaml
index b90a58773bf2..c50629bd1b51 100644
--- a/Documentation/devicetree/bindings/phy/cdns,dphy.yaml
+++ b/Documentation/devicetree/bindings/phy/cdns,dphy.yaml
@@ -30,6 +30,9 @@ properties:
   "#phy-cells":
     const: 0
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg
@@ -41,11 +44,13 @@ additionalProperties: false
 
 examples:
   - |
+    #include <dt-bindings/soc/ti,sci_pm_domain.h>
 
     dphy0: phy@fd0e0000{
         compatible = "cdns,dphy";
         reg = <0xfd0e0000 0x1000>;
         clocks = <&psm_clk>, <&pll_ref_clk>;
         clock-names = "psm", "pll_ref";
+        power-domains = <&k3_pds 147 TI_SCI_PD_EXCLUSIVE>;
         #phy-cells = <0>;
     };
-- 
2.33.1.835.ge9e5ba39a7

[PATCH v7 4/4] phy: dt-bindings: Add Cadence D-PHY Rx bindings

[Pratyush Yadav]

The Rx mode DPHY is different from Tx mode DPHY. Add a separate binding
for it.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>

---

(no changes since v6)

Changes in v6:
- Add a new binding for DPHY Rx.

 .../devicetree/bindings/phy/cdns,dphy-rx.yaml | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml

diff --git a/Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml b/Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml
new file mode 100644
index 000000000000..07be031d82e6
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/cdns,dphy-rx.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cadence DPHY Rx Device Tree Bindings
+
+maintainers:
+  - Pratyush Yadav <p.yadav@ti.com>
+
+properties:
+  compatible:
+    items:
+      - const: cdns,dphy-rx
+
+  reg:
+    maxItems: 1
+
+  "#phy-cells":
+    const: 0
+
+  power-domains:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/soc/ti,sci_pm_domain.h>
+
+    dphy0: phy@4580000 {
+        compatible = "cdns,dphy-rx";
+        reg = <0x4580000 0x1100>;
+        #phy-cells = <0>;
+        power-domains = <&k3_pds 147 TI_SCI_PD_EXCLUSIVE>;
+    };
-- 
2.33.1.835.ge9e5ba39a7

Re: [PATCH v7 4/4] phy: dt-bindings: Add Cadence D-PHY Rx bindings

[Rob Herring]

On Mon, 27 Dec 2021 16:25:45 +0530, Pratyush Yadav wrote:
> The Rx mode DPHY is different from Tx mode DPHY. Add a separate binding
> for it.
> 
> Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> 
> ---
> 
> (no changes since v6)
> 
> Changes in v6:
> - Add a new binding for DPHY Rx.
> 
>  .../devicetree/bindings/phy/cdns,dphy-rx.yaml | 42 +++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml
> 


Please add Acked-by/Reviewed-by tags when posting new versions. However,
there's no need to repost patches *only* to add the tags. The upstream
maintainer will do that for acks received on the version they apply.

If a tag was not added on purpose, please state why and what changed.

Re: [PATCH v7 4/4] phy: dt-bindings: Add Cadence D-PHY Rx bindings

[Pratyush Yadav]

Hi Rob,

On 27/12/21 12:57PM, Rob Herring wrote:
> On Mon, 27 Dec 2021 16:25:45 +0530, Pratyush Yadav wrote:
> > The Rx mode DPHY is different from Tx mode DPHY. Add a separate binding
> > for it.
> > 
> > Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> > 
> > ---
> > 
> > (no changes since v6)
> > 
> > Changes in v6:
> > - Add a new binding for DPHY Rx.
> > 
> >  .../devicetree/bindings/phy/cdns,dphy-rx.yaml | 42 +++++++++++++++++++
> >  1 file changed, 42 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml
> > 
> 
> 
> Please add Acked-by/Reviewed-by tags when posting new versions. However,
> there's no need to repost patches *only* to add the tags. The upstream
> maintainer will do that for acks received on the version they apply.
> 
> If a tag was not added on purpose, please state why and what changed.

Sorry. I missed adding your R-by. It was by mistake, since this patch 
has not changed since.

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.

Re: [PATCH v7 4/4] phy: dt-bindings: Add Cadence D-PHY Rx bindings

[Laurent Pinchart]

Hi Pratyush,

Thank you for the patch.

On Mon, Dec 27, 2021 at 04:25:45PM +0530, Pratyush Yadav wrote:
> The Rx mode DPHY is different from Tx mode DPHY. Add a separate binding
> for it.
> 
> Signed-off-by: Pratyush Yadav <p.yadav@ti.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
> 
> (no changes since v6)
> 
> Changes in v6:
> - Add a new binding for DPHY Rx.
> 
>  .../devicetree/bindings/phy/cdns,dphy-rx.yaml | 42 +++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml b/Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml
> new file mode 100644
> index 000000000000..07be031d82e6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/cdns,dphy-rx.yaml
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/cdns,dphy-rx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cadence DPHY Rx Device Tree Bindings
> +
> +maintainers:
> +  - Pratyush Yadav <p.yadav@ti.com>
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: cdns,dphy-rx
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#phy-cells":
> +    const: 0
> +
> +  power-domains:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#phy-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/soc/ti,sci_pm_domain.h>
> +
> +    dphy0: phy@4580000 {
> +        compatible = "cdns,dphy-rx";
> +        reg = <0x4580000 0x1100>;
> +        #phy-cells = <0>;
> +        power-domains = <&k3_pds 147 TI_SCI_PD_EXCLUSIVE>;
> +    };

-- 
Regards,

Laurent Pinchart

Re: [PATCH v7 1/4] phy: cadence: Add Cadence D-PHY Rx driver

[Laurent Pinchart]

Hi Pratyush,

Thank you for the patch.

