OMAP2, 3: DSS2: DSS: create platform_driver, move init, exit to driver

Hwmod adaptation design requires each of the DSS HW IP to be a platform driver.
So a platform_driver of DSS is created and init exit methods are moved from core.c
to its driver probe,remove. pdev member has to be maintained by its own drivers.

DSS platform driver is registered from inside omap_dss_probe, in the order desired.
Signed-off-by: Senthilvadivu Guruswamy <svadivu@ti.com>
Signed-off-by: Sumit Semwal <sumit.semwal@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/core.c

@@ -517,15 +517,9 @@ static int omap_dss_probe(struct platform_device *pdev)
 	core.ctx_id = dss_get_ctx_id();
 	DSSDBG("initial ctx id %u\n", core.ctx_id);
 
-#ifdef CONFIG_FB_OMAP_BOOTLOADER_INIT
-	/* DISPC_CONTROL */
-	if (omap_readl(0x48050440) & 1)	/* LCD enabled? */
-		skip_init = 1;
-#endif
-
-	r = dss_init(skip_init);
+	r = dss_init_platform_driver();
 	if (r) {
-		DSSERR("Failed to initialize DSS\n");
+		DSSERR("Failed to initialize DSS platform driver\n");
 		goto err_dss;
 	}
 
@@ -553,6 +547,11 @@ static int omap_dss_probe(struct platform_device *pdev)
 		goto err_venc;
 	}
 
+#ifdef CONFIG_FB_OMAP_BOOTLOADER_INIT
+	/* DISPC_CONTROL */
+	if (omap_readl(0x48050440) & 1)	/* LCD enabled? */
+		skip_init = 1;
+#endif
 	if (cpu_is_omap34xx()) {
 		r = sdi_init(skip_init);
 		if (r) {
@@ -610,7 +609,7 @@ static int omap_dss_probe(struct platform_device *pdev)
 err_dpi:
 	rfbi_exit();
 err_rfbi:
-	dss_exit();
+	dss_uninit_platform_driver();
 err_dss:
 	dss_clk_disable_all_no_ctx();
 	dss_put_clocks();
@@ -635,7 +634,7 @@ static int omap_dss_remove(struct platform_device *pdev)
 		sdi_exit();
 	}
 
-	dss_exit();
+	dss_uninit_platform_driver();
 
 	/*
 	 * As part of hwmod changes, DSS is not the only controller of dss

drivers/video/omap2/dss/dss.c

@@ -59,6 +59,7 @@ struct dss_reg {
 	dss_write_reg(idx, FLD_MOD(dss_read_reg(idx), val, start, end))
 
 static struct {
+	struct platform_device *pdev;
 	void __iomem    *base;
 
 	struct clk	*dpll4_m4_ck;
@@ -549,7 +550,7 @@ void dss_set_dac_pwrdn_bgz(bool enable)
 	REG_FLD_MOD(DSS_CONTROL, enable, 5, 5);	/* DAC Power-Down Control */
 }
 
-int dss_init(bool skip_init)
+static int dss_init(bool skip_init)
 {
 	int r;
 	u32 rev;
@@ -629,7 +630,7 @@ int dss_init(bool skip_init)
 	return r;
 }
 
-void dss_exit(void)
+static void dss_exit(void)
 {
 	if (cpu_is_omap34xx())
 		clk_put(dss.dpll4_m4_ck);
@@ -639,3 +640,53 @@ void dss_exit(void)
 	iounmap(dss.base);
 }
 
+/* DSS HW IP initialisation */
+static int omap_dsshw_probe(struct platform_device *pdev)
+{
+	int r;
+	int skip_init = 0;
+
+	dss.pdev = pdev;
+
+#ifdef CONFIG_FB_OMAP_BOOTLOADER_INIT
+	/* DISPC_CONTROL */
+	if (omap_readl(0x48050440) & 1)	/* LCD enabled? */
+		skip_init = 1;
+#endif
+
+	r = dss_init(skip_init);
+	if (r) {
+		DSSERR("Failed to initialize DSS\n");
+		goto err_dss;
+	}
+
+err_dss:
+
+	return r;
+}
+
+static int omap_dsshw_remove(struct platform_device *pdev)
+{
+	dss_exit();
+
+	return 0;
+}
+
+static struct platform_driver omap_dsshw_driver = {
+	.probe          = omap_dsshw_probe,
+	.remove         = omap_dsshw_remove,
+	.driver         = {
+		.name   = "omapdss_dss",
+		.owner  = THIS_MODULE,
+	},
+};
+
+int dss_init_platform_driver(void)
+{
+	return platform_driver_register(&omap_dsshw_driver);
+}
+
+void dss_uninit_platform_driver(void)
+{
+	return platform_driver_unregister(&omap_dsshw_driver);
+}

drivers/video/omap2/dss/dss.h

@@ -214,8 +214,8 @@ void dss_overlay_setup_l4_manager(struct omap_overlay_manager *mgr);
 void dss_recheck_connections(struct omap_dss_device *dssdev, bool force);
 
 /* DSS */
-int dss_init(bool skip_init);
-void dss_exit(void);
+int dss_init_platform_driver(void);
+void dss_uninit_platform_driver(void);
 
 void dss_save_context(void);
 void dss_restore_context(void);