From 25614824685247e00b786032a504f10bfab347b1 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Fri, 17 Jul 2015 11:02:55 -0300 Subject: [PATCH] [media] tc358743: support probe from device tree Add support for probing the TC358743 subdevice from device tree. The reference clock must be supplied using the common clock bindings. MIPI CSI-2 specific properties are parsed from the OF graph endpoint node and support for a non-continuous MIPI CSI-2 clock is added. Signed-off-by: Philipp Zabel Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- .../bindings/media/i2c/tc358743.txt | 48 ++++++ drivers/media/i2c/tc358743.c | 155 +++++++++++++++++- 2 files changed, 197 insertions(+), 6 deletions(-) create mode 100644 Documentation/devicetree/bindings/media/i2c/tc358743.txt diff --git a/Documentation/devicetree/bindings/media/i2c/tc358743.txt b/Documentation/devicetree/bindings/media/i2c/tc358743.txt new file mode 100644 index 000000000000..5218921629ed --- /dev/null +++ b/Documentation/devicetree/bindings/media/i2c/tc358743.txt @@ -0,0 +1,48 @@ +* Toshiba TC358743 HDMI-RX to MIPI CSI2-TX Bridge + +The Toshiba TC358743 HDMI-RX to MIPI CSI2-TX (H2C) is a bridge that converts +a HDMI stream to MIPI CSI-2 TX. It is programmable through I2C. + +Required Properties: + +- compatible: value should be "toshiba,tc358743" +- clocks, clock-names: should contain a phandle link to the reference clock + source, the clock input is named "refclk". + +Optional Properties: + +- reset-gpios: gpio phandle GPIO connected to the reset pin +- interrupts, interrupt-parent: GPIO connected to the interrupt pin +- data-lanes: should be <1 2 3 4> for four-lane operation, + or <1 2> for two-lane operation +- clock-lanes: should be <0> +- clock-noncontinuous: Presence of this boolean property decides whether the + MIPI CSI-2 clock is continuous or non-continuous. +- link-frequencies: List of allowed link frequencies in Hz. Each frequency is + expressed as a 64-bit big-endian integer. The frequency + is half of the bps per lane due to DDR transmission. + +For further information on the MIPI CSI-2 endpoint node properties, see +Documentation/devicetree/bindings/media/video-interfaces.txt. + +Example: + + tc358743@0f { + compatible = "toshiba,tc358743"; + reg = <0x0f>; + clocks = <&hdmi_osc>; + clock-names = "refclk"; + reset-gpios = <&gpio6 9 GPIO_ACTIVE_LOW>; + interrupt-parent = <&gpio2>; + interrupts = <5 IRQ_TYPE_LEVEL_HIGH>; + + port { + tc358743_out: endpoint { + remote-endpoint = <&mipi_csi2_in>; + data-lanes = <1 2 3 4>; + clock-lanes = <0>; + clock-noncontinuous; + link-frequencies = /bits/ 64 <297000000>; + }; + }; + }; diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c index 0ccae3308b68..76d0aaa19493 100644 --- a/drivers/media/i2c/tc358743.c +++ b/drivers/media/i2c/tc358743.c @@ -29,7 +29,9 @@ #include #include #include +#include #include +#include #include #include #include @@ -37,6 +39,7 @@ #include #include #include +#include #include #include "tc358743_regs.h" @@ -69,6 +72,7 @@ static const struct v4l2_dv_timings_cap tc358743_timings_cap = { struct tc358743_state { struct tc358743_platform_data pdata; + struct v4l2_of_bus_mipi_csi2 bus; struct v4l2_subdev sd; struct media_pad pad; struct v4l2_ctrl_handler hdl; @@ -90,6 +94,8 @@ struct tc358743_state { struct v4l2_dv_timings timings; u32 mbus_fmt_code; + + struct gpio_desc *reset_gpio; }; static void tc358743_enable_interrupts(struct v4l2_subdev *sd, @@ -700,7 +706,8 @@ static void tc358743_set_csi(struct v4l2_subdev *sd) ((lanes > 2) ? MASK_D2M_HSTXVREGEN : 0x0) | ((lanes > 3) ? MASK_D3M_HSTXVREGEN : 0x0)); - i2c_wr32(sd, TXOPTIONCNTRL, MASK_CONTCLKMODE); + i2c_wr32(sd, TXOPTIONCNTRL, (state->bus.flags & + V4L2_MBUS_CSI2_CONTINUOUS_CLOCK) ? MASK_CONTCLKMODE : 0); i2c_wr32(sd, STARTCNTRL, MASK_START); i2c_wr32(sd, CSI_START, MASK_STRT); @@ -1638,6 +1645,136 @@ static const struct v4l2_ctrl_config tc358743_ctrl_audio_present = { /* --------------- PROBE / REMOVE --------------- */ +#ifdef CONFIG_OF +static void tc358743_gpio_reset(struct tc358743_state *state) +{ + gpiod_set_value(state->reset_gpio, 0); + usleep_range(5000, 10000); + gpiod_set_value(state->reset_gpio, 