[PATCH] [media] rcar-csi2: add Renesas R-Car MIPI CSI-2 driver

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A V4L2 driver for Renesas R-Car MIPI CSI-2 interface. The driver
supports the rcar-vin driver on R-Car Gen3 SoCs where a separate driver
is needed to receive CSI-2.

Driver is based on a prototype by Koji Matsuoka in the Renesas BSP.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
 .../devicetree/bindings/media/rcar-csi2.txt        |  79 +++
 drivers/media/platform/rcar-vin/Kconfig            |  11 +
 drivers/media/platform/rcar-vin/Makefile           |   2 +
 drivers/media/platform/rcar-vin/rcar-csi2.c        | 545 +++++++++++++++++++++
 4 files changed, 637 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/rcar-csi2.txt
 create mode 100644 drivers/media/platform/rcar-vin/rcar-csi2.c

diff --git a/Documentation/devicetree/bindings/media/rcar-csi2.txt b/Documentation/devicetree/bindings/media/rcar-csi2.txt
new file mode 100644
index 0000000..58a89e0
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/rcar-csi2.txt
@@ -0,0 +1,79 @@
+Renesas R-Car MIPI CSI-2 driver (rcar-csi2)
+-------------------------------------------
+
+The rcar-csi2 device provides MIPI CSI-2 capabilities for the Renesas R-Car
+family of devices. It is to be used in conjunction with the rcar-vin driver which
+provides the video input capabilities.
+
+ - compatible: Must be one or more of the following
+   - "renesas,csi2-r8a7795" for the R8A7795 device
+   - "renesas,rcar-gen3-csi2" for a generic R-Car Gen3 compatible device.
+
+   When compatible with the generic version nodes must list the
+   SoC-specific version corresponding to the platform first
+   followed by the generic version.
+
+ - reg: the register base and size for the device registers
+ - interrupts: the interrupt for the device
+ - clocks: Reference to the parent clock
+
+The device node should contain two 'port' child nodes with one child 'endpoint'
+node, according to the bindings defined in Documentation/devicetree/bindings/
+media/video-interfaces.txt. Port 0 should connect the device that is the CSI-2
+producer. Port 1 should connect the R-Car VIN device (rcar-vin) consumer.
+
+ - ports:
+   - port@0: sub-node describing a endpoint to the CSI-2 source
+   - port@1: sub-node describing a endpoint to the VIN consumer
+
+Additionally, an alias named csiX will need to be created to specify
+which CSI-2 device this is.
+
+Example:
+
+/* SoC properties */
+
+	aliases {
+		csi40 = &csi40;
+	};
+
+	csi40: csi2@feaa0000 {
+		compatible = "renesas,csi2-r8a7795";
+		reg = <0 0xfeaa0000 0 0x10000>;
+		interrupts = <0 246 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&cpg CPG_MOD 716>;
+		power-domains = <&cpg>;
+		status = "disabled";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@1 {
+				reg = <1>;
+				csi40_out: endpoint@1 {
+					remote-endpoint = <&vin0csi40>;
+				};
+			};
+		};
+	};
+
+/* Board properties */
+
+	&csi40 {
+		status = "okay";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				csi40_in: endpoint@0 {
+					clock-lanes = <0>;
+					data-lanes = <1 2 3 4>;
+					remote-endpoint = <&adv7482_1_out>;
+				};
+			};
+		};
+	};
diff --git a/drivers/media/platform/rcar-vin/Kconfig b/drivers/media/platform/rcar-vin/Kconfig
index b2ff2d4..e0774ee 100644
--- a/drivers/media/platform/rcar-vin/Kconfig
+++ b/drivers/media/platform/rcar-vin/Kconfig
@@ -9,3 +9,14 @@ config VIDEO_RCAR_VIN
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called rcar-vin.