On Mon, Dec 27, 2021 at 04:25:42PM +0530, Pratyush Yadav wrote:
> The Cadence D-PHY can be configured in Tx (DSI) mode or Rx (CSI) mode.
> Both modes have a different programming sequence and share little among
> them. In addition, a PHY configured in Tx mode cannot be used in Rx mode
> and vice versa. For this reason, create a separate driver for the Rx
> mode to make it easier to read and maintain.
> 
> Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> 
> ---
> 
> Changes in v7:
> - Add spaces after { and before } in the bands table.
> - Drop the wrapping around the for loop on cdns_dphy_rx_get_band_ctrl().
> - Make cdns_dphy_rx_wait_for_bit() inline.
> - Print an error message if registering PHY provider fails.
> 
> Changes in v6:
> - Move to a separate driver.
> 
> Changes in v5:
> - Use the new cdns_dphy_info to specify PHY ops.
> - Re-order include in alphabetical order.
> - Make bands const.
> - Drop num_bands.
> - Make i, lanes unsigned.
> - Drop the maximum check in cdns_dphy_rx_get_band_ctrl(). Let the loop
>   complete and return -EOPNOTSUPP when we reach the end.
> - Drop the "rate < bands[i].min_rate" check since the bands are in
>   ascending order.
> - Move data_lane_ctrl to start of function and make it static const.
> 
> Changes in v4:
> - Drop the submode parts. Use a different compatible for the Rx ops.
> - Make bands and num_bands static.
> 
> Changes in v3:
> - Use a table to select the band.
> - Use a table to poll the data lane ready bits.
> - Multiply the DPHY HS clock rate by 2 to get the bit rate since the
>   clock is DDR.
> 
>  drivers/phy/cadence/Kconfig        |   8 +
>  drivers/phy/cadence/Makefile       |   1 +
>  drivers/phy/cadence/cdns-dphy-rx.c | 255 +++++++++++++++++++++++++++++
>  3 files changed, 264 insertions(+)
>  create mode 100644 drivers/phy/cadence/cdns-dphy-rx.c
> 
> diff --git a/drivers/phy/cadence/Kconfig b/drivers/phy/cadence/Kconfig
> index a62910ff5591..1adde2d99ae7 100644
> --- a/drivers/phy/cadence/Kconfig
> +++ b/drivers/phy/cadence/Kconfig
> @@ -22,6 +22,14 @@ config PHY_CADENCE_DPHY
>  	  system. If M is selected, the module will be called
>  	  cdns-dphy.
>  
> +config PHY_CADENCE_DPHY_RX
> +	tristate "Cadence D-PHY Rx Support"
> +	depends on HAS_IOMEM && OF
> +	select GENERIC_PHY
> +	select GENERIC_PHY_MIPI_DPHY
> +	help
> +	  Support for Cadence D-PHY in Rx configuration.
> +
>  config PHY_CADENCE_SIERRA
>  	tristate "Cadence Sierra PHY Driver"
>  	depends on OF && HAS_IOMEM && RESET_CONTROLLER
> diff --git a/drivers/phy/cadence/Makefile b/drivers/phy/cadence/Makefile
> index 26e16bd34efe..e17f035ddece 100644
> --- a/drivers/phy/cadence/Makefile
> +++ b/drivers/phy/cadence/Makefile
> @@ -1,5 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  obj-$(CONFIG_PHY_CADENCE_TORRENT)	+= phy-cadence-torrent.o
>  obj-$(CONFIG_PHY_CADENCE_DPHY)	+= cdns-dphy.o
> +obj-$(CONFIG_PHY_CADENCE_DPHY_RX)	+= cdns-dphy-rx.o
>  obj-$(CONFIG_PHY_CADENCE_SIERRA)	+= phy-cadence-sierra.o
>  obj-$(CONFIG_PHY_CADENCE_SALVO)	+= phy-cadence-salvo.o
> diff --git a/drivers/phy/cadence/cdns-dphy-rx.c b/drivers/phy/cadence/cdns-dphy-rx.c
> new file mode 100644
> index 000000000000..47a5b67ded58
> --- /dev/null
> +++ b/drivers/phy/cadence/cdns-dphy-rx.c
> @@ -0,0 +1,255 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com/
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/bitops.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/phy/phy.h>
> +#include <linux/phy/phy-mipi-dphy.h>
> +#include <linux/platform_device.h>
> +
> +#define DPHY_PMA_CMN(reg)		(reg)
> +#define DPHY_PCS(reg)			(0xb00 + (reg))
> +#define DPHY_ISO(reg)			(0xc00 + (reg))
> +
> +#define DPHY_CMN_SSM			DPHY_PMA_CMN(0x20)
> +#define DPHY_CMN_RX_MODE_EN		BIT(10)
> +#define DPHY_CMN_RX_BANDGAP_TIMER_MASK	GENMASK(8, 1)
> +#define DPHY_CMN_SSM_EN			BIT(0)
> +
> +#define DPHY_CMN_RX_BANDGAP_TIMER	0x14
> +
> +#define DPHY_BAND_CFG			DPHY_PCS(0x0)
> +#define DPHY_BAND_CFG_RIGHT_BAND	GENMASK(9, 5)
> +#define DPHY_BAND_CFG_LEFT_BAND		GENMASK(4, 0)
> +
> +#define DPHY_POWER_ISLAND_EN_DATA	DPHY_PCS(0x8)
> +#define DPHY_POWER_ISLAND_EN_DATA_VAL	0xaaaaaaaa
> +
> +#define DPHY_POWER_ISLAND_EN_CLK	DPHY_PCS(0xc)
> +#define DPHY_POWER_ISLAND_EN_CLK_VAL	0xaa
> +
> +#define DPHY_ISO_CL_CTRL_L		DPHY_ISO(0x10)
> +#define DPHY_ISO_DL_CTRL_L0		DPHY_ISO(0x14)
> +#define DPHY_ISO_DL_CTRL_L1		DPHY_ISO(0x20)
> +#define DPHY_ISO_DL_CTRL_L2		DPHY_ISO(0x30)
> +#define DPHY_ISO_DL_CTRL_L3		DPHY_ISO(0x3c)
> +
> +#define DPHY_ISO_LANE_READY_BIT		0
> +#define DPHY_ISO_LANE_READY_TIMEOUT_MS	100UL
> +
> +#define DPHY_LANES_MIN			1
> +#define DPHY_LANES_MAX			4
> +
> +struct cdns_dphy_rx {
> +	void __iomem *regs;
> +	struct device *dev;
> +	struct phy *phy;
> +};
> +
> +struct cdns_dphy_rx_band {
> +	/* Rates are in Mbps. */
> +	unsigned int min_rate;
> +	unsigned int max_rate;
> +};
> +
> +/* Order of bands is important since the index is the band number. */
> +static const struct cdns_dphy_rx_band bands[] = {
> +	{ 80, 100 }, { 100, 120 }, { 120, 160 }, { 160, 200 }, { 200, 240 },
> +	{ 240, 280 }, { 280, 320 }, { 320, 360 }, { 360, 400 }, { 400, 480 },
> +	{ 480, 560 }, { 560, 640 }, { 640, 720 }, { 720, 800 }, { 800, 880 },
> +	{ 880, 1040 }, { 1040, 1200 }, { 1200, 1350 }, { 1350, 1500 },
> +	{ 1500, 1750 }, { 1750, 2000 }, { 2000, 2250 }, { 2250, 2500 }

