Message-ID: <20220128081101.27837-1-yong.wu@mediatek.com>
Date:   Fri, 28 Jan 2022 16:11:01 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     <dri-devel@...ts.freedesktop.org>
CC:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        "James Wang" <james.qian.wang@....com>,
        Liviu Dudau <liviu.dudau@....com>,
        <iommu@...ts.linux-foundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        <linux-kernel@...r.kernel.org>, "Joerg Roedel" <joro@...tes.org>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        <linux-mediatek@...ts.infradead.org>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        "Stephen Boyd" <sboyd@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        Tomasz Figa <tfiga@...omium.org>,
        <srv_heupstream@...iatek.com>, Rob Clark <robdclark@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        Yong Wu <yong.wu@...iatek.com>
Subject: [RFC PATCH] component: Add common helpers for compare/release functions

The component requires the compare/release functions, there are so many
copy in current kernel. Just define three common helpers for them.
No functional change.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
Base on v5.17-rc1
---
 .../gpu/drm/arm/display/komeda/komeda_drv.c    |  5 -----
 drivers/gpu/drm/arm/hdlcd_drv.c                |  7 +------
 drivers/gpu/drm/armada/armada_drv.c            |  5 -----
 drivers/gpu/drm/drm_of.c                       |  8 +-------
 drivers/gpu/drm/etnaviv/etnaviv_drv.c          |  7 -------
 drivers/gpu/drm/exynos/exynos_drm_drv.c        |  5 -----
 .../gpu/drm/hisilicon/kirin/kirin_drm_drv.c    |  5 -----
 drivers/gpu/drm/imx/imx-drm-core.c             |  4 ++--
 drivers/gpu/drm/ingenic/ingenic-drm-drv.c      |  5 -----
 drivers/gpu/drm/mcde/mcde_drv.c                |  7 +------
 drivers/gpu/drm/mediatek/mtk_drm_drv.c         |  5 -----
 drivers/gpu/drm/meson/meson_drv.c              |  8 --------
 drivers/gpu/drm/msm/msm_drv.c                  |  9 ---------
 drivers/gpu/drm/omapdrm/dss/dss.c              |  8 +-------
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c    |  5 -----
 drivers/gpu/drm/sti/sti_drv.c                  |  5 -----
 drivers/gpu/drm/sun4i/sun4i_drv.c              |  9 ---------
 drivers/gpu/drm/vc4/vc4_drv.c                  |  5 -----
 drivers/iommu/mtk_iommu.h                      | 10 ----------
 drivers/power/supply/ab8500_charger.c          |  8 +-------
 drivers/video/fbdev/omap2/omapfb/dss/dss.c     |  8 +-------
 include/linux/component.h                      | 18 ++++++++++++++++++
 sound/soc/codecs/wcd938x.c                     | 16 ++--------------
 23 files changed, 28 insertions(+), 144 deletions(-)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
index e7933930a657..fe5b97107417 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
@@ -92,11 +92,6 @@ static const struct component_master_ops komeda_master_ops = {
 	.unbind	= komeda_unbind,
 };
 
-static int compare_of(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
 static void komeda_add_slave(struct device *master,
 			     struct component_match **match,
 			     struct device_node *np,
diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
index 479c2422a2e0..36d84c439df8 100644
--- a/drivers/gpu/drm/arm/hdlcd_drv.c
+++ b/drivers/gpu/drm/arm/hdlcd_drv.c
@@ -372,11 +372,6 @@ static const struct component_master_ops hdlcd_master_ops = {
 	.unbind		= hdlcd_drm_unbind,
 };
 
-static int compare_dev(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
 static int hdlcd_probe(struct platform_device *pdev)
 {
 	struct device_node *port;
@@ -387,7 +382,7 @@ static int hdlcd_probe(struct platform_device *pdev)
 	if (!port)
 		return -ENODEV;
 
-	drm_of_component_match_add(&pdev->dev, &match, compare_dev, port);
+	drm_of_component_match_add(&pdev->dev, &match, compare_of, port);
 	of_node_put(port);
 
 	return component_master_add_with_match(&pdev->dev, &hdlcd_master_ops,
diff --git a/drivers/gpu/drm/armada/armada_drv.c b/drivers/gpu/drm/armada/armada_drv.c
index 8e3e98f13db4..9edc4912c1a0 100644
--- a/drivers/gpu/drm/armada/armada_drv.c
+++ b/drivers/gpu/drm/armada/armada_drv.c
@@ -177,11 +177,6 @@ static void armada_drm_unbind(struct device *dev)
 	drm_mm_takedown(&priv->linear);
 }
 