1); + usleep_range(1000, 2000); + gpiod_set_value(state->reset_gpio, 0); + msleep(20); +} + +static int tc358743_probe_of(struct tc358743_state *state) +{ + struct device *dev = &state->i2c_client->dev; + struct v4l2_of_endpoint *endpoint; + struct device_node *ep; + struct clk *refclk; + u32 bps_pr_lane; + int ret = -EINVAL; + + refclk = devm_clk_get(dev, "refclk"); + if (IS_ERR(refclk)) { + if (PTR_ERR(refclk) != -EPROBE_DEFER) + dev_err(dev, "failed to get refclk: %ld\n", + PTR_ERR(refclk)); + return PTR_ERR(refclk); + } + + ep = of_graph_get_next_endpoint(dev->of_node, NULL); + if (!ep) { + dev_err(dev, "missing endpoint node\n"); + return -EINVAL; + } + + endpoint = v4l2_of_alloc_parse_endpoint(ep); + if (IS_ERR(endpoint)) { + dev_err(dev, "failed to parse endpoint\n"); + return PTR_ERR(endpoint); + } + + if (endpoint->bus_type != V4L2_MBUS_CSI2 || + endpoint->bus.mipi_csi2.num_data_lanes == 0 || + endpoint->nr_of_link_frequencies == 0) { + dev_err(dev, "missing CSI-2 properties in endpoint\n"); + goto free_endpoint; + } + + state->bus = endpoint->bus.mipi_csi2; + + clk_prepare_enable(refclk); + + state->pdata.refclk_hz = clk_get_rate(refclk); + state->pdata.ddc5v_delay = DDC5V_DELAY_100_MS; + state->pdata.enable_hdcp = false; + /* A FIFO level of 16 should be enough for 2-lane 720p60 at 594 MHz. */ + state->pdata.fifo_level = 16; + /* + * The PLL input clock is obtained by dividing refclk by pll_prd. + * It must be between 6 MHz and 40 MHz, lower frequency is better. + */ + switch (state->pdata.refclk_hz) { + case 26000000: + case 27000000: + case 42000000: + state->pdata.pll_prd = state->pdata.refclk_hz / 6000000; + break; + default: + dev_err(dev, "unsupported refclk rate: %u Hz\n", + state->pdata.refclk_hz); + goto disable_clk; + } + + /* + * The CSI bps per lane must be between 62.5 Mbps and 1 Gbps. + * The default is 594 Mbps for 4-lane 1080p60 or 2-lane 720p60. + */ + bps_pr_lane = 2 * endpoint->link_frequencies[0]; + if (bps_pr_lane < 62500000U || bps_pr_lane > 1000000000U) { + dev_err(dev, "unsupported bps per lane: %u bps\n", bps_pr_lane); + goto disable_clk; + } + + /* The CSI speed per lane is refclk / pll_prd * pll_fbd */ + state->pdata.pll_fbd = bps_pr_lane / + state->pdata.refclk_hz * state->pdata.pll_prd; + + /* + * FIXME: These timings are from REF_02 for 594 Mbps per lane (297 MHz + * link frequency). In principle it should be possible to calculate + * them based on link frequency and resolution. + */ + if (bps_pr_lane != 594000000U) + dev_warn(dev, "untested bps per lane: %u bps\n", bps_pr_lane); + state->pdata.lineinitcnt = 0xe80; + state->pdata.lptxtimecnt = 0x003; + /* tclk-preparecnt: 3, tclk-zerocnt: 20 */ + state->pdata.tclk_headercnt = 0x1403; + state->pdata.tclk_trailcnt = 0x00; + /* ths-preparecnt: 3, ths-zerocnt: 1 */ + state->pdata.ths_headercnt = 0x0103; + state->pdata.twakeup = 0x4882; + state->pdata.tclk_postcnt = 0x008; + state->pdata.ths_trailcnt = 0x2; + state->pdata.hstxvregcnt = 0; + + state->reset_gpio = devm_gpiod_get(dev, "reset"); + if (IS_ERR(state->reset_gpio)) { + dev_err(dev, "failed to get reset gpio\n"); + ret = PTR_ERR(state->reset_gpio); + goto disable_clk; + } + + tc358743_gpio_reset(state); + + ret = 0; + goto free_endpoint; + +disable_clk: + clk_disable_unprepare(refclk); +free_endpoint: + v4l2_of_free_endpoint(endpoint); + return ret; +} +#else +static inline int tc358743_probe_of(struct tc358743_state *state) +{ + return -ENODEV; +} +#endif + static int tc358743_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -1658,14 +1795,20 @@ static int tc358743_probe(struct i2c_client *client, if (!state) return -ENOMEM; + state->i2c_client = client; + /* platform data */ - if (!pdata) { - v4l_err(client, "No platform data!\n"); - return -ENODEV; + if (pdata) { + state->pdata = *pdata; + state->bus.flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK; + } else { + err = tc358743_probe_of(state); + if (err == -ENODEV) + v4l_err(client, "No platform data!\n"); + if (err) + return err; } - state->pdata = *pdata; - state->i2c_client = client; sd = &state->sd; v4l2_i2c_subdev_init(sd, client, &tc358743_ops); sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS; -- 2.20.1