+
+config VIDEO_RCAR_CSI2
+	tristate "R-Car MIPI CSI-2 Interface driver"
+	depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && OF
+	depends on ARCH_RENESAS || COMPILE_TEST
+	---help---
+	  Support for Renesas R-Car MIPI CSI-2 interface driver.
+	  Supports R-Car Gen3 SoCs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called rcar-csi2.
diff --git a/drivers/media/platform/rcar-vin/Makefile b/drivers/media/platform/rcar-vin/Makefile
index 48c5632..81a37f2 100644
--- a/drivers/media/platform/rcar-vin/Makefile
+++ b/drivers/media/platform/rcar-vin/Makefile
@@ -1,3 +1,5 @@
 rcar-vin-objs = rcar-core.o rcar-dma.o rcar-v4l2.o
 
 obj-$(CONFIG_VIDEO_RCAR_VIN) += rcar-vin.o
+
+obj-$(CONFIG_VIDEO_RCAR_CSI2) += rcar-csi2.o
diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
new file mode 100644
index 0000000..c74b924
--- /dev/null
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -0,0 +1,545 @@
+/*
+ * Driver for Renesas R-Car MIPI CSI-2
+ *
+ * Copyright (C) 2016 Renesas Electronics Corp.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include <media/v4l2-of.h>
+#include <media/v4l2-subdev.h>
+
+/* Register offsets */
+#define TREF_REG		0x00 /* Control Timing Select */
+#define SRST_REG		0x04 /* Software Reset */
+#define PHYCNT_REG		0x08 /* PHY Operation Control */
+#define CHKSUM_REG		0x0C /* Checksum Control */
+#define VCDT_REG		0x10 /* Channel Data Type Select */
+#define VCDT2_REG		0x14 /* Channel Data Type Select 2 */
+#define FRDT_REG		0x18 /* Frame Data Type Select */
+#define FLD_REG			0x1C /* Field Detection Control */
+#define ASTBY_REG		0x20 /* Automatic Standby Control */
+#define LNGDT0_REG		0x28 /* Long Data Type Setting 0 */
+#define LNGDT1_REG		0x2C /* Long Data Type Setting 1 */
+#define INTEN_REG		0x30 /* Interrupt Enable */
+#define INTCLOSE_REG		0x34 /* Interrupt Source Mask */
+#define INTSTATE_REG		0x38 /* Interrupt Status Monitor */
+#define INTERRSTATE_REG		0x3C /* Interrupt Error Status Monitor */
+#define SHPDAT_REG		0x40 /* Short Packet Data */
+#define SHPCNT_REG		0x44 /* Short Packet Count */
+#define LINKCNT_REG		0x48 /* LINK Operation Control */
+#define LSWAP_REG		0x4C /* Lane Swap */
+#define PHTC_REG		0x58 /* PHY Test Interface Clear */
+#define PHYPLL_REG		0x68 /* PHY Frequency Control */
+#define PHEERM_REG		0x74 /* PHY ESC Error Monitor */
+#define PHCLM_REG		0x78 /* PHY Clock Lane Monitor */
+#define PHDLM_REG		0x7C /* PHY Data Lane Monitor */
+
+/* Control Timing Select bits */
+#define TREF_TREF			(1 << 0)
+
+/* Software Reset bits */
+#define SRST_SRST			(1 << 0)
+
+/* PHY Operation Control bits */
+#define PHYCNT_SHUTDOWNZ		(1 << 17)
+#define PHYCNT_RSTZ			(1 << 16)
