[media] smiapp-pll: Parallel bus support

Support sensors with parallel interface.
Make smiapp_pll.flags also 8-bit so it fits nicely into two 32-bit words
with the other 8-bit fields.
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/i2c/smiapp-pll.c

@@ -371,7 +371,7 @@ int smiapp_pll_calculate(struct device *dev, struct smiapp_pll_limits *limits,
 	int rval = -EINVAL;
 
 	if (pll->flags & SMIAPP_PLL_FLAG_OP_PIX_CLOCK_PER_LANE)
-		lane_op_clock_ratio = pll->lanes;
+		lane_op_clock_ratio = pll->csi2.lanes;
 	else
 		lane_op_clock_ratio = 1;
 	dev_dbg(dev, "lane_op_clock_ratio: %d\n", lane_op_clock_ratio);
@@ -379,9 +379,20 @@ int smiapp_pll_calculate(struct device *dev, struct smiapp_pll_limits *limits,
 	dev_dbg(dev, "binning: %dx%d\n", pll->binning_horizontal,
 		pll->binning_vertical);
 
+	switch (pll->bus_type) {
+	case SMIAPP_PLL_BUS_TYPE_CSI2:
 		/* CSI transfers 2 bits per clock per lane; thus times 2 */
 		pll->pll_op_clk_freq_hz = pll->link_freq * 2
-		* (pll->lanes / lane_op_clock_ratio);
+			* (pll->csi2.lanes / lane_op_clock_ratio);
+		break;
+	case SMIAPP_PLL_BUS_TYPE_PARALLEL:
+		pll->pll_op_clk_freq_hz = pll->link_freq * pll->bits_per_pixel
+			/ DIV_ROUND_UP(pll->bits_per_pixel,
+				       pll->parallel.bus_width);
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	/* Figure out limits for pre-pll divider based on extclk */
 	dev_dbg(dev, "min / max pre_pll_clk_div: %d / %d\n",

drivers/media/i2c/smiapp-pll.h

@@ -27,16 +27,34 @@
 
 #include <linux/device.h>
 
+/* CSI-2 or CCP-2 */
+#define SMIAPP_PLL_BUS_TYPE_CSI2				0x00
+#define SMIAPP_PLL_BUS_TYPE_PARALLEL				0x01
+
+/* op pix clock is for all lanes in total normally */
+#define SMIAPP_PLL_FLAG_OP_PIX_CLOCK_PER_LANE			(1 << 0)
+#define SMIAPP_PLL_FLAG_NO_OP_CLOCKS				(1 << 1)
+
 struct smiapp_pll {
+	/* input values */
+	uint8_t bus_type;
+	union {
+		struct {
 			uint8_t lanes;
+		} csi2;
+		struct {
+			uint8_t bus_width;
+		} parallel;
+	};
+	uint8_t flags;
 	uint8_t binning_horizontal;
 	uint8_t binning_vertical;
 	uint8_t scale_m;
 	uint8_t scale_n;
 	uint8_t bits_per_pixel;
-	uint16_t flags;
 	uint32_t link_freq;
 
+	/* output values */
 	uint16_t pre_pll_clk_div;
 	uint16_t pll_multiplier;
 	uint16_t op_sys_clk_div;
@@ -91,10 +109,6 @@ struct smiapp_pll_limits {
 	uint32_t min_line_length_pck;
 };
 
-/* op pix clock is for all lanes in total normally */
-#define SMIAPP_PLL_FLAG_OP_PIX_CLOCK_PER_LANE			(1 << 0)
-#define SMIAPP_PLL_FLAG_NO_OP_CLOCKS				(1 << 1)
-
 struct device;
 
 int smiapp_pll_calculate(struct device *dev, struct smiapp_pll_limits *limits,

drivers/media/i2c/smiapp/smiapp-core.c

@@ -2625,7 +2625,8 @@ static int smiapp_registered(struct v4l2_subdev *subdev)
 		goto out_nvm_release;
 
 	/* prepare PLL configuration input values */
-	pll->lanes = sensor->platform_data->lanes;
+	pll->bus_type = SMIAPP_PLL_BUS_TYPE_CSI2;
+	pll->csi2.lanes = sensor->platform_data->lanes;
 	pll->ext_clk_freq_hz = sensor->platform_data->ext_clk;
 	/* Profile 0 sensors have no separate OP clock branch. */
 	if (sensor->minfo.smiapp_profile == SMIAPP_PROFILE_0)