It could be possible to store only the min or max rate, as
bands[i].max_rate == bands[i+1].min_rate. Up to you.

> +};
> +
> +static int cdns_dphy_rx_power_on(struct phy *phy)
> +{
> +	struct cdns_dphy_rx *dphy = phy_get_drvdata(phy);
> +
> +	/* Start RX state machine. */
> +	writel(DPHY_CMN_SSM_EN | DPHY_CMN_RX_MODE_EN |
> +	       FIELD_PREP(DPHY_CMN_RX_BANDGAP_TIMER_MASK,
> +			  DPHY_CMN_RX_BANDGAP_TIMER),
> +	       dphy->regs + DPHY_CMN_SSM);
> +
> +	return 0;
> +}
> +
> +static int cdns_dphy_rx_power_off(struct phy *phy)
> +{
> +	struct cdns_dphy_rx *dphy = phy_get_drvdata(phy);
> +
> +	writel(0, dphy->regs + DPHY_CMN_SSM);
> +
> +	return 0;
> +}
> +
> +static int cdns_dphy_rx_get_band_ctrl(unsigned long hs_clk_rate)
> +{
> +	unsigned int rate, i;
> +
> +	rate = hs_clk_rate / 1000000UL;
> +	/* Since CSI-2 clock is DDR, the bit rate is twice the clock rate. */
> +	rate *= 2;
> +
> +	if (rate < bands[0].min_rate)
> +		return -EOPNOTSUPP;
> +
> +	for (i = 0; i < ARRAY_SIZE(bands); i++)
> +		if (rate < bands[i].max_rate)
> +			return i;
> +
> +	return -EOPNOTSUPP;
> +}
> +
> +static inline int cdns_dphy_rx_wait_for_bit(void __iomem *addr,
> +					    unsigned int bit)
> +{
> +	u32 val;
> +
> +	return readl_relaxed_poll_timeout(addr, val, val & BIT(bit), 10,
> +					  DPHY_ISO_LANE_READY_TIMEOUT_MS * 1000);
> +}
> +
> +static int cdns_dphy_rx_wait_lane_ready(struct cdns_dphy_rx *dphy,
> +					unsigned int lanes)
> +{
> +	static const u32 data_lane_ctrl[] = {DPHY_ISO_DL_CTRL_L0,
> +					     DPHY_ISO_DL_CTRL_L1,
> +					     DPHY_ISO_DL_CTRL_L2,
> +					     DPHY_ISO_DL_CTRL_L3};
> +	void __iomem *reg = dphy->regs;
> +	unsigned int i;
> +	int ret;
> +
> +	/* Data lanes. Minimum one lane is mandatory. */
> +	if (lanes < DPHY_LANES_MIN || lanes > DPHY_LANES_MAX)
> +		return -EINVAL;

How about moving this at the beginning of cdns_dphy_rx_configure(), to
avoid starting the configuration sequence if the parameter is wrong ?