+#define PHYCNT_ENABLECLK		(1 << 4)
+#define PHYCNT_ENABLE_3			(1 << 3)
+#define PHYCNT_ENABLE_2			(1 << 2)
+#define PHYCNT_ENABLE_1			(1 << 1)
+#define PHYCNT_ENABLE_0			(1 << 0)
+
+/* Checksum Control bits */
+#define CHKSUM_ECC_EN			(1 << 1)
+#define CHKSUM_CRC_EN			(1 << 0)
+
+/*
+ * Channel Data Type Select bits
+ * VCDT[0-15]:  Channel 1 VCDT[16-31]:  Channel 2
+ * VCDT2[0-15]: Channel 3 VCDT2[16-31]: Channel 4
+ */
+#define VCDT_VCDTN_EN			(1 << 15)
+#define VCDT_SEL_VC(n)			((n & 0x3) << 8)
+#define VCDT_SEL_DTN_ON			(1 << 6)
+#define VCDT_SEL_DT(n)			((n & 0x1f) << 0)
+
+/* Field Detection Control bits */
+#define FLD_FLD_NUM(n)			((n & 0xff) << 16)
+#define FLD_FLD_EN4			(1 << 3)
+#define FLD_FLD_EN3			(1 << 2)
+#define FLD_FLD_EN2			(1 << 1)
+#define FLD_FLD_EN			(1 << 0)
+
+/* LINK Operation Control bits */
+#define LINKCNT_MONITOR_EN		(1 << 31)
+#define LINKCNT_REG_MONI_PACT_EN	(1 << 25)
+#define LINKCNT_ICLK_NONSTOP		(1 << 24)
+
+/* Lane Swap bits */
+#define LSWAP_L3SEL(n)			((n & 0x3) << 6)
+#define LSWAP_L2SEL(n)			((n & 0x3) << 4)
+#define LSWAP_L1SEL(n)			((n & 0x3) << 2)
+#define LSWAP_L0SEL(n)			((n & 0x3) << 0)
+
+/* PHY Test Interface Clear bits */
+#define PHTC_TESTCLR			(1 << 0)
+
+/* PHY Frequency Control bits */
+#define PHYPLL_HSFREQRANGE_80MBPS	(0x00 << 16)
+#define PHYPLL_HSFREQRANGE_90MBPS	(0x10 << 16)
+#define PHYPLL_HSFREQRANGE_100MBPS	(0x20 << 16)
+#define PHYPLL_HSFREQRANGE_110MBPS	(0x30 << 16)
+#define PHYPLL_HSFREQRANGE_120MBPS	(0x01 << 16)
+#define PHYPLL_HSFREQRANGE_130MBPS	(0x11 << 16)
+#define PHYPLL_HSFREQRANGE_140MBPS	(0x21 << 16)
+#define PHYPLL_HSFREQRANGE_150MBPS	(0x31 << 16)
+#define PHYPLL_HSFREQRANGE_160MBPS	(0x02 << 16)
+#define PHYPLL_HSFREQRANGE_170MBPS	(0x12 << 16)
+#define PHYPLL_HSFREQRANGE_180MBPS	(0x22 << 16)
+#define PHYPLL_HSFREQRANGE_190MBPS	(0x32 << 16)
+#define PHYPLL_HSFREQRANGE_205MBPS	(0x03 << 16)
+#define PHYPLL_HSFREQRANGE_220MBPS	(0x13 << 16)
+#define PHYPLL_HSFREQRANGE_235MBPS	(0x23 << 16)
+#define PHYPLL_HSFREQRANGE_250MBPS	(0x33 << 16)
+#define PHYPLL_HSFREQRANGE_275MBPS	(0x04 << 16)
+#define PHYPLL_HSFREQRANGE_300MBPS	(0x14 << 16)
+#define PHYPLL_HSFREQRANGE_325MBPS	(0x05 << 16)
+#define PHYPLL_HSFREQRANGE_350MBPS	(0x15 << 16)
+#define PHYPLL_HSFREQRANGE_400MBPS	(0x25 << 16)
+#define PHYPLL_HSFREQRANGE_450MBPS	(0x06 << 16)
+#define PHYPLL_HSFREQRANGE_500MBPS	(0x16 << 16)
+#define PHYPLL_HSFREQRANGE_550MBPS	(0x07 << 16)
+#define PHYPLL_HSFREQRANGE_600MBPS	(0x17 << 16)
+#define PHYPLL_HSFREQRANGE_650MBPS	(0x08 << 16)
+#define PHYPLL_HSFREQRANGE_700MBPS	(0x18 << 16)
+#define PHYPLL_HSFREQRANGE_750MBPS	(0x09 << 16)
+#define PHYPLL_HSFREQRANGE_800MBPS	(0x19 << 16)
