git.openwrt.org Git - openwrt/staging/xback.git/blob

   1 From 4afc11ae3b786ad8425435b70ab0285fbf951b05 Mon Sep 17 00:00:00 2001
   2 From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   3 Date: Mon, 16 Jan 2023 15:44:45 +0100
   4 Subject: [PATCH] media: i2c: imx290: Factor out DT parsing to separate
   5  function
   6
   7 Upstream commit 6b69c52277ed
   8
   9 Make the probe() function more readable by factoring out the DT parsing
  10 code to a separate function. No functional change intended.
  11
  12 Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  13 Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
  14 Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
  15 Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
  16 ---
  17  drivers/media/i2c/imx290.c | 95 +++++++++++++++++++++-----------------
  18  1 file changed, 52 insertions(+), 43 deletions(-)
  19
  20 --- a/drivers/media/i2c/imx290.c
  21 +++ b/drivers/media/i2c/imx290.c
  22 @@ -1142,111 +1142,124 @@ static s64 imx290_check_link_freqs(const
  23         return 0;
  24  }
  25
  26 -static int imx290_probe(struct i2c_client *client)
  27 +static int imx290_parse_dt(struct imx290 *imx290)
  28  {
  29 -       struct device *dev = &client->dev;
  30 -       struct fwnode_handle *endpoint;
  31         /* Only CSI2 is supported for now: */
  32         struct v4l2_fwnode_endpoint ep = {
  33                 .bus_type = V4L2_MBUS_CSI2_DPHY
  34         };
  35 -       struct imx290 *imx290;
  36 -       u32 xclk_freq;
  37 -       s64 fq;
  38 +       struct fwnode_handle *endpoint;
  39         int ret;
  40 +       s64 fq;
  41
  42 -       imx290 = devm_kzalloc(dev, sizeof(*imx290), GFP_KERNEL);
  43 -       if (!imx290)
  44 -               return -ENOMEM;
  45 -
  46 -       imx290->dev = dev;
  47 -       imx290->regmap = devm_regmap_init_i2c(client, &imx290_regmap_config);
  48 -       if (IS_ERR(imx290->regmap)) {
  49 -               dev_err(dev, "Unable to initialize I2C\n");
  50 -               return -ENODEV;
  51 -       }
  52 -
  53 -       endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
  54 +       endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(imx290->dev), NULL);
  55         if (!endpoint) {
  56 -               dev_err(dev, "Endpoint node not found\n");
  57 +               dev_err(imx290->dev, "Endpoint node not found\n");
  58                 return -EINVAL;
  59         }
  60
  61         ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &ep);
  62         fwnode_handle_put(endpoint);
  63         if (ret == -ENXIO) {
  64 -               dev_err(dev, "Unsupported bus type, should be CSI2\n");
  65 -               goto err_endpoint;
  66 +               dev_err(imx290->dev, "Unsupported bus type, should be CSI2\n");
  67 +               goto done;
  68         } else if (ret) {
  69 -               dev_err(dev, "Parsing endpoint node failed\n");
  70 -               goto err_endpoint;
  71 +               dev_err(imx290->dev, "Parsing endpoint node failed\n");
  72 +               goto done;
  73         }
  74
  75         /* Get number of data lanes */
  76         imx290->nlanes = ep.bus.mipi_csi2.num_data_lanes;
  77         if (imx290->nlanes != 2 && imx290->nlanes != 4) {
  78 -               dev_err(dev, "Invalid data lanes: %d\n", imx290->nlanes);
  79 +               dev_err(imx290->dev, "Invalid data lanes: %d\n", imx290->nlanes);
  80                 ret = -EINVAL;
  81 -               goto err_endpoint;
  82 +               goto done;
  83         }
  84
  85 -       dev_dbg(dev, "Using %u data lanes\n", imx290->nlanes);
  86 +       dev_dbg(imx290->dev, "Using %u data lanes\n", imx290->nlanes);
  87
  88         if (!ep.nr_of_link_frequencies) {
  89 -               dev_err(dev, "link-frequency property not found in DT\n");
  90 +               dev_err(imx290->dev, "link-frequency property not found in DT\n");