-static int compare_of(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
 static int compare_dev_name(struct device *dev, void *data)
 {
 	const char *name = data;
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 59d368ea006b..f958f48f8ba4 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -18,11 +18,6 @@
  * properties.
  */
 
-static void drm_release_of(struct device *dev, void *data)
-{
-	of_node_put(data);
-}
-
 /**
  * drm_of_crtc_port_mask - find the mask of a registered CRTC by port OF node
  * @dev: DRM device
@@ -94,8 +89,7 @@ void drm_of_component_match_add(struct device *master,
 				struct device_node *node)
 {
 	of_node_get(node);
-	component_match_add_release(master, matchptr, drm_release_of,
-				    compare, node);
+	component_match_add_release(master, matchptr, release_of, compare, node);
 }
 EXPORT_SYMBOL_GPL(drm_of_component_match_add);
 
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
index 0b756ecb1bc2..15351e26ab00 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -574,13 +574,6 @@ static const struct component_master_ops etnaviv_master_ops = {
 	.unbind = etnaviv_unbind,
 };
 
-static int compare_of(struct device *dev, void *data)
-{
-	struct device_node *np = data;
-
-	return dev->of_node == np;
-}
-
 static int compare_str(struct device *dev, void *data)
 {
 	return !strcmp(dev_name(dev), data);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 9743b6b17447..97f6bc69bee3 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -212,11 +212,6 @@ static struct exynos_drm_driver_info exynos_drm_drivers[] = {
 	}
 };
 
-static int compare_dev(struct device *dev, void *data)
-{
-	return dev == (struct device *)data;
-}
-
 static struct component_match *exynos_drm_match_add(struct device *dev)
 {
 	struct component_match *match = NULL;
diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
index 98ae9a48f3fe..8cc6e13e46af 100644
--- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
@@ -203,11 +203,6 @@ static int kirin_drm_kms_init(struct drm_device *dev,
 	return ret;
 }
 
-static int compare_of(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
 static int kirin_drm_kms_cleanup(struct drm_device *dev)
 {
 	drm_kms_helper_poll_fini(dev);
diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
index cb685fe2039b..11b5c0fae045 100644
--- a/drivers/gpu/drm/imx/imx-drm-core.c
+++ b/drivers/gpu/drm/imx/imx-drm-core.c
@@ -176,7 +176,7 @@ static const struct drm_driver imx_drm_driver = {
 	.patchlevel		= 0,
 };
 
-static int compare_of(struct device *dev, void *data)
+static int imx_compare_of(struct device *dev, void *data)
 {
 	struct device_node *np = data;
 
@@ -286,7 +286,7 @@ static const struct component_master_ops imx_drm_ops = {
 
 static int imx_drm_platform_probe(struct platform_device *pdev)
 {
-	int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
+	int ret = drm_of_component_probe(&pdev->dev, imx_compare_of, &imx_drm_ops);
 
 	if (!ret)
 		ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index b4943a56be09..194abab14ffe 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -1322,11 +1322,6 @@ static int ingenic_drm_bind_with_components(struct device *dev)
 	return ingenic_drm_bind(dev, true);
 }
 
-static int compare_of(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
 static void ingenic_drm_unbind(struct device *dev)
 {
 	struct ingenic_drm *priv = dev_get_drvdata(dev);
diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c
index 5b5afc6aaf8e..015690b6d308 100644
--- a/drivers/gpu/drm/mcde/mcde_drv.c
+++ b/drivers/gpu/drm/mcde/mcde_drv.c
@@ -265,11 +265,6 @@ static struct platform_driver *const mcde_component_drivers[] = {
 	&mcde_dsi_driver,
 };
 
-static int mcde_compare_dev(struct device *dev, void *data)
-{
-	return dev == data;
-}
-
 static int mcde_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -399,7 +394,7 @@ static int mcde_probe(struct platform_device *pdev)
 
 		while ((d = platform_find_device_by_driver(p, drv))) {
 			put_device(p);
-			component_match_add(dev, &match, mcde_compare_dev, d);
+			component_match_add(dev, &match, compare_dev, d);
 			p = d;
 		}
 		put_device(p);
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 56ff8c57ef8f..72586983ec1d 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -369,11 +369,6 @@ static const struct drm_driver mtk_drm_driver = {
 	.minor = DRIVER_MINOR,
 };
 