+#define PHYPLL_HSFREQRANGE_850MBPS	(0x29 << 16)
+#define PHYPLL_HSFREQRANGE_900MBPS	(0x39 << 16)
+#define PHYPLL_HSFREQRANGE_950MBPS	(0x0A << 16)
+#define PHYPLL_HSFREQRANGE_1000MBPS	(0x1A << 16)
+#define PHYPLL_HSFREQRANGE_1050MBPS	(0x2A << 16)
+#define PHYPLL_HSFREQRANGE_1100MBPS	(0x3A << 16)
+#define PHYPLL_HSFREQRANGE_1150MBPS	(0x0B << 16)
+#define PHYPLL_HSFREQRANGE_1200MBPS	(0x1B << 16)
+#define PHYPLL_HSFREQRANGE_1250MBPS	(0x2B << 16)
+#define PHYPLL_HSFREQRANGE_1300MBPS	(0x3B << 16)
+#define PHYPLL_HSFREQRANGE_1350MBPS	(0x0C << 16)
+#define PHYPLL_HSFREQRANGE_1400MBPS	(0x1C << 16)
+#define PHYPLL_HSFREQRANGE_1450MBPS	(0x2C << 16)
+#define PHYPLL_HSFREQRANGE_1500MBPS	(0x3C << 16)
+
+struct rcar_csi2 {
+	struct device *dev;
+	void __iomem *base;
+	spinlock_t lock;
+
+	unsigned short lanes;
+	unsigned char swap[4];
+
+	struct v4l2_subdev subdev;
+	struct v4l2_mbus_framefmt mf;
+};
+
+#define csi_dbg(p, fmt, arg...)		dev_dbg(p->dev, fmt, ##arg)
+#define csi_info(p, fmt, arg...)	dev_info(p->dev, fmt, ##arg)
+#define csi_warn(p, fmt, arg...)	dev_warn(p->dev, fmt, ##arg)
+#define csi_err(p, fmt, arg...)		dev_err(p->dev, fmt, ##arg)
+
+static irqreturn_t rcar_csi2_irq(int irq, void *data)
+{
+	struct rcar_csi2 *priv = data;
+	u32 int_status;
+	unsigned int handled = 0;
+
+	spin_lock(&priv->lock);
+
+	int_status = ioread32(priv->base + INTSTATE_REG);
+	if (!int_status)
+		goto done;
+
+	/* ack interrupts */
+	iowrite32(int_status, priv->base + INTSTATE_REG);
+	handled = 1;
+
+done:
+	spin_unlock(&priv->lock);
+
+	return IRQ_RETVAL(handled);
+
+}
+
+static void rcar_csi2_reset(struct rcar_csi2 *priv)
+{
+	iowrite32(SRST_SRST, priv->base + SRST_REG);
+	udelay(5);
+	iowrite32(0, priv->base + SRST_REG);
+}
+
+static void rcar_csi2_wait_phy_start(struct rcar_csi2 *priv)
+{
+	int timeout;
+
+	/* Read the PHY clock lane monitor register (PHCLM). */
+	for (timeout = 100; timeout >= 0; timeout--) {
+		if (ioread32(priv->base + PHCLM_REG) & 0x01) {
+			csi_dbg(priv, "Detected the PHY clock lane\n");
+			break;
+		}
+		msleep(20);
+	}
+	if (!timeout)
+		csi_err(priv, "Timeout of reading the PHY clock lane\n");
+
+
+	/* Read the PHY data lane monitor register (PHDLM). */
+	for (timeout = 100; timeout >= 0; timeout--) {
+		if (ioread32(priv->base + PHDLM_REG) & 0x01) {
+			csi_dbg(priv, "Detected the PHY data lane\n");
+			break;
+		}
+		msleep(20);
+	}
+	if (!timeout)
+		csi_err(priv, "Timeout of reading the PHY data lane\n");
+
+}
+
+static int rcar_csi2_start(struct rcar_csi2 *priv)
+{
+	u32 fld, phycnt, phypll, vcdt, vcdt2, tmp, pixels;
+	int i;
+
+	csi_dbg(priv, "Input size (%dx%d%c)\n", priv->mf.width, priv->mf.height,
+		priv->mf.field == V4L2_FIELD_NONE ? 'p' : 'i');