> +
> +	/* Clock lane */
> +	ret = cdns_dphy_rx_wait_for_bit(reg + DPHY_ISO_CL_CTRL_L,
> +					DPHY_ISO_LANE_READY_BIT);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < lanes; i++) {
> +		ret = cdns_dphy_rx_wait_for_bit(reg + data_lane_ctrl[i],
> +						DPHY_ISO_LANE_READY_BIT);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int cdns_dphy_rx_configure(struct phy *phy,
> +				  union phy_configure_opts *opts)
> +{
> +	struct cdns_dphy_rx *dphy = phy_get_drvdata(phy);
> +	unsigned int reg;
> +	int band_ctrl, ret;
> +
> +	band_ctrl = cdns_dphy_rx_get_band_ctrl(opts->mipi_dphy.hs_clk_rate);
> +	if (band_ctrl < 0)
> +		return band_ctrl;
> +
> +	reg = FIELD_PREP(DPHY_BAND_CFG_LEFT_BAND, band_ctrl) |
> +	      FIELD_PREP(DPHY_BAND_CFG_RIGHT_BAND, band_ctrl);
> +	writel(reg, dphy->regs + DPHY_BAND_CFG);
> +
> +	/*
> +	 * Set the required power island phase 2 time. This is mandated by DPHY
> +	 * specs.
> +	 */
> +	reg = DPHY_POWER_ISLAND_EN_DATA_VAL;
> +	writel(reg, dphy->regs + DPHY_POWER_ISLAND_EN_DATA);
> +	reg = DPHY_POWER_ISLAND_EN_CLK_VAL;
> +	writel(reg, dphy->regs + DPHY_POWER_ISLAND_EN_CLK);
> +
> +	ret = cdns_dphy_rx_wait_lane_ready(dphy, opts->mipi_dphy.lanes);
> +	if (ret) {
> +		dev_err(dphy->dev, "DPHY wait for lane ready timeout\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int cdns_dphy_rx_validate(struct phy *phy, enum phy_mode mode,
> +				 int submode, union phy_configure_opts *opts)
> +{
> +	int ret;
> +
> +	if (mode != PHY_MODE_MIPI_DPHY)
> +		return -EINVAL;
> +
> +	ret = cdns_dphy_rx_get_band_ctrl(opts->mipi_dphy.hs_clk_rate);
> +	if (ret < 0)
> +		return ret;
> +
> +	return phy_mipi_dphy_config_validate(&opts->mipi_dphy);
> +}
> +
> +static const struct phy_ops cdns_dphy_rx_ops = {
> +	.power_on = cdns_dphy_rx_power_on,
> +	.power_off = cdns_dphy_rx_power_off,
> +	.configure = cdns_dphy_rx_configure,
> +	.validate = cdns_dphy_rx_validate,
> +};
> +
> +static int cdns_dphy_rx_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct phy_provider *provider;
> +	struct cdns_dphy_rx *dphy;
> +
> +	dphy = devm_kzalloc(dev, sizeof(*dphy), GFP_KERNEL);
> +	if (!dphy)
> +		return -ENOMEM;
> +
> +	dev_set_drvdata(dev, dphy);
> +	dphy->dev = dev;
> +
> +	dphy->regs = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(dphy->regs))
> +		return PTR_ERR(dphy->regs);
> +
> +	dphy->phy = devm_phy_create(dev, NULL, &cdns_dphy_rx_ops);
> +	if (IS_ERR(dphy->phy)) {
> +		dev_err(dev, "Failed to create PHY: %d\n", PTR_ERR(dphy->phy));
> +		return PTR_ERR(dphy->phy);
> +	}
> +
> +	phy_set_drvdata(dphy->phy, dphy);
> +	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +	if (IS_ERR(provider)) {
> +		dev_err(dev, "Failed to register PHY provider: %d\n",
> +			PTR_ERR(provider));
> +		return PTR_ERR(provider);
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id cdns_dphy_rx_of_match[] = {
> +	{ .compatible = "cdns,dphy-rx" },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, cdns_dphy_rx_of_match);
> +
> +static struct platform_driver cdns_dphy_rx_platform_driver = {
> +	.probe		= cdns_dphy_rx_probe,
> +	.driver		= {
> +		.name		= "cdns-mipi-dphy-rx",
> +		.of_match_table	= cdns_dphy_rx_of_match,
> +	},
> +};
> +module_platform_driver(cdns_dphy_rx_platform_driver);
> +
> +MODULE_AUTHOR("Pratyush Yadav <p.yadav@ti.com>");
> +MODULE_DESCRIPTION("Cadence D-PHY Rx Driver");
> +MODULE_LICENSE("GPL v2");

This should be "GPL". "GPL v2" exists for historical reasons (see
Documentation/process/license-rules.rst).

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

-- 
Regards,

Laurent Pinchart

Re: [PATCH v7 1/4] phy: cadence: Add Cadence D-PHY Rx driver

[Pratyush Yadav]