-static int compare_of(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
 static int mtk_drm_bind(struct device *dev)
 {
 	struct mtk_drm_private *private = dev_get_drvdata(dev);
diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 80f1d439841a..b68631d16eb3 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -423,14 +423,6 @@ static int __maybe_unused meson_drv_pm_resume(struct device *dev)
 	return drm_mode_config_helper_resume(priv->drm);
 }
 
-static int compare_of(struct device *dev, void *data)
-{
-	DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
-			 dev->of_node, data);
-
-	return dev->of_node == data;
-}
-
 static void meson_drv_shutdown(struct platform_device *pdev)
 {
 	struct meson_drm *priv = dev_get_drvdata(&pdev->dev);
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index ad35a5d94053..6250327b1eda 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -1173,15 +1173,6 @@ static const struct dev_pm_ops msm_pm_ops = {
  * Componentized driver support:
  */
 
-/*
- * NOTE: duplication of the same code as exynos or imx (or probably any other).
- * so probably some room for some helpers
- */
-static int compare_of(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
 /*
  * Identify what components need to be added by parsing what remote-endpoints
  * our MDP output ports are connected to. In the case of LVDS on MDP4, there
diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c
index 69b3e15b9356..5216000c7657 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss.c
+++ b/drivers/gpu/drm/omapdrm/dss/dss.c
@@ -1344,12 +1344,6 @@ static const struct component_master_ops dss_component_ops = {
 	.unbind = dss_unbind,
 };
 
-static int dss_component_compare(struct device *dev, void *data)
-{
-	struct device *child = data;
-	return dev == child;
-}
-
 struct dss_component_match_data {
 	struct device *dev;
 	struct component_match **match;
@@ -1379,7 +1373,7 @@ static int dss_add_child_component(struct device *dev, void *data)
 		return device_for_each_child(dev, cmatch,
 					     dss_add_child_component);
 
-	component_match_add(cmatch->dev, match, dss_component_compare, dev);
+	component_match_add(cmatch->dev, match, compare_dev, dev);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index bec207de4544..276e41168bd0 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -290,11 +290,6 @@ int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
 	return false;
 }
 
-static int compare_dev(struct device *dev, void *data)
-{
-	return dev == (struct device *)data;
-}
-
 static void rockchip_drm_match_remove(struct device *dev)
 {
 	struct device_link *link;
diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c
index c7efb43b83ee..3c3294c2100d 100644
--- a/drivers/gpu/drm/sti/sti_drv.c
+++ b/drivers/gpu/drm/sti/sti_drv.c
@@ -144,11 +144,6 @@ static const struct drm_driver sti_driver = {
 	.minor = DRIVER_MINOR,
 };
 
-static int compare_of(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
 static int sti_init(struct drm_device *ddev)
 {
 	struct sti_private *private;
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index b630614b3d72..de26c1448486 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -201,15 +201,6 @@ static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
 		!!of_match_node(sun8i_tcon_top_of_table, node);
 }
 
-static int compare_of(struct device *dev, void *data)
-{
-	DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
-			 dev->of_node,
-			 data);
-
-	return dev->of_node == data;
-}
-
 /*
  * The encoder drivers use drm_of_find_possible_crtcs to get upstream
  * crtcs from the device tree using of_graph. For the results to be
diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 16abc3a3d601..43474107a4f2 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -187,11 +187,6 @@ static struct drm_driver vc4_drm_driver = {
 	.patchlevel = DRIVER_PATCHLEVEL,
 };
 
-static int compare_dev(struct device *dev, void *data)
-{
-	return dev == data;
-}
-
 static void vc4_match_add_drivers(struct device *dev,
 				  struct component_match **match,
 				  struct platform_driver *const *drivers,
diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index f81fa8862ed0..b742432220c5 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -84,16 +84,6 @@ struct mtk_iommu_data {
 	struct mtk_smi_larb_iommu	larb_imu[MTK_LARB_NR_MAX];
 };
 
-static inline int compare_of(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
-static inline void release_of(struct device *dev, void *data)
-{
-	of_node_put(data);
-}
-
 static inline int mtk_iommu_bind(struct device *dev)
 {
 	struct mtk_iommu_data *data = dev_get_drvdata(dev);
diff --git a/drivers/power/supply/ab8500_charger.c b/drivers/power/supply/ab8500_charger.c
index ce074c018dcb..248dfd8aec19 100644
--- a/drivers/power/supply/ab8500_charger.c
+++ b/drivers/power/supply/ab8500_charger.c
@@ -3414,11 +3414,6 @@ static struct platform_driver *const ab8500_charger_component_drivers[] = {
 	&ab8500_chargalg_driver,
 };
 