+
+	vcdt = vcdt2 = 0;
+	for (i = 0; i < priv->lanes; i++) {
+		tmp = VCDT_SEL_VC(i) | VCDT_VCDTN_EN | VCDT_SEL_DTN_ON;
+
+		switch (priv->mf.code) {
+		case MEDIA_BUS_FMT_RGB888_1X24:
+			/* 24 == RGB888 */
+			tmp |= 0x24;
+			break;
+		case MEDIA_BUS_FMT_YUYV8_1X16:
+		case MEDIA_BUS_FMT_YUYV8_2X8:
+		case MEDIA_BUS_FMT_YUYV10_2X10:
+			/* 1E == YUV422 8-bit */
+			tmp |= 0x1e;
+			break;
+		default:
+			csi_warn(priv,
+				 "Unknown media bus format, try it anyway\n");
+			break;
+		}
+
+		/* Store in correct reg and offset */
+		if (i < 2)
+			vcdt |= tmp << ((i % 2) * 16);
+		else
+			vcdt2 |= tmp << ((i % 2) * 16);
+	}
+
+	switch (priv->lanes) {
+	case 1:
+		fld = FLD_FLD_NUM(1) | FLD_FLD_EN;
+		phycnt = PHYCNT_ENABLECLK | PHYCNT_ENABLE_0;
+		phypll = PHYPLL_HSFREQRANGE_400MBPS;
+		break;
+	case 4:
+		fld = FLD_FLD_NUM(2) | FLD_FLD_EN4 | FLD_FLD_EN3 |
+			FLD_FLD_EN2 | FLD_FLD_EN;
+		phycnt = PHYCNT_ENABLECLK | PHYCNT_ENABLE_3 |
+			PHYCNT_ENABLE_2 | PHYCNT_ENABLE_1 | PHYCNT_ENABLE_0;
+
+		/* Calculate MBPS per lane, assume 32 bits per pixel at 60Hz */
+		pixels = (priv->mf.width * priv->mf.height) /
+			(priv->mf.field == V4L2_FIELD_NONE ? 1 : 2);
+		if (pixels <= 640 * 480)
+			phypll = PHYPLL_HSFREQRANGE_100MBPS;
+		else if (pixels <= 720 * 576)
+			phypll = PHYPLL_HSFREQRANGE_190MBPS;
+		else if (pixels <= 1280 * 720)
+			phypll = PHYPLL_HSFREQRANGE_450MBPS;
+		else if (pixels <= 1920 * 1080)
+			phypll = PHYPLL_HSFREQRANGE_900MBPS;
+		else
+			goto error;
+
+		break;
+	default:
+		goto error;
+	}
+
+	/* Init */
+	iowrite32(TREF_TREF, priv->base + TREF_REG);
+	rcar_csi2_reset(priv);
+	iowrite32(0, priv->base + PHTC_REG);
+
+	/* Configure */
+	iowrite32(fld, priv->base + FLD_REG);
+	iowrite32(vcdt, priv->base + VCDT_REG);
+	iowrite32(vcdt2, priv->base + VCDT2_REG);
+	iowrite32(LSWAP_L0SEL(priv->swap[0]) | LSWAP_L1SEL(priv->swap[1]) |
+		  LSWAP_L2SEL(priv->swap[2]) | LSWAP_L3SEL(priv->swap[3]),
+		  priv->base + LSWAP_REG);
+
+	/* Start */
+	iowrite32(phypll, priv->base + PHYPLL_REG);
+	iowrite32(phycnt, priv->base + PHYCNT_REG);
+	iowrite32(LINKCNT_MONITOR_EN | LINKCNT_REG_MONI_PACT_EN |
+		  LINKCNT_ICLK_NONSTOP, priv->base + LINKCNT_REG);
+	iowrite32(phycnt | PHYCNT_SHUTDOWNZ, priv->base + PHYCNT_REG);
+	iowrite32(phycnt | PHYCNT_SHUTDOWNZ | PHYCNT_RSTZ,
+		  priv->base + PHYCNT_REG);
+
+	rcar_csi2_wait_phy_start(priv);
+
+	return 0;
+error:
+	csi_err(priv, "Unsupported resolution (%dx%d%c)\n",
+		priv->mf.width, priv->mf.height,
+		priv->mf.field == V4L2_FIELD_NONE ? 'p' : 'i');
+
+	return -EINVAL;
+}
+
+static void rcar_csi2_stop(struct rcar_csi2 *priv)
+{
+	iowrite32(0, priv->base + PHYCNT_REG);
+
