On 07/10/2015 03:11 PM, Philipp Zabel wrote:
> 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 <p.zabel@xxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/media/i2c/tc358743.txt | 48 +++++++
> drivers/media/i2c/tc358743.c | 153 ++++++++++++++++++++-
> 2 files changed, 195 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 0000000..5218921
> --- /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 0be6d9f..02c60b3 100644
> --- a/drivers/media/i2c/tc358743.c
> +++ b/drivers/media/i2c/tc358743.c
> @@ -29,7 +29,9 @@
> #include <linux/module.h>
> #include <linux/slab.h>
> #include <linux/i2c.h>
> +#include <linux/clk.h>
> #include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> #include <linux/videodev2.h>
> #include <linux/workqueue.h>
> #include <linux/v4l2-dv-timings.h>
> @@ -37,6 +39,7 @@
> #include <media/v4l2-dv-timings.h>
> #include <media/v4l2-device.h>
> #include <media/v4l2-ctrls.h>
> +#include <media/v4l2-of.h>
> #include <media/tc358743.h>
>
> #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;
Where is this bus struct set?
> 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);
It's used here.
BTW, since I don't see state->bus being set, that means bus.flags == 0 and
so this register is now set to 0 instead of MASK_CONTCLKMODE.
When using platform data I guess bus.flags should be set to
V4L2_MBUS_CSI2_CONTINUOUS_CLOCK to prevent breakage.
> i2c_wr32(sd, STARTCNTRL, MASK_START);
> i2c_wr32(sd, CSI_START, MASK_STRT);
>
> @@ -1638,6 +1645,135 @@ static const struct v4l2_ctrl_config tc358743_ctrl_audio_present = {
>
> /* --------------- PROBE / REMOVE --------------- */
>
> +#if 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 device_node *np = dev->of_node;
> + 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;
> + }
> +
> + 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 +1794,19 @@ 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;
> + } else {
> + err = tc358743_probe_of(state);
> + if (err == -ENODEV)
> + v4l_err(client, "No platform data!\n");
I'd replace this with "No device tree data!" or something like that.
Regards,
Hans
> + 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;
>
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