[PATCH RFC v5 1/6] s5p-csis: Add device tree support
Sylwester Nawrocki
s.nawrocki at samsung.com
Sat Mar 9 03:46:01 EST 2013
This patch support for binding the driver to the MIPI-CSIS
devices instantiated from device tree and parsing the SoC
and board specific properties. The MIPI CSI-2 channel is
determined by the value of reg property placed in csis'
port subnode.
Signed-off-by: Sylwester Nawrocki <s.nawrocki at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
Changes since v4:
- dropped node aliases, the IP instances are now identified
by the port's node reg property value; as a side effect this
introduces dependency on the s5p_fimc.h header,
- re-added bus-width property, so the number of data lanes
supported per each IP instance can be specified in the
device tree,
- the bindings documentation moved to Documentation/
devicetree/bindings/media/samsung-mipi-csis.txt.
- "samsung,exynos3110-csis" renamed to "samsung,s5pv210-csis",
updated the bindings documentation.
Changes since v3:
- dropped 'bus-width' property, hard coded the number of supported
data lanes per device also in dt case, it can be derived from the
compatible property if required;
- "samsung,s5pv210-csis" renamed to "samsung,exynos3110-csis",
updated the bindings description.
---
.../bindings/media/samsung-mipi-csis.txt | 80 ++++++++++
drivers/media/platform/s5p-fimc/mipi-csis.c | 160 +++++++++++++++-----
drivers/media/platform/s5p-fimc/mipi-csis.h | 1 +
include/media/s5p_fimc.h | 13 ++
4 files changed, 219 insertions(+), 35 deletions(-)
create mode 100644 Documentation/devicetree/bindings/media/samsung-mipi-csis.txt
diff --git a/Documentation/devicetree/bindings/media/samsung-mipi-csis.txt b/Documentation/devicetree/bindings/media/samsung-mipi-csis.txt
new file mode 100644
index 0000000..911703c
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/samsung-mipi-csis.txt
@@ -0,0 +1,80 @@
+Samsung S5P/EXYNOS SoC series MIPI CSI-2 receiver (MIPI CSIS)
+-------------------------------------------------------------
+
+Required properties:
+
+- compatible : "samsung,s5pv210-csis" for S5PV210 (S5PC110) SoCs;
+ "samsung,exynos4210-csis" for Exynos4210 (S5PC210, S5PV310)
+ and "samsung,<chip_name>-csis", "samsung,exynos4210-csis"
+ for later SoCs having MIPI-CSIS IP block compatible with
+ Exynos4210;
+- reg : physical base address and size of the device memory mapped
+ registers;
+- interrupts : should contain MIPI CSIS interrupt; the format of the
+ interrupt specifier depends on the interrupt controller;
+- bus-width : maximum number of data lanes supported (SoC specific);
+- vddio-supply : MIPI CSIS I/O and PLL voltage supply (e.g. 1.8V);
+- vddcore-supply : MIPI CSIS Core voltage supply (e.g. 1.1V).
+
+Optional properties:
+
+- clock-frequency : The IP's main (system bus) clock frequency in Hz, default
+ value when this property is not specified is 166 MHz;
+- samsung,csis-wclk : CSI-2 wrapper clock selection. If this property is present
+ external clock from CMU will be used, if not bus clock will
+ be selected.
+
+The device node should contain one 'port' child node with one child 'endpoint'
+node, as outlined in the common media bindings specification. See
+Documentation/devicetree/bindings/media/video-interfaces.txt for details.
+The following are properties specific to these nodes.