+	rcar_csi2_reset(priv);
+}
+
+static int rcar_csi2_s_stream(struct v4l2_subdev *sd, unsigned int pad,
+			      int enable)
+{
+	struct rcar_csi2 *priv = container_of(sd, struct rcar_csi2, subdev);
+
+	if (enable)
+		return rcar_csi2_start(priv);
+
+	rcar_csi2_stop(priv);
+
+	return 0;
+}
+
+static int rcar_csi2_set_pad_format(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_pad_config *cfg,
+				    struct v4l2_subdev_format *format)
+{
+	struct rcar_csi2 *priv = container_of(sd, struct rcar_csi2, subdev);
+
+	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+		priv->mf = format->format;
+
+	return 0;
+}
+
+static int rcar_csi2_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct rcar_csi2 *priv = container_of(sd, struct rcar_csi2, subdev);
+
+	if (on)
+		pm_runtime_get_sync(priv->dev);
+	else
+		pm_runtime_put_sync(priv->dev);
+
+	return 0;
+}
+
+static const struct v4l2_subdev_video_ops rcar_csi2_video_ops = {
+};
+
+static struct v4l2_subdev_core_ops rcar_csi2_subdev_core_ops = {
+	.s_power = rcar_csi2_s_power,
+};
+
+static const struct v4l2_subdev_pad_ops rcar_csi2_pad_ops = {
+	.s_stream = rcar_csi2_s_stream,
+	.set_fmt = rcar_csi2_set_pad_format,
+};
+
+static struct v4l2_subdev_ops rcar_csi2_subdev_ops = {
+	.video	= &rcar_csi2_video_ops,
+	.core	= &rcar_csi2_subdev_core_ops,
+	.pad	= &rcar_csi2_pad_ops,
+};
+
+/* -----------------------------------------------------------------------------
+ * Platform Device Driver
+ */
+
+static const struct of_device_id rcar_csi2_of_table[] = {
+	{ .compatible = "renesas,csi2-r8a7795" },
+	{ .compatible = "renesas,rcar-gen3-csi2" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, rcar_csi2_of_table);
+
+static int rcar_csi2_parse_dt(struct rcar_csi2 *priv)
+{
+	struct v4l2_of_endpoint v4l2_ep;
+	struct device_node *ep;
+	int i, n, ret;
+
+	ep = of_graph_get_endpoint_by_regs(priv->dev->of_node, 0, 0);
+	if (!ep)
+		return -EINVAL;
+
+	ret = v4l2_of_parse_endpoint(ep, &v4l2_ep);
+	of_node_put(ep);
+	if (ret) {
+		csi_err(priv, "Could not parse v4l2 endpoint\n");
+		return -EINVAL;
+	}
+
+	if (v4l2_ep.bus_type != V4L2_MBUS_CSI2) {
+		csi_err(priv, "Unsupported media bus type for %s\n",
+			of_node_full_name(ep));
+		return -EINVAL;
+	}
+
+	switch (v4l2_ep.bus.mipi_csi2.num_data_lanes) {
+	case 1:
+	case 4:
+		priv->lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes;
+		break;
+	default:
+		csi_err(priv, "Unsupported number of lanes\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < 4; i++)
+		priv->swap[i] = i;
+
+	for (i = 0; i < priv->lanes; i++) {
+		/* Check for valid lane number */
+		if (v4l2_ep.bus.mipi_csi2.data_lanes[i] < 1 ||
+		    v4l2_ep.bus.mipi_csi2.data_lanes[i] > 4) {