  91                 ret = -EINVAL;
  92 -               goto err_endpoint;
  93 +               goto done;
  94         }
  95
  96         /* Check that link frequences for all the modes are in device tree */
  97         fq = imx290_check_link_freqs(imx290, &ep);
  98         if (fq) {
  99 -               dev_err(dev, "Link frequency of %lld is not supported\n", fq);
 100 +               dev_err(imx290->dev, "Link frequency of %lld is not supported\n",
 101 +                       fq);
 102                 ret = -EINVAL;
 103 -               goto err_endpoint;
 104 +               goto done;
 105         }
 106
 107 +       ret = 0;
 108 +
 109 +done:
 110 +       v4l2_fwnode_endpoint_free(&ep);
 111 +       return ret;
 112 +}
 113 +
 114 +static int imx290_probe(struct i2c_client *client)
 115 +{
 116 +       struct device *dev = &client->dev;
 117 +       struct imx290 *imx290;
 118 +       u32 xclk_freq;
 119 +       int ret;
 120 +
 121 +       imx290 = devm_kzalloc(dev, sizeof(*imx290), GFP_KERNEL);
 122 +       if (!imx290)
 123 +               return -ENOMEM;
 124 +
 125 +       imx290->dev = dev;
 126 +       imx290->regmap = devm_regmap_init_i2c(client, &imx290_regmap_config);
 127 +       if (IS_ERR(imx290->regmap)) {
 128 +               dev_err(dev, "Unable to initialize I2C\n");
 129 +               return -ENODEV;
 130 +       }
 131 +
 132 +       ret = imx290_parse_dt(imx290);
 133 +       if (ret)
 134 +               return ret;
 135 +
 136         /* get system clock (xclk) */
 137         imx290->xclk = devm_clk_get(dev, "xclk");
 138         if (IS_ERR(imx290->xclk)) {
 139                 dev_err(dev, "Could not get xclk");
 140 -               ret = PTR_ERR(imx290->xclk);
 141 -               goto err_endpoint;
 142 +               return PTR_ERR(imx290->xclk);
 143         }
 144
 145         ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
 146                                        &xclk_freq);
 147         if (ret) {
 148                 dev_err(dev, "Could not get xclk frequency\n");
 149 -               goto err_endpoint;
 150 +               return ret;
 151         }
 152
 153         /* external clock must be 37.125 MHz */
 154         if (xclk_freq != 37125000) {
 155                 dev_err(dev, "External clock frequency %u is not supported\n",
 156                         xclk_freq);
 157 -               ret = -EINVAL;
 158 -               goto err_endpoint;
 159 +               return -EINVAL;
 160         }
 161
 162         ret = clk_set_rate(imx290->xclk, xclk_freq);
 163         if (ret) {
 164                 dev_err(dev, "Could not set xclk frequency\n");
 165 -               goto err_endpoint;
 166 +               return ret;
 167         }
 168
 169         ret = imx290_get_regulators(dev, imx290);
 170         if (ret < 0) {
 171                 dev_err(dev, "Cannot get regulators\n");
 172 -               goto err_endpoint;
 173 +               return ret;
 174         }
 175
 176         imx290->rst_gpio = devm_gpiod_get_optional(dev, "reset",
 177                                                    GPIOD_OUT_HIGH);
 178         if (IS_ERR(imx290->rst_gpio)) {
 179                 dev_err(dev, "Cannot get reset gpio\n");
 180 -               ret = PTR_ERR(imx290->rst_gpio);
 181 -               goto err_endpoint;
 182 +               return PTR_ERR(imx290->rst_gpio);
 183         }
 184
 185         mutex_init(&imx290->lock);
 186 @@ -1272,16 +1285,12 @@ static int imx290_probe(struct i2c_clien
 187         pm_runtime_enable(dev);
 188         pm_runtime_idle(dev);
 189
 190 -       v4l2_fwnode_endpoint_free(&ep);
 191 -
 192         return 0;
 193
 194  err_subdev:
 195         imx290_subdev_cleanup(imx290);
 196  err_mutex:
 197         mutex_destroy(&imx290->lock);
 198 -err_endpoint:
 199 -       v4l2_fwnode_endpoint_free(&ep);
 200
 201         return ret;
 202  }