+
+port node
+---------
+
+- reg : (required) must be 3 for camera C input (CSIS0) or 4 for
+ camera D input (CSIS1);
+
+endpoint node
+-------------
+
+- data-lanes : (required) an array specifying active physical MIPI-CSI2
+ data input lanes and their mapping to logical lanes; the
+ array's content is unused, only its length is meaningful;
+
+- samsung,csis-hs-settle : (optional) differential receiver (HS-RX) settle time;
+
+
+Example:
+
+ reg0: regulator at 0 {
+ };
+
+ reg1: regulator at 1 {
+ };
+
+/* SoC properties */
+
+ csis_0: csis at 11880000 {
+ compatible = "samsung,exynos4210-csis";
+ reg = <0x11880000 0x1000>;
+ interrupts = <0 78 0>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ };
+
+/* Board properties */
+
+ csis_0: csis at 11880000 {
+ clock-frequency = <166000000>;
+ vddio-supply = <®0>;
+ vddcore-supply = <®1>;
+ port {
+ reg = <3>; /* 3 - CSIS0, 4 - CSIS1 */
+ csis0_ep: endpoint {
+ remote-endpoint = <...>;
+ data-lanes = <1>, <2>;
+ samsung,csis-hs-settle = <12>;
+ };
+ };
+ };
diff --git a/drivers/media/platform/s5p-fimc/mipi-csis.c b/drivers/media/platform/s5p-fimc/mipi-csis.c
index 981863d..4673625 100644
--- a/drivers/media/platform/s5p-fimc/mipi-csis.c
+++ b/drivers/media/platform/s5p-fimc/mipi-csis.c
@@ -19,14 +19,18 @@
#include <linux/kernel.h>
#include <linux/memory.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_data/mipi-csis.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/videodev2.h>
+#include <media/s5p_fimc.h>
+#include <media/v4l2-of.h>
#include <media/v4l2-subdev.h>
-#include <linux/platform_data/mipi-csis.h>
+
#include "mipi-csis.h"
static int debug;
@@ -113,6 +117,7 @@ static char *csi_clock_name[] = {
[CSIS_CLK_GATE] = "csis",
};
#define NUM_CSIS_CLOCKS ARRAY_SIZE(csi_clock_name)
+#define DEFAULT_SCLK_CSIS_FREQ 166000000UL
static const char * const csis_supply_name[] = {
"vddcore", /* CSIS Core (1.0V, 1.1V or 1.2V) suppply */
@@ -167,6 +172,11 @@ struct csis_pktbuf {
* @clock: CSIS clocks
* @irq: requested s5p-mipi-csis irq number
* @flags: the state variable for power and streaming control
+ * @clock_frequency: device bus clock frequency
+ * @hs_settle: HS-RX settle time
+ * @num_lanes: number of MIPI-CSI data lanes used
+ * @max_num_lanes: maximum number of MIPI-CSI data lanes supported
+ * @wclk_ext: CSI wrapper clock: 0 - bus clock, 1 - external SCLK_CAM
* @csis_fmt: current CSIS pixel format
* @format: common media bus format for the source and sink pad
* @slock: spinlock protecting structure members below
@@ -184,6 +194,13 @@ struct csis_state {
struct clk *clock[NUM_CSIS_CLOCKS];
int irq;
u32 flags;
+
+ u32 clk_frequency;
+ u32 hs_settle;
+ u32 num_lanes;
+ u32 max_num_lanes;
+ u8 wclk_ext;
+
const struct csis_pix_format *csis_fmt;
struct v4l2_mbus_framefmt format;
@@ -273,7 +290,6 @@ static void s5pcsis_reset(struct csis_state *state)
static void s5pcsis_system_enable(struct csis_state *state, int on)
{
- struct s5p_platform_mipi_csis *pdata = state->pdev->dev.platform_data;
u32 val, mask;
val = s5pcsis_read(state, S5PCSIS_CTRL);
@@ -286,7 +302,7 @@ static void s5pcsis_system_enable(struct csis_state *state, int on)
val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
val &= ~S5PCSIS_DPHYCTRL_ENABLE;
if (on) {
- mask = (1 << (pdata->lanes + 1)) - 1;
+ mask = (1 << (state->num_lanes + 1)) - 1;
val |= (mask & S5PCSIS_DPHYCTRL_ENABLE);
}
s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
@@ -321,15 +337,14 @@ static void s5pcsis_set_hsync_settle(struct csis_state *state, int settle)
static void s5pcsis_set_params(struct csis_state *state)
{
- struct s5p_platform_mipi_csis *pdata = state->pdev->dev.platform_data;
u32 val;
val = s5pcsis_read(state, S5PCSIS_CONFIG);
- val = (val & ~S5PCSIS_CFG_NR_LANE_MASK) | (pdata->lanes - 1);
+ val = (val & ~S5PCSIS_CFG_NR_LANE_MASK) | (state->num_lanes - 1);