+			csi_err(priv, "data lanes must be in 1-4 range\n");
+			return -EINVAL;
+		}
+
+		/* Use lane numbers 0-3 internally */
+		priv->swap[i] = v4l2_ep.bus.mipi_csi2.data_lanes[i] - 1;
+
+
+	}
+
+	/* Make sure there are no duplicates */
+	for (i = 0; i < priv->lanes; i++) {
+		for (n = i + 1; n < priv->lanes; n++) {
+			if (priv->swap[i] == priv->swap[n]) {
+				csi_err(priv,
+					"Requested swapping not possible\n");
+				return -EINVAL;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int rcar_csi2_probe_resources(struct rcar_csi2 *priv,
+				     struct platform_device *pdev)
+{
+	struct resource *mem;
+	int irq;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem)
+		return -ENODEV;
+
+	priv->base = devm_ioremap_resource(&pdev->dev, mem);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	irq = platform_get_irq(pdev, 0);
+	if (!irq)
+		return -ENODEV;
+
+	return devm_request_irq(&pdev->dev, irq, rcar_csi2_irq, IRQF_SHARED,
+				dev_name(&pdev->dev), priv);
+}
+
+static int rcar_csi2_probe(struct platform_device *pdev)
+{
+	struct rcar_csi2 *priv;
+	int ret;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(struct rcar_csi2), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+
+	priv->dev = &pdev->dev;
+	spin_lock_init(&priv->lock);
+
+	ret = rcar_csi2_parse_dt(priv);
+	if (ret)
+		return ret;
+
+	ret = rcar_csi2_probe_resources(priv, pdev);
+	if (ret) {
+		csi_err(priv, "Failed to get resources\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->subdev.owner = THIS_MODULE;
+	priv->subdev.dev = &pdev->dev;
+	v4l2_subdev_init(&priv->subdev, &rcar_csi2_subdev_ops);
+	v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
+	snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "rcar_csi2.%s",
+		 dev_name(&pdev->dev));
+
+	ret = v4l2_async_register_subdev(&priv->subdev);
+	if (ret < 0)
+		return ret;
+
+	pm_runtime_enable(&pdev->dev);
+
+	csi_info(priv, "%d lanes found\n", priv->lanes);
+
+	return 0;
+}
+
+static int rcar_csi2_remove(struct platform_device *pdev)
+{
+	struct rcar_csi2 *priv = platform_get_drvdata(pdev);
+
+	v4l2_async_unregister_subdev(&priv->subdev);
+
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+static struct platform_driver __refdata rcar_csi2_pdrv = {
+	.remove	= rcar_csi2_remove,
+	.probe	= rcar_csi2_probe,
+	.driver	= {
+		.name	= "rcar-csi2",
+		.of_match_table	= of_match_ptr(rcar_csi2_of_table),
+	},
+};
+
+module_platform_driver(rcar_csi2_pdrv);
+
+MODULE_AUTHOR("Niklas Söderlund <niklas.soderlund@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Renesas R-Car MIPI CSI-2 driver");
+MODULE_LICENSE("GPL v2");
-- 
2.8.3

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