OMAPDSS: Add DT support to DSS

Add DT support for DSS. Contrary to the non-DT version, the DSS in DT
mode contains DPI and SDI outputs, which better reflects the hardware.
The non-DT code will be removed after all boards have been converted to
DT, so there's no need to change the non-DT code to act the same way.

The code for DPI and SDI needs to be refined later to make it possible
to add multiple DPI ports. For now, handling just a single DPI port is
enough for all the boards.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Archit Taneja <archit@ti.com>

4 files changed, 164 insertions, 0 deletions

diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c
index 23ef21ffc2c4..f02520ff6e32 100644
--- a/drivers/video/omap2/dss/dpi.c
+++ b/drivers/video/omap2/dss/dpi.c
@@ -30,6 +30,7 @@
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/string.h>
+#include <linux/of.h>
 
 #include <video/omapdss.h>
 
@@ -49,6 +50,8 @@ static struct {
         int data_lines;
 
         struct omap_dss_device output;
+
+        bool port_initialized;
 } dpi;
 
 static struct platform_device *dpi_get_dsidev(enum omap_channel channel)
@@ -726,3 +729,47 @@ void __exit dpi_uninit_platform_driver(void)
 {
         platform_driver_unregister(&omap_dpi_driver);
 }
+
+int __init dpi_init_port(struct platform_device *pdev, struct device_node *port)
+{
+        struct device_node *ep;
+        u32 datalines;
+        int r;
+
+        ep = omapdss_of_get_next_endpoint(port, NULL);
+        if (!ep)
+                return 0;
+
+        r = of_property_read_u32(ep, "data-lines", &datalines);
+        if (r) {
+                DSSERR("failed to parse datalines\n");
+                goto err_datalines;
+        }
+
+        dpi.data_lines = datalines;
+
+        of_node_put(ep);
+
+        dpi.pdev = pdev;
+
+        mutex_init(&dpi.lock);
+
+        dpi_init_output(pdev);
+
+        dpi.port_initialized = true;
+
+        return 0;
+
+err_datalines:
+        of_node_put(ep);
+
+        return r;
+}
+
+void __exit dpi_uninit_port(void)
+{
+        if (!dpi.port_initialized)
+                return;
+
+        dpi_uninit_output(dpi.pdev);
+}
diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index 9a145da35ad3..1b1c02dfdcf9 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -23,6 +23,7 @@
 #define DSS_SUBSYS_NAME "DSS"
 
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/io.h>
 #include <linux/export.h>
 #include <linux/err.h>
@@ -33,6 +34,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/gfp.h>
 #include <linux/sizes.h>
+#include <linux/of.h>
 
 #include <video/omapdss.h>
 
@@ -788,6 +790,56 @@ static int __init dss_init_features(struct platform_device *pdev)
         return 0;
 }
 
+static int dss_init_ports(struct platform_device *pdev)
+{
+        struct device_node *parent = pdev->dev.of_node;
+        struct device_node *port;
+        int r;
+
+        if (parent == NULL)
+                return 0;
+
+        port = omapdss_of_get_next_port(parent, NULL);
+        if (!port) {
+#ifdef CONFIG_OMAP2_DSS_DPI
+                dpi_init_port(pdev, parent);
+#endif
+                return 0;
+        }
+
+        do {
+                u32 reg;
+
+                r = of_property_read_u32(port, "reg", &reg);
+                if (r)
+                        reg = 0;
+
+#ifdef CONFIG_OMAP2_DSS_DPI
+                if (reg == 0)
+                        dpi_init_port(pdev, port);
+#endif
+
+#ifdef CONFIG_OMAP2_DSS_SDI
+                if (reg == 1)
+                        sdi_init_port(pdev, port);
+#endif
+
+        } while ((port = omapdss_of_get_next_port(parent, port)) != NULL);
+
+        return 0;
+}
+
+static void dss_uninit_ports(void)
+{
+#ifdef CONFIG_OMAP2_DSS_DPI
+        dpi_uninit_port();
+#endif
+
+#ifdef CONFIG_OMAP2_DSS_SDI
+        sdi_uninit_port();
+#endif
+}
+
 /* DSS HW IP initialisation */
 static int __init omap_dsshw_probe(struct platform_device *pdev)
 {
@@ -846,6 +898,8 @@ static int __init omap_dsshw_probe(struct platform_device *pdev)
         dss.lcd_clk_source[0] = OMAP_DSS_CLK_SRC_FCK;
         dss.lcd_clk_source[1] = OMAP_DSS_CLK_SRC_FCK;
 