On 30/12/21 01:30AM, Laurent Pinchart wrote:
> Hi Pratyush,
> 
> Thank you for the patch.
> 
> On Mon, Dec 27, 2021 at 04:25:42PM +0530, Pratyush Yadav wrote:
> > The Cadence D-PHY can be configured in Tx (DSI) mode or Rx (CSI) mode.
> > Both modes have a different programming sequence and share little among
> > them. In addition, a PHY configured in Tx mode cannot be used in Rx mode
> > and vice versa. For this reason, create a separate driver for the Rx
> > mode to make it easier to read and maintain.
> > 
> > Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> > 
> > ---
> > 
> > Changes in v7:
> > - Add spaces after { and before } in the bands table.
> > - Drop the wrapping around the for loop on cdns_dphy_rx_get_band_ctrl().
> > - Make cdns_dphy_rx_wait_for_bit() inline.
> > - Print an error message if registering PHY provider fails.
> > 
> > Changes in v6:
> > - Move to a separate driver.
> > 
> > Changes in v5:
> > - Use the new cdns_dphy_info to specify PHY ops.
> > - Re-order include in alphabetical order.
> > - Make bands const.
> > - Drop num_bands.
> > - Make i, lanes unsigned.
> > - Drop the maximum check in cdns_dphy_rx_get_band_ctrl(). Let the loop
> >   complete and return -EOPNOTSUPP when we reach the end.
> > - Drop the "rate < bands[i].min_rate" check since the bands are in
> >   ascending order.
> > - Move data_lane_ctrl to start of function and make it static const.
> > 
> > Changes in v4:
> > - Drop the submode parts. Use a different compatible for the Rx ops.
> > - Make bands and num_bands static.
> > 
> > Changes in v3:
> > - Use a table to select the band.
> > - Use a table to poll the data lane ready bits.
> > - Multiply the DPHY HS clock rate by 2 to get the bit rate since the
> >   clock is DDR.
> > 
> >  drivers/phy/cadence/Kconfig        |   8 +
> >  drivers/phy/cadence/Makefile       |   1 +
> >  drivers/phy/cadence/cdns-dphy-rx.c | 255 +++++++++++++++++++++++++++++
> >  3 files changed, 264 insertions(+)
> >  create mode 100644 drivers/phy/cadence/cdns-dphy-rx.c
> > 
> > diff --git a/drivers/phy/cadence/Kconfig b/drivers/phy/cadence/Kconfig
> > index a62910ff5591..1adde2d99ae7 100644
> > --- a/drivers/phy/cadence/Kconfig
> > +++ b/drivers/phy/cadence/Kconfig
> > @@ -22,6 +22,14 @@ config PHY_CADENCE_DPHY
> >  	  system. If M is selected, the module will be called
> >  	  cdns-dphy.
> >  
> > +config PHY_CADENCE_DPHY_RX
> > +	tristate "Cadence D-PHY Rx Support"
> > +	depends on HAS_IOMEM && OF
> > +	select GENERIC_PHY
> > +	select GENERIC_PHY_MIPI_DPHY
> > +	help
> > +	  Support for Cadence D-PHY in Rx configuration.
> > +
> >  config PHY_CADENCE_SIERRA
> >  	tristate "Cadence Sierra PHY Driver"
> >  	depends on OF && HAS_IOMEM && RESET_CONTROLLER
> > diff --git a/drivers/phy/cadence/Makefile b/drivers/phy/cadence/Makefile
> > index 26e16bd34efe..e17f035ddece 100644
> > --- a/drivers/phy/cadence/Makefile
> > +++ b/drivers/phy/cadence/Makefile
> > @@ -1,5 +1,6 @@
> >  # SPDX-License-Identifier: GPL-2.0-only
> >  obj-$(CONFIG_PHY_CADENCE_TORRENT)	+= phy-cadence-torrent.o
> >  obj-$(CONFIG_PHY_CADENCE_DPHY)	+= cdns-dphy.o
> > +obj-$(CONFIG_PHY_CADENCE_DPHY_RX)	+= cdns-dphy-rx.o
> >  obj-$(CONFIG_PHY_CADENCE_SIERRA)	+= phy-cadence-sierra.o
> >  obj-$(CONFIG_PHY_CADENCE_SALVO)	+= phy-cadence-salvo.o
> > diff --git a/drivers/phy/cadence/cdns-dphy-rx.c b/drivers/phy/cadence/cdns-dphy-rx.c
> > new file mode 100644
> > index 000000000000..47a5b67ded58
> > --- /dev/null
> > +++ b/drivers/phy/cadence/cdns-dphy-rx.c
> > @@ -0,0 +1,255 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com/
> > + */
> > +
> > +#include <linux/bitfield.h>
> > +#include <linux/bitops.h>
> > +#include <linux/io.h>
> > +#include <linux/iopoll.h>
> > +#include <linux/module.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/phy/phy-mipi-dphy.h>
> > +#include <linux/platform_device.h>
> > +
> > +#define DPHY_PMA_CMN(reg)		(reg)
> > +#define DPHY_PCS(reg)			(0xb00 + (reg))
> > +#define DPHY_ISO(reg)			(0xc00 + (reg))
> > +
> > +#define DPHY_CMN_SSM			DPHY_PMA_CMN(0x20)
> > +#define DPHY_CMN_RX_MODE_EN		BIT(10)
> > +#define DPHY_CMN_RX_BANDGAP_TIMER_MASK	GENMASK(8, 1)
> > +#define DPHY_CMN_SSM_EN			BIT(0)
> > +
> > +#define DPHY_CMN_RX_BANDGAP_TIMER	0x14
> > +
> > +#define DPHY_BAND_CFG			DPHY_PCS(0x0)
> > +#define DPHY_BAND_CFG_RIGHT_BAND	GENMASK(9, 5)
> > +#define DPHY_BAND_CFG_LEFT_BAND		GENMASK(4, 0)
> > +
> > +#define DPHY_POWER_ISLAND_EN_DATA	DPHY_PCS(0x8)
> > +#define DPHY_POWER_ISLAND_EN_DATA_VAL	0xaaaaaaaa
> > +
> > +#define DPHY_POWER_ISLAND_EN_CLK	DPHY_PCS(0xc)
> > +#define DPHY_POWER_ISLAND_EN_CLK_VAL	0xaa
> > +
> > +#define DPHY_ISO_CL_CTRL_L		DPHY_ISO(0x10)
> > +#define DPHY_ISO_DL_CTRL_L0		DPHY_ISO(0x14)
> > +#define DPHY_ISO_DL_CTRL_L1		DPHY_ISO(0x20)
> > +#define DPHY_ISO_DL_CTRL_L2		DPHY_ISO(0x30)
> > +#define DPHY_ISO_DL_CTRL_L3		DPHY_ISO(0x3c)
> > +
> > +#define DPHY_ISO_LANE_READY_BIT		0
> > +#define DPHY_ISO_LANE_READY_TIMEOUT_MS	100UL
> > +
> > +#define DPHY_LANES_MIN			1
> > +#define DPHY_LANES_MAX			4
> > +
> > +struct cdns_dphy_rx {
> > +	void __iomem *regs;
> > +	struct device *dev;
> > +	struct phy *phy;
> > +};
> > +
> > +struct cdns_dphy_rx_band {
> > +	/* Rates are in Mbps. */
> > +	unsigned int min_rate;
> > +	unsigned int max_rate;
> > +};
> > +
> > +/* Order of bands is important since the index is the band number. */
> > +static const struct cdns_dphy_rx_band bands[] = {
> > +	{ 80, 100 }, { 100, 120 }, { 120, 160 }, { 160, 200 }, { 200, 240 },
> > +	{ 240, 280 }, { 280, 320 }, { 320, 360 }, { 360, 400 }, { 400, 480 },
> > +	{ 480, 560 }, { 560, 640 }, { 640, 720 }, { 720, 800 }, { 800, 880 },
> > +	{ 880, 1040 }, { 1040, 1200 }, { 1200, 1350 }, { 1350, 1500 },
> > +	{ 1500, 1750 }, { 1750, 2000 }, { 2000, 2250 }, { 2250, 2500 }
> 
> It could be possible to store only the min or max rate, as
> bands[i].max_rate == bands[i+1].min_rate. Up to you.