s5pcsis_write(state, S5PCSIS_CONFIG, val);
__s5pcsis_set_format(state);
- s5pcsis_set_hsync_settle(state, pdata->hs_settle);
+ s5pcsis_set_hsync_settle(state, state->hs_settle);
val = s5pcsis_read(state, S5PCSIS_CTRL);
if (state->csis_fmt->data_alignment == 32)
@@ -338,7 +353,7 @@ static void s5pcsis_set_params(struct csis_state *state)
val &= ~S5PCSIS_CTRL_ALIGN_32BIT;
val &= ~S5PCSIS_CTRL_WCLK_EXTCLK;
- if (pdata->wclk_source)
+ if (state->wclk_ext)
val |= S5PCSIS_CTRL_WCLK_EXTCLK;
s5pcsis_write(state, S5PCSIS_CTRL, val);
@@ -701,52 +716,116 @@ static irqreturn_t s5pcsis_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static int s5pcsis_get_platform_data(struct platform_device *pdev,
+ struct csis_state *state)
+{
+ struct s5p_platform_mipi_csis *pdata = pdev->dev.platform_data;
+
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "Platform data not specified\n");
+ return -EINVAL;
+ }
+
+ state->clk_frequency = pdata->clk_rate;
+ state->num_lanes = pdata->lanes;
+ state->hs_settle = pdata->hs_settle;
+ state->index = max(0, pdev->id);
+ state->max_num_lanes = state->index ? CSIS1_MAX_LANES :
+ CSIS0_MAX_LANES;
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static int s5pcsis_parse_dt(struct platform_device *pdev,
+ struct csis_state *state)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct v4l2_of_endpoint endpoint;
+ struct device_node *port;
+ u32 reg;
+
+ if (of_property_read_u32(node, "clock-frequency",
+ &state->clk_frequency))
+ state->clk_frequency = DEFAULT_SCLK_CSIS_FREQ;
+ if (of_property_read_u32(node, "bus-width",
+ &state->max_num_lanes))
+ return -EINVAL;
+
+ /* Get port node and validate MIPI-CSI channel id. */
+ port = of_get_child_by_name(node, "port");
+ if (!port) {
+ dev_err(&pdev->dev, "No port node at %s\n",
+ node->full_name);
+ return -EINVAL;
+ }
+ of_property_read_u32(port, "reg", ®);
+ state->index = reg - FIMC_INPUT_MIPI_CSI2_0;
+ if (state->index < 0 || state->index >= CSIS_MAX_ENTITIES)
+ return -ENXIO;
+
+ /* Get MIPI CSI-2 bus configration from the endpoint node. */
+ node = of_get_child_by_name(port, "endpoint");
+ of_node_put(port);
+ if (!node)
+ return 0;
+ of_property_read_u32(node, "samsung,csis-hs-settle",
+ &state->hs_settle);
+ state->wclk_ext = of_property_read_bool(node,
+ "samsung,csis-wclk");
+ v4l2_of_parse_csi_bus(node, &endpoint);
+ state->num_lanes = endpoint.mbus.mipi_csi2.num_data_lanes;
+
+ of_node_put(node);
+ return 0;
+}
+#else
+#define s5pcsis_parse_dt(pdev, state) (-ENOSYS)
+#endif
+
static int s5pcsis_probe(struct platform_device *pdev)
{
- struct s5p_platform_mipi_csis *pdata;
+ struct device *dev = &pdev->dev;
struct resource *mem_res;
struct csis_state *state;
int ret = -ENOMEM;
int i;
- state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL);
+ state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
if (!state)
return -ENOMEM;
mutex_init(&state->lock);
spin_lock_init(&state->slock);
-
state->pdev = pdev;
- state->index = max(0, pdev->id);
- pdata = pdev->dev.platform_data;
- if (pdata == NULL) {
- dev_err(&pdev->dev, "Platform data not fully specified\n");
- return -EINVAL;
- }
+ if (dev->of_node)
+ ret = s5pcsis_parse_dt(pdev, state);
+ else
+ ret = s5pcsis_get_platform_data(pdev, state);
+ if (ret < 0)
+ return ret;
- if ((state->index == 1 && pdata->lanes > CSIS1_MAX_LANES) ||
- pdata->lanes > CSIS0_MAX_LANES) {
- dev_err(&pdev->dev, "Unsupported number of data lanes: %d\n",
- pdata->lanes);
+ if (state->num_lanes == 0 || state->num_lanes > state->max_num_lanes) {
+ dev_err(dev, "Unsupported number of data lanes: %d (max. %d)\n",
+ state->num_lanes, state->max_num_lanes);
return -EINVAL;
}
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- state->regs = devm_ioremap_resource(&pdev->dev, mem_res);
+ state->regs = devm_ioremap_resource(dev, mem_res);
if (IS_ERR(state->regs))