-static int ab8500_charger_compare_dev(struct device *dev, void *data)
-{
-	return dev == data;
-}
-
 static int ab8500_charger_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -3657,8 +3652,7 @@ static int ab8500_charger_probe(struct platform_device *pdev)
 
 		while ((d = platform_find_device_by_driver(p, drv))) {
 			put_device(p);
-			component_match_add(dev, &match,
-					    ab8500_charger_compare_dev, d);
+			component_match_add(dev, &match, compare_dev, d);
 			p = d;
 		}
 		put_device(p);
diff --git a/drivers/video/fbdev/omap2/omapfb/dss/dss.c b/drivers/video/fbdev/omap2/omapfb/dss/dss.c
index a6b1c1598040..328aa5d86f1a 100644
--- a/drivers/video/fbdev/omap2/omapfb/dss/dss.c
+++ b/drivers/video/fbdev/omap2/omapfb/dss/dss.c
@@ -1193,12 +1193,6 @@ static const struct component_master_ops dss_component_ops = {
 	.unbind = dss_unbind,
 };
 
-static int dss_component_compare(struct device *dev, void *data)
-{
-	struct device *child = data;
-	return dev == child;
-}
-
 static int dss_add_child_component(struct device *dev, void *data)
 {
 	struct component_match **match = data;
@@ -1212,7 +1206,7 @@ static int dss_add_child_component(struct device *dev, void *data)
 	if (strstr(dev_name(dev), "rfbi"))
 		return 0;
 
-	component_match_add(dev->parent, match, dss_component_compare, dev);
+	component_match_add(dev->parent, match, compare_dev, dev);
 
 	return 0;
 }
diff --git a/include/linux/component.h b/include/linux/component.h
index 16de18f473d7..5a7468ea827c 100644
--- a/include/linux/component.h
+++ b/include/linux/component.h
@@ -2,6 +2,8 @@
 #ifndef COMPONENT_H
 #define COMPONENT_H
 
+#include <linux/device.h>
+#include <linux/of.h>
 #include <linux/stddef.h>
 
 
@@ -82,6 +84,22 @@ struct component_master_ops {
 	void (*unbind)(struct device *master);
 };
 
+/* A set common helpers for compare/release functions */
+static inline int compare_of(struct device *dev, void *data)
+{
+	return dev->of_node == data;
+}
+
+static inline void release_of(struct device *dev, void *data)
+{
+	of_node_put(data);
+}
+
+static inline int compare_dev(struct device *dev, void *data)
+{
+	return dev == data;
+}
+
 void component_master_del(struct device *,
 	const struct component_master_ops *);
 
diff --git a/sound/soc/codecs/wcd938x.c b/sound/soc/codecs/wcd938x.c
index eff200a07d9f..992132cbfb9f 100644
--- a/sound/soc/codecs/wcd938x.c
+++ b/sound/soc/codecs/wcd938x.c
@@ -4417,16 +4417,6 @@ static const struct component_master_ops wcd938x_comp_ops = {
 	.unbind = wcd938x_unbind,
 };
 
-static int wcd938x_compare_of(struct device *dev, void *data)
-{
-	return dev->of_node == data;
-}
-
-static void wcd938x_release_of(struct device *dev, void *data)
-{
-	of_node_put(data);
-}
-
 static int wcd938x_add_slave_components(struct wcd938x_priv *wcd938x,
 					struct device *dev,
 					struct component_match **matchptr)
@@ -4442,8 +4432,7 @@ static int wcd938x_add_slave_components(struct wcd938x_priv *wcd938x,
 	}
 
 	of_node_get(wcd938x->rxnode);
-	component_match_add_release(dev, matchptr, wcd938x_release_of,
-				    wcd938x_compare_of,	wcd938x->rxnode);
+	component_match_add_release(dev, matchptr, release_of, compare_of, wcd938x->rxnode);
 
 	wcd938x->txnode = of_parse_phandle(np, "qcom,tx-device", 0);
 	if (!wcd938x->txnode) {
@@ -4451,8 +4440,7 @@ static int wcd938x_add_slave_components(struct wcd938x_priv *wcd938x,
 		return -ENODEV;
 	}
 	of_node_get(wcd938x->txnode);
-	component_match_add_release(dev, matchptr, wcd938x_release_of,
-				    wcd938x_compare_of,	wcd938x->txnode);
+	component_match_add_release(dev, matchptr, release_of, compare_of, wcd938x->txnode);
 	return 0;
 }
 
-- 
2.18.0

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