I don't have a strong preference. I think this looks a bit nicer and is 
easier to understand at first glance.

> 
> > +};
> > +
> > +static int cdns_dphy_rx_power_on(struct phy *phy)
> > +{
> > +	struct cdns_dphy_rx *dphy = phy_get_drvdata(phy);
> > +
> > +	/* Start RX state machine. */
> > +	writel(DPHY_CMN_SSM_EN | DPHY_CMN_RX_MODE_EN |
> > +	       FIELD_PREP(DPHY_CMN_RX_BANDGAP_TIMER_MASK,
> > +			  DPHY_CMN_RX_BANDGAP_TIMER),
> > +	       dphy->regs + DPHY_CMN_SSM);
> > +
> > +	return 0;
> > +}
> > +
> > +static int cdns_dphy_rx_power_off(struct phy *phy)
> > +{
> > +	struct cdns_dphy_rx *dphy = phy_get_drvdata(phy);
> > +
> > +	writel(0, dphy->regs + DPHY_CMN_SSM);
> > +
> > +	return 0;
> > +}
> > +
> > +static int cdns_dphy_rx_get_band_ctrl(unsigned long hs_clk_rate)
> > +{
> > +	unsigned int rate, i;
> > +
> > +	rate = hs_clk_rate / 1000000UL;
> > +	/* Since CSI-2 clock is DDR, the bit rate is twice the clock rate. */
> > +	rate *= 2;
> > +
> > +	if (rate < bands[0].min_rate)
> > +		return -EOPNOTSUPP;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(bands); i++)
> > +		if (rate < bands[i].max_rate)
> > +			return i;
> > +
> > +	return -EOPNOTSUPP;
> > +}
> > +
> > +static inline int cdns_dphy_rx_wait_for_bit(void __iomem *addr,
> > +					    unsigned int bit)
> > +{
> > +	u32 val;
> > +
> > +	return readl_relaxed_poll_timeout(addr, val, val & BIT(bit), 10,
> > +					  DPHY_ISO_LANE_READY_TIMEOUT_MS * 1000);
> > +}
> > +
> > +static int cdns_dphy_rx_wait_lane_ready(struct cdns_dphy_rx *dphy,
> > +					unsigned int lanes)
> > +{
> > +	static const u32 data_lane_ctrl[] = {DPHY_ISO_DL_CTRL_L0,
> > +					     DPHY_ISO_DL_CTRL_L1,
> > +					     DPHY_ISO_DL_CTRL_L2,
> > +					     DPHY_ISO_DL_CTRL_L3};
> > +	void __iomem *reg = dphy->regs;
> > +	unsigned int i;
> > +	int ret;
> > +
> > +	/* Data lanes. Minimum one lane is mandatory. */
> > +	if (lanes < DPHY_LANES_MIN || lanes > DPHY_LANES_MAX)
> > +		return -EINVAL;
> 
> How about moving this at the beginning of cdns_dphy_rx_configure(), to
> avoid starting the configuration sequence if the parameter is wrong ?

Ok.