+        dss_init_ports(pdev);
+
         rev = dss_read_reg(DSS_REVISION);
         printk(KERN_INFO "OMAP DSS rev %d.%d\n",
                         FLD_GET(rev, 7, 4), FLD_GET(rev, 3, 0));
@@ -865,6 +919,8 @@ err_setup_clocks:
 
 static int __exit omap_dsshw_remove(struct platform_device *pdev)
 {
+        dss_uninit_ports();
+
         pm_runtime_disable(&pdev->dev);
 
         dss_put_clocks();
@@ -902,12 +958,22 @@ static const struct dev_pm_ops dss_pm_ops = {
         .runtime_resume = dss_runtime_resume,
 };
 
+static const struct of_device_id dss_of_match[] = {
+        { .compatible = "ti,omap2-dss", },
+        { .compatible = "ti,omap3-dss", },
+        { .compatible = "ti,omap4-dss", },
+        {},
+};
+
+MODULE_DEVICE_TABLE(of, dss_of_match);
+
 static struct platform_driver omap_dsshw_driver = {
         .remove         = __exit_p(omap_dsshw_remove),
         .driver         = {
                 .name   = "omapdss_dss",
                 .owner  = THIS_MODULE,
                 .pm     = &dss_pm_ops,
+                .of_match_table = dss_of_match,
         },
 };
 
diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h
index 057f24c8a332..8ece4f531006 100644
--- a/drivers/video/omap2/dss/dss.h
+++ b/drivers/video/omap2/dss/dss.h
@@ -252,6 +252,9 @@ bool dss_div_calc(unsigned long pck, unsigned long fck_min,
 int sdi_init_platform_driver(void) __init;
 void sdi_uninit_platform_driver(void) __exit;
 
+int sdi_init_port(struct platform_device *pdev, struct device_node *port) __init;
+void sdi_uninit_port(void) __exit;
+
 /* DSI */
 
 typedef bool (*dsi_pll_calc_func)(int regn, int regm, unsigned long fint,
@@ -363,6 +366,9 @@ static inline bool dsi_pll_calc(struct platform_device *dsidev,
 int dpi_init_platform_driver(void) __init;
 void dpi_uninit_platform_driver(void) __exit;
 
+int dpi_init_port(struct platform_device *pdev, struct device_node *port) __init;
+void dpi_uninit_port(void) __exit;
+
 /* DISPC */
 int dispc_init_platform_driver(void) __init;
 void dispc_uninit_platform_driver(void) __exit;
diff --git a/drivers/video/omap2/dss/sdi.c b/drivers/video/omap2/dss/sdi.c
index ba806c9e7f54..d16277ca22a8 100644
--- a/drivers/video/omap2/dss/sdi.c
+++ b/drivers/video/omap2/dss/sdi.c
@@ -26,6 +26,7 @@
 #include <linux/export.h>
 #include <linux/platform_device.h>
 #include <linux/string.h>
+#include <linux/of.h>
 
 #include <video/omapdss.h>
 #include "dss.h"
@@ -41,6 +42,8 @@ static struct {
         int datapairs;
 
         struct omap_dss_device output;
+
+        bool port_initialized;
 } sdi;
 
 struct sdi_clk_calc_ctx {
@@ -387,3 +390,45 @@ void __exit sdi_uninit_platform_driver(void)
 {
         platform_driver_unregister(&omap_sdi_driver);
 }
+
+int __init sdi_init_port(struct platform_device *pdev, struct device_node *port)
+{
+        struct device_node *ep;
+        u32 datapairs;
+        int r;
+
+        ep = omapdss_of_get_next_endpoint(port, NULL);
+        if (!ep)
+                return 0;
+
+        r = of_property_read_u32(ep, "datapairs", &datapairs);
+        if (r) {
+                DSSERR("failed to parse datapairs\n");
+                goto err_datapairs;
+        }
+
+        sdi.datapairs = datapairs;
+
+        of_node_put(ep);
+
+        sdi.pdev = pdev;
+
+        sdi_init_output(pdev);
+
+        sdi.port_initialized = true;
+
+        return 0;
+
+err_datapairs:
+        of_node_put(ep);
+
+        return r;
+}
+
+void __exit sdi_uninit_port(void)
+{
+        if (!sdi.port_initialized)
+                return;
+
+        sdi_uninit_output(sdi.pdev);
+}