[PATCH v2 04/16] drm/exynos: extract helper functions for probe

[Michael Tretter]

As the driver shall be usable with drivers that use the component
framework and drivers that don't, split the common probing code into a
separate function that can be called from different locations.

Signed-off-by: Michael Tretter <m.tretter at pengutronix.de>
---
v2:
- move pm_runtime_enable from helper to calling function
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 40 ++++++++++++++++++-------
 1 file changed, 30 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index ed04064afbb2..f8e64b74a6dd 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1731,7 +1731,7 @@ static const struct component_ops exynos_dsi_component_ops = {
 	.unbind	= exynos_dsi_unbind,
 };
 
-static int exynos_dsi_probe(struct platform_device *pdev)
+static struct exynos_dsi *__exynos_dsi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct resource *res;
@@ -1740,7 +1740,7 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 
 	dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
 	if (!dsi)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	/* To be checked as invalid one */
 	dsi->te_gpio = -ENOENT;
@@ -1763,14 +1763,14 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 	if (ret) {
 		if (ret != -EPROBE_DEFER)
 			dev_info(dev, "failed to get regulators: %d\n", ret);
-		return ret;
+		return ERR_PTR(ret);
 	}
 
 	dsi->clks = devm_kcalloc(dev,
 			dsi->driver_data->num_clks, sizeof(*dsi->clks),
 			GFP_KERNEL);
 	if (!dsi->clks)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	for (i = 0; i < dsi->driver_data->num_clks; i++) {
 		dsi->clks[i] = devm_clk_get(dev, clk_names[i]);
@@ -1784,7 +1784,7 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 
 			dev_info(dev, "failed to get the clock: %s\n",
 					clk_names[i]);
-			return PTR_ERR(dsi->clks[i]);
+			return ERR_PTR(PTR_ERR(dsi->clks[i]));
 		}
 	}
 
@@ -1792,18 +1792,18 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 	dsi->reg_base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(dsi->reg_base)) {
 		dev_err(dev, "failed to remap io region\n");
-		return PTR_ERR(dsi->reg_base);
+		return dsi->reg_base;
 	}
 
 	dsi->phy = devm_phy_get(dev, "dsim");
 	if (IS_ERR(dsi->phy)) {
 		dev_info(dev, "failed to get dsim phy\n");
-		return PTR_ERR(dsi->phy);
+		return ERR_PTR(PTR_ERR(dsi->phy));
 	}
 
 	dsi->irq = platform_get_irq(pdev, 0);
 	if (dsi->irq < 0)
-		return dsi->irq;
+		return ERR_PTR(dsi->irq);
 
 	irq_set_status_flags(dsi->irq, IRQ_NOAUTOEN);
 	ret = devm_request_threaded_irq(dev, dsi->irq, NULL,
@@ -1811,13 +1811,29 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 					dev_name(dev), dsi);
 	if (ret) {
 		dev_err(dev, "failed to request dsi irq\n");
-		return ret;
+		return ERR_PTR(ret);
 	}
 
 	ret = exynos_dsi_parse_dt(dsi);
 	if (ret)
-		return ret;
+		return ERR_PTR(ret);
+
+	return dsi;
+}
+
+static void __exynos_dsi_remove(struct exynos_dsi *dsi)
+{
+}
 
+static int exynos_dsi_probe(struct platform_device *pdev)
+{
+	struct exynos_dsi *dsi;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	dsi = __exynos_dsi_probe(pdev);
+	if (IS_ERR(dsi))
+		return PTR_ERR(dsi);
 	platform_set_drvdata(pdev, dsi);
 
 	pm_runtime_enable(dev);
@@ -1836,8 +1852,12 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 
 static int exynos_dsi_remove(struct platform_device *pdev)
 {
+	struct exynos_dsi *dsi = platform_get_drvdata(pdev);
+
 	pm_runtime_disable(&pdev->dev);
 
+	__exynos_dsi_remove(dsi);
+
 	component_del(&pdev->dev, &exynos_dsi_component_ops);
 
 	return 0;
-- 
2.20.1