> 
> > +
> > +	/* Clock lane */
> > +	ret = cdns_dphy_rx_wait_for_bit(reg + DPHY_ISO_CL_CTRL_L,
> > +					DPHY_ISO_LANE_READY_BIT);
> > +	if (ret)
> > +		return ret;
> > +
> > +	for (i = 0; i < lanes; i++) {
> > +		ret = cdns_dphy_rx_wait_for_bit(reg + data_lane_ctrl[i],
> > +						DPHY_ISO_LANE_READY_BIT);
> > +		if (ret)
> > +			return ret;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int cdns_dphy_rx_configure(struct phy *phy,
> > +				  union phy_configure_opts *opts)
> > +{
> > +	struct cdns_dphy_rx *dphy = phy_get_drvdata(phy);
> > +	unsigned int reg;
> > +	int band_ctrl, ret;
> > +
> > +	band_ctrl = cdns_dphy_rx_get_band_ctrl(opts->mipi_dphy.hs_clk_rate);
> > +	if (band_ctrl < 0)
> > +		return band_ctrl;
> > +
> > +	reg = FIELD_PREP(DPHY_BAND_CFG_LEFT_BAND, band_ctrl) |
> > +	      FIELD_PREP(DPHY_BAND_CFG_RIGHT_BAND, band_ctrl);
> > +	writel(reg, dphy->regs + DPHY_BAND_CFG);
> > +
> > +	/*
> > +	 * Set the required power island phase 2 time. This is mandated by DPHY
> > +	 * specs.
> > +	 */
> > +	reg = DPHY_POWER_ISLAND_EN_DATA_VAL;
> > +	writel(reg, dphy->regs + DPHY_POWER_ISLAND_EN_DATA);
> > +	reg = DPHY_POWER_ISLAND_EN_CLK_VAL;
> > +	writel(reg, dphy->regs + DPHY_POWER_ISLAND_EN_CLK);
> > +
> > +	ret = cdns_dphy_rx_wait_lane_ready(dphy, opts->mipi_dphy.lanes);
> > +	if (ret) {
> > +		dev_err(dphy->dev, "DPHY wait for lane ready timeout\n");
> > +		return ret;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int cdns_dphy_rx_validate(struct phy *phy, enum phy_mode mode,
> > +				 int submode, union phy_configure_opts *opts)
> > +{
> > +	int ret;
> > +
> > +	if (mode != PHY_MODE_MIPI_DPHY)
> > +		return -EINVAL;
> > +
> > +	ret = cdns_dphy_rx_get_band_ctrl(opts->mipi_dphy.hs_clk_rate);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return phy_mipi_dphy_config_validate(&opts->mipi_dphy);
> > +}
> > +
> > +static const struct phy_ops cdns_dphy_rx_ops = {
> > +	.power_on = cdns_dphy_rx_power_on,
> > +	.power_off = cdns_dphy_rx_power_off,
> > +	.configure = cdns_dphy_rx_configure,
> > +	.validate = cdns_dphy_rx_validate,
> > +};
> > +
> > +static int cdns_dphy_rx_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct phy_provider *provider;
> > +	struct cdns_dphy_rx *dphy;
> > +
> > +	dphy = devm_kzalloc(dev, sizeof(*dphy), GFP_KERNEL);
> > +	if (!dphy)
> > +		return -ENOMEM;
> > +
> > +	dev_set_drvdata(dev, dphy);
> > +	dphy->dev = dev;
> > +
> > +	dphy->regs = devm_platform_ioremap_resource(pdev, 0);
> > +	if (IS_ERR(dphy->regs))
> > +		return PTR_ERR(dphy->regs);
> > +
> > +	dphy->phy = devm_phy_create(dev, NULL, &cdns_dphy_rx_ops);
> > +	if (IS_ERR(dphy->phy)) {
> > +		dev_err(dev, "Failed to create PHY: %d\n", PTR_ERR(dphy->phy));
> > +		return PTR_ERR(dphy->phy);
> > +	}
> > +
> > +	phy_set_drvdata(dphy->phy, dphy);
> > +	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> > +	if (IS_ERR(provider)) {
> > +		dev_err(dev, "Failed to register PHY provider: %d\n",
> > +			PTR_ERR(provider));
> > +		return PTR_ERR(provider);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id cdns_dphy_rx_of_match[] = {
> > +	{ .compatible = "cdns,dphy-rx" },
> > +	{ /* sentinel */ },
> > +};
> > +MODULE_DEVICE_TABLE(of, cdns_dphy_rx_of_match);
> > +
> > +static struct platform_driver cdns_dphy_rx_platform_driver = {
> > +	.probe		= cdns_dphy_rx_probe,
> > +	.driver		= {
> > +		.name		= "cdns-mipi-dphy-rx",
> > +		.of_match_table	= cdns_dphy_rx_of_match,
> > +	},
> > +};
> > +module_platform_driver(cdns_dphy_rx_platform_driver);
> > +
> > +MODULE_AUTHOR("Pratyush Yadav <p.yadav@ti.com>");
> > +MODULE_DESCRIPTION("Cadence D-PHY Rx Driver");
> > +MODULE_LICENSE("GPL v2");
> 
> This should be "GPL". "GPL v2" exists for historical reasons (see
> Documentation/process/license-rules.rst).

Ok.

> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Thanks.

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.

Re: [PATCH v7 1/4] phy: cadence: Add Cadence D-PHY Rx driver

[kernel test robot]

Hi Pratyush,

I love your patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master v5.16-rc8 next-20211224]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Pratyush-Yadav/Rx-mode-support-for-Cadence-DPHY/20211227-185749
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: csky-allyesconfig (https://download.01.org/0day-ci/archive/20220104/202201041908.dB4f5BTe-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/266027120669b8824f07fa9c2f7a59b7bc12648c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Pratyush-Yadav/Rx-mode-support-for-Cadence-DPHY/20211227-185749
        git checkout 266027120669b8824f07fa9c2f7a59b7bc12648c
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=csky SHELL=/bin/bash drivers/phy/cadence/ drivers/thermal/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/device.h:15,
                    from include/linux/phy/phy.h:15,
                    from drivers/phy/cadence/cdns-dphy-rx.c:11:
   drivers/phy/cadence/cdns-dphy-rx.c: In function 'cdns_dphy_rx_probe':
>> drivers/phy/cadence/cdns-dphy-rx.c:223:30: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long int' [-Wformat=]
     223 |                 dev_err(dev, "Failed to create PHY: %d\n", PTR_ERR(dphy->phy));
         |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/dev_printk.h:110:30: note: in definition of macro 'dev_printk_index_wrap'
     110 |                 _p_func(dev, fmt, ##__VA_ARGS__);                       \
         |                              ^~~
   include/linux/dev_printk.h:144:56: note: in expansion of macro 'dev_fmt'
     144 |         dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
         |                                                        ^~~~~~~
   drivers/phy/cadence/cdns-dphy-rx.c:223:17: note: in expansion of macro 'dev_err'
     223 |                 dev_err(dev, "Failed to create PHY: %d\n", PTR_ERR(dphy->phy));
         |                 ^~~~~~~
   drivers/phy/cadence/cdns-dphy-rx.c:223:54: note: format string is defined here
     223 |                 dev_err(dev, "Failed to create PHY: %d\n", PTR_ERR(dphy->phy));
         |                                                     ~^
         |                                                      |
         |                                                      int
         |                                                     %ld
   In file included from include/linux/device.h:15,
                    from include/linux/phy/phy.h:15,
                    from drivers/phy/cadence/cdns-dphy-rx.c:11:
   drivers/phy/cadence/cdns-dphy-rx.c:230:30: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long int' [-Wformat=]
     230 |                 dev_err(dev, "Failed to register PHY provider: %d\n",
         |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/dev_printk.h:110:30: note: in definition of macro 'dev_printk_index_wrap'
     110 |                 _p_func(dev, fmt, ##__VA_ARGS__);                       \
         |                              ^~~
   include/linux/dev_printk.h:144:56: note: in expansion of macro 'dev_fmt'
     144 |         dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
         |                                                        ^~~~~~~
   drivers/phy/cadence/cdns-dphy-rx.c:230:17: note: in expansion of macro 'dev_err'
     230 |                 dev_err(dev, "Failed to register PHY provider: %d\n",
         |                 ^~~~~~~
   drivers/phy/cadence/cdns-dphy-rx.c:230:65: note: format string is defined here
     230 |                 dev_err(dev, "Failed to register PHY provider: %d\n",
         |                                                                ~^
         |                                                                 |
         |                                                                 int
         |                                                                %ld


