[media] exynos-gsc: Add support for Exynos5433 specific version

This patch adds support for Exynos5433 specific version of the GScaler
module. The main difference between Exynos 5433 and earlier is addition
of new clocks that have to be controlled.

Signed-off-by: Marek Szyprowski <[e-mail]>
Reviewed-by: Javier Martinez Canillas <[e-mail]>
Tested-by: Javier Martinez Canillas <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Sylwester Nawrocki <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/devicetree/bindings/media/exynos5-gsc.txt

···
 G-Scaler is used for scaling and color space conversion on EXYNOS5 SoCs.
 
 Required properties:
-- compatible: should be "samsung,exynos5-gsc"
+- compatible: should be "samsung,exynos5-gsc" (for Exynos 5250, 5420 and
+	      5422 SoCs) or "samsung,exynos5433-gsc" (Exynos 5433)
 - reg: should contain G-Scaler physical address location and length.
 - interrupts: should contain G-Scaler interrupt number
 

drivers/media/platform/exynos-gsc/gsc-core.c

···
 
 #include "gsc-core.h"
 
-#define GSC_CLOCK_GATE_NAME	"gscl"
-
 static const struct gsc_fmt gsc_formats[] = {
 	{
 		.name		= "RGB565",
···
 		[3] = &gsc_v_100_variant,
 	},
 	.num_entities = 4,
+	.clk_names = { "gscl" },
+	.num_clocks = 1,
+};
+
+static struct gsc_driverdata gsc_5433_drvdata = {
+	.variant = {
+		[0] = &gsc_v_100_variant,
+		[1] = &gsc_v_100_variant,
+		[2] = &gsc_v_100_variant,
+	},
+	.num_entities = 3,
+	.clk_names = { "pclk", "aclk", "aclk_xiu", "aclk_gsclbend" },
+	.num_clocks = 4,
 };
 
 static const struct of_device_id exynos_gsc_match[] = {
 	{
 		.compatible = "samsung,exynos5-gsc",
 		.data = &gsc_v_100_drvdata,
+	},
+	{
+		.compatible = "samsung,exynos5433-gsc",
+		.data = &gsc_5433_drvdata,
 	},
 	{},
 };
···
 	struct device *dev = &pdev->dev;
 	const struct gsc_driverdata *drv_data = of_device_get_match_data(dev);
 	int ret;
+	int i;
 
 	gsc = devm_kzalloc(dev, sizeof(struct gsc_dev), GFP_KERNEL);
 	if (!gsc)
···
 		return -EINVAL;
 	}
 
+	gsc->num_clocks = drv_data->num_clocks;
 	gsc->variant = drv_data->variant[gsc->id];
 	gsc->pdev = pdev;
 
···
 		return -ENXIO;
 	}
 
-	gsc->clock = devm_clk_get(dev, GSC_CLOCK_GATE_NAME);
-	if (IS_ERR(gsc->clock)) {
-		dev_err(dev, "failed to get clock~~~: %s\n",
-			GSC_CLOCK_GATE_NAME);
-		return PTR_ERR(gsc->clock);
+	for (i = 0; i < gsc->num_clocks; i++) {
+		gsc->clock[i] = devm_clk_get(dev, drv_data->clk_names[i]);
+		if (IS_ERR(gsc->clock[i])) {
+			dev_err(dev, "failed to get clock: %s\n",
+				drv_data->clk_names[i]);
+			return PTR_ERR(gsc->clock[i]);
+		}
 	}
 
-	ret = clk_prepare_enable(gsc->clock);
-	if (ret) {
-		dev_err(&gsc->pdev->dev, "clock prepare failed for clock: %s\n",
-			GSC_CLOCK_GATE_NAME);
-		return ret;
+	for (i = 0; i < gsc->num_clocks; i++) {
+		ret = clk_prepare_enable(gsc->clock[i]);
+		if (ret) {
+			dev_err(dev, "clock prepare failed for clock: %s\n",
+				drv_data->clk_names[i]);
+			while (--i >= 0)
+				clk_disable_unprepare(gsc->clock[i]);
+			return ret;
+		}
 	}
 
 	ret = devm_request_irq(dev, res->start, gsc_irq_handler,
···
 err_v4l2:
 	v4l2_device_unregister(&gsc->v4l2_dev);
 err_clk:
-	clk_disable_unprepare(gsc->clock);
+	for (i = gsc->num_clocks - 1; i >= 0; i--)
+		clk_disable_unprepare(gsc->clock[i]);
 	return ret;
 }
 
 static int gsc_remove(struct platform_device *pdev)
 {
 	struct gsc_dev *gsc = platform_get_drvdata(pdev);
+	int i;
 
 	pm_runtime_get_sync(&pdev->dev);
 
···
 	v4l2_device_unregister(&gsc->v4l2_dev);
 
 	vb2_dma_contig_clear_max_seg_size(&pdev->dev);
-	clk_disable_unprepare(gsc->clock);
+	for (i = 0; i < gsc->num_clocks; i++)
+		clk_disable_unprepare(gsc->clock[i]);
 
 	pm_runtime_put_noidle(&pdev->dev);
 
···
 {
 	struct gsc_dev *gsc = dev_get_drvdata(dev);
 	int ret = 0;
+	int i;
 
 	pr_debug("gsc%d: state: 0x%lx\n", gsc->id, gsc->state);
 
-	ret = clk_prepare_enable(gsc->clock);
-	if (ret)
-		return ret;
+	for (i = 0; i < gsc->num_clocks; i++) {
+		ret = clk_prepare_enable(gsc->clock[i]);
+		if (ret) {
+			while (--i >= 0)
+				clk_disable_unprepare(gsc->clock[i]);
+			return ret;
+		}
+	}
 
 	gsc_hw_set_sw_reset(gsc);
 	gsc_wait_reset(gsc);
···
 {
 	struct gsc_dev *gsc = dev_get_drvdata(dev);
 	int ret = 0;
+	int i;
 
 	ret = gsc_m2m_suspend(gsc);
-	if (!ret)
-		clk_disable_unprepare(gsc->clock);
+	if (ret)
+		return ret;
+
+	for (i = gsc->num_clocks - 1; i >= 0; i--)
+		clk_disable_unprepare(gsc->clock[i]);
 
 	pr_debug("gsc%d: state: 0x%lx\n", gsc->id, gsc->state);
 	return ret;

drivers/media/platform/exynos-gsc/gsc-core.h

···
 
 #define GSC_SHUTDOWN_TIMEOUT		((100*HZ)/1000)
 #define GSC_MAX_DEVS			4
+#define GSC_MAX_CLOCKS			4
 #define GSC_M2M_BUF_NUM			0
 #define GSC_MAX_CTRL_NUM		10
 #define GSC_SC_ALIGN_4			4
···
  */
 struct gsc_driverdata {
 	struct gsc_variant *variant[GSC_MAX_DEVS];
+	const char	*clk_names[GSC_MAX_CLOCKS];
+	int		num_clocks;
 	int		num_entities;
 };
 
···
 	struct platform_device		*pdev;
 	struct gsc_variant		*variant;
 	u16				id;
-	struct clk			*clock;
+	int				num_clocks;
+	struct clk			*clock[GSC_MAX_CLOCKS];
 	void __iomem			*regs;
 	wait_queue_head_t		irq_queue;
 	struct gsc_m2m_device		m2m;