drm/msm/dsi: push provided clocks handling into a generic code

All MSM DSI PHYs provide two clocks: byte and pixel ones.
Register/unregister provided clocks from the generic place, removing
boilerplate code from all MSM DSI PHY drivers.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Tested-by: Stephen Boyd <swboyd@chromium.org> # on sc7180 lazor
Link: https://lore.kernel.org/r/20210331105735.3690009-11-dmitry.baryshkov@linaro.org
Signed-off-by: Rob Clark <robdclark@chromium.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
index 5f153b683521..69214447f757 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
  */
 
+#include <linux/clk-provider.h>
 #include <linux/platform_device.h>
 
 #include "dsi_phy.h"
@@ -652,6 +653,14 @@ static int dsi_phy_driver_probe(struct platform_device *pdev)
 	if (!match)
 		return -ENODEV;
 
+	phy->provided_clocks = devm_kzalloc(dev,
+			struct_size(phy->provided_clocks, hws, NUM_PROVIDED_CLKS),
+			GFP_KERNEL);
+	if (!phy->provided_clocks)
+		return -ENOMEM;
+
+	phy->provided_clocks->num = NUM_PROVIDED_CLKS;
+
 	phy->cfg = match->data;
 	phy->pdev = pdev;
 
@@ -719,6 +728,13 @@ static int dsi_phy_driver_probe(struct platform_device *pdev)
 		}
 	}
 
+	ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
+				     phy->provided_clocks);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "%s: failed to register clk provider: %d\n", __func__, ret);
+		goto fail;
+	}
+
 	dsi_phy_disable_resource(phy);
 
 	platform_set_drvdata(pdev, phy);
@@ -726,6 +742,12 @@ static int dsi_phy_driver_probe(struct platform_device *pdev)
 	return 0;
 
 fail:
+	if (phy->pll) {
+		of_clk_del_provider(dev->of_node);
+		msm_dsi_pll_destroy(phy->pll);
+		phy->pll = NULL;
+	}
+
 	return ret;
 }
 
@@ -734,6 +756,7 @@ static int dsi_phy_driver_remove(struct platform_device *pdev)
 	struct msm_dsi_phy *phy = platform_get_drvdata(pdev);
 
 	if (phy && phy->pll) {
+		of_clk_del_provider(pdev->dev.of_node);
 		msm_dsi_pll_destroy(phy->pll);
 		phy->pll = NULL;
 	}
@@ -851,3 +874,14 @@ void msm_dsi_phy_set_usecase(struct msm_dsi_phy *phy,
 	if (phy)
 		phy->usecase = uc;
 }
+
+int msm_dsi_phy_get_clk_provider(struct msm_dsi_phy *phy,
+	struct clk **byte_clk_provider, struct clk **pixel_clk_provider)
+{
+	if (byte_clk_provider)
+		*byte_clk_provider = phy->provided_clocks->hws[DSI_BYTE_PLL_CLK]->clk;
+	if (pixel_clk_provider)
+		*pixel_clk_provider = phy->provided_clocks->hws[DSI_PIXEL_PLL_CLK]->clk;
+
+	return -EINVAL;
+}