return PTR_ERR(state->regs);
state->irq = platform_get_irq(pdev, 0);
if (state->irq < 0) {
- dev_err(&pdev->dev, "Failed to get irq\n");
+ dev_err(dev, "Failed to get irq\n");
return state->irq;
}
for (i = 0; i < CSIS_NUM_SUPPLIES; i++)
state->supplies[i].supply = csis_supply_name[i];
- ret = devm_regulator_bulk_get(&pdev->dev, CSIS_NUM_SUPPLIES,
+ ret = devm_regulator_bulk_get(dev, CSIS_NUM_SUPPLIES,
state->supplies);
if (ret)
return ret;
@@ -755,11 +834,11 @@ static int s5pcsis_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
- if (pdata->clk_rate)
+ if (state->clk_frequency)
ret = clk_set_rate(state->clock[CSIS_CLK_MUX],
- pdata->clk_rate);
+ state->clk_frequency);
else
- dev_WARN(&pdev->dev, "No clock frequency specified!\n");
+ dev_WARN(dev, "No clock frequency specified!\n");
if (ret < 0)
goto e_clkput;
@@ -767,16 +846,17 @@ static int s5pcsis_probe(struct platform_device *pdev)
if (ret < 0)
goto e_clkput;
- ret = devm_request_irq(&pdev->dev, state->irq, s5pcsis_irq_handler,
- 0, dev_name(&pdev->dev), state);
+ ret = devm_request_irq(dev, state->irq, s5pcsis_irq_handler,
+ 0, dev_name(dev), state);
if (ret) {
- dev_err(&pdev->dev, "Interrupt request failed\n");
+ dev_err(dev, "Interrupt request failed\n");
goto e_clkdis;
}
v4l2_subdev_init(&state->sd, &s5pcsis_subdev_ops);
state->sd.owner = THIS_MODULE;
- strlcpy(state->sd.name, dev_name(&pdev->dev), sizeof(state->sd.name));
+ snprintf(state->sd.name, sizeof(state->sd.name), "%s.%d",
+ CSIS_SUBDEV_NAME, state->index);
state->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
state->csis_fmt = &s5pcsis_formats[0];
@@ -796,10 +876,12 @@ static int s5pcsis_probe(struct platform_device *pdev)
/* .. and a pointer to the subdev. */
platform_set_drvdata(pdev, &state->sd);
-
memcpy(state->events, s5pcsis_events, sizeof(state->events));
+ pm_runtime_enable(dev);
- pm_runtime_enable(&pdev->dev);
+ dev_info(&pdev->dev, "lanes: %d, hs_settle: %d, wclk: %d, freq: %u\n",
+ state->num_lanes, state->hs_settle, state->wclk_ext,
+ state->clk_frequency);
return 0;
e_clkdis:
@@ -923,13 +1005,21 @@ static const struct dev_pm_ops s5pcsis_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(s5pcsis_suspend, s5pcsis_resume)
};
+static const struct of_device_id s5pcsis_of_match[] = {
+ { .compatible = "samsung,s5pv210-csis" },
+ { .compatible = "samsung,exynos4210-csis" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, s5pcsis_of_match);
+
static struct platform_driver s5pcsis_driver = {
.probe = s5pcsis_probe,
.remove = s5pcsis_remove,
.driver = {
- .name = CSIS_DRIVER_NAME,
- .owner = THIS_MODULE,
- .pm = &s5pcsis_pm_ops,
+ .of_match_table = s5pcsis_of_match,
+ .name = CSIS_DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .pm = &s5pcsis_pm_ops,
},
};
diff --git a/drivers/media/platform/s5p-fimc/mipi-csis.h b/drivers/media/platform/s5p-fimc/mipi-csis.h
index 2709286..28c11c4 100644
--- a/drivers/media/platform/s5p-fimc/mipi-csis.h
+++ b/drivers/media/platform/s5p-fimc/mipi-csis.h
@@ -11,6 +11,7 @@
#define S5P_MIPI_CSIS_H_
#define CSIS_DRIVER_NAME "s5p-mipi-csis"
+#define CSIS_SUBDEV_NAME CSIS_DRIVER_NAME
#define CSIS_MAX_ENTITIES 2
#define CSIS0_MAX_LANES 4
#define CSIS1_MAX_LANES 2
diff --git a/include/media/s5p_fimc.h b/include/media/s5p_fimc.h
index 28f3590..d6dbb79 100644
--- a/include/media/s5p_fimc.h
+++ b/include/media/s5p_fimc.h
@@ -15,6 +15,19 @@
#include <media/media-entity.h>
/*
+ * Enumeration of data inputs to the camera subsystem.
+ */
+enum fimc_input {
+ FIMC_INPUT_PARALLEL_0 = 1,
+ FIMC_INPUT_PARALLEL_1,
+ FIMC_INPUT_MIPI_CSI2_0 = 3,
+ FIMC_INPUT_MIPI_CSI2_1,
+ FIMC_INPUT_WRITEBACK_A = 5,
+ FIMC_INPUT_WRITEBACK_B,
+ FIMC_INPUT_WRITEBACK_ISP = 5,
+};
+
+/*
* Enumeration of the FIMC data bus types.
*/
enum fimc_bus_type {
--
1.7.9.5
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