vim +223 drivers/phy/cadence/cdns-dphy-rx.c

   203	
   204	static int cdns_dphy_rx_probe(struct platform_device *pdev)
   205	{
   206		struct device *dev = &pdev->dev;
   207		struct phy_provider *provider;
   208		struct cdns_dphy_rx *dphy;
   209	
   210		dphy = devm_kzalloc(dev, sizeof(*dphy), GFP_KERNEL);
   211		if (!dphy)
   212			return -ENOMEM;
   213	
   214		dev_set_drvdata(dev, dphy);
   215		dphy->dev = dev;
   216	
   217		dphy->regs = devm_platform_ioremap_resource(pdev, 0);
   218		if (IS_ERR(dphy->regs))
   219			return PTR_ERR(dphy->regs);
   220	
   221		dphy->phy = devm_phy_create(dev, NULL, &cdns_dphy_rx_ops);
   222		if (IS_ERR(dphy->phy)) {
 > 223			dev_err(dev, "Failed to create PHY: %d\n", PTR_ERR(dphy->phy));
   224			return PTR_ERR(dphy->phy);
   225		}
   226	
   227		phy_set_drvdata(dphy->phy, dphy);
   228		provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
   229		if (IS_ERR(provider)) {
   230			dev_err(dev, "Failed to register PHY provider: %d\n",
   231				PTR_ERR(provider));
   232			return PTR_ERR(provider);
   233		}
   234	
   235		return 0;
   236	}
   237	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Re: [PATCH v7 1/4] phy: cadence: Add Cadence D-PHY Rx driver

[kernel test robot]

Hi Pratyush,

I love your patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master v5.16-rc8 next-20220104]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Pratyush-Yadav/Rx-mode-support-for-Cadence-DPHY/20211227-185749
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: riscv-randconfig-r013-20220105 (https://download.01.org/0day-ci/archive/20220105/202201051328.31W7Semj-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d5b6e30ed3acad794dd0aec400e617daffc6cc3d)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/0day-ci/linux/commit/266027120669b8824f07fa9c2f7a59b7bc12648c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Pratyush-Yadav/Rx-mode-support-for-Cadence-DPHY/20211227-185749
        git checkout 266027120669b8824f07fa9c2f7a59b7bc12648c
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/phy/cadence/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/phy/cadence/cdns-dphy-rx.c:223:46: warning: format specifies type 'int' but the argument has type 'long' [-Wformat]
                   dev_err(dev, "Failed to create PHY: %d\n", PTR_ERR(dphy->phy));
                                                       ~~     ^~~~~~~~~~~~~~~~~~
                                                       %ld
   include/linux/dev_printk.h:144:65: note: expanded from macro 'dev_err'
           dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
                                                                  ~~~     ^~~~~~~~~~~
   include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap'
                   _p_func(dev, fmt, ##__VA_ARGS__);                       \
                                ~~~    ^~~~~~~~~~~
   drivers/phy/cadence/cdns-dphy-rx.c:231:4: warning: format specifies type 'int' but the argument has type 'long' [-Wformat]
                           PTR_ERR(provider));
                           ^~~~~~~~~~~~~~~~~
   include/linux/dev_printk.h:144:65: note: expanded from macro 'dev_err'
           dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
                                                                  ~~~     ^~~~~~~~~~~
   include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap'
                   _p_func(dev, fmt, ##__VA_ARGS__);                       \
                                ~~~    ^~~~~~~~~~~
   2 warnings generated.


vim +223 drivers/phy/cadence/cdns-dphy-rx.c

   203	
   204	static int cdns_dphy_rx_probe(struct platform_device *pdev)
   205	{
   206		struct device *dev = &pdev->dev;
   207		struct phy_provider *provider;
   208		struct cdns_dphy_rx *dphy;
   209	
   210		dphy = devm_kzalloc(dev, sizeof(*dphy), GFP_KERNEL);
   211		if (!dphy)
   212			return -ENOMEM;
   213	
   214		dev_set_drvdata(dev, dphy);
   215		dphy->dev = dev;
   216	
   217		dphy->regs = devm_platform_ioremap_resource(pdev, 0);
   218		if (IS_ERR(dphy->regs))
   219			return PTR_ERR(dphy->regs);
   220	
   221		dphy->phy = devm_phy_create(dev, NULL, &cdns_dphy_rx_ops);
   222		if (IS_ERR(dphy->phy)) {
 > 223			dev_err(dev, "Failed to create PHY: %d\n", PTR_ERR(dphy->phy));
   224			return PTR_ERR(dphy->phy);
   225		}
   226	
   227		phy_set_drvdata(dphy->phy, dphy);
   228		provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
   229		if (IS_ERR(provider)) {
   230			dev_err(dev, "Failed to register PHY provider: %d\n",
   231				PTR_ERR(provider));
   232			return PTR_ERR(provider);
   233		}
   234	
   235		return 0;
   236	}
   237	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org