PM / AVS: SmartReflex: Prepare to use device tree based probing

We are currently probing smartreflex with omap_device while we are
already probing smartreflex related interconnect target module with
ti-sysc driver and dts data.

Before we can flip things on for ti-sysc, we need to prepare the
smartreflex driver a bit:

1. The smartreflex clock is really for the whole interconnect target
   module. So it may be configured at the parent device level with
   ti-sysc

2. With ti-sysc, we have the child device manage interconnect target
   module directly if pm_runtime_irq_safe() is set and there is only
   one child. In that case nobody else is going to call pm_runtime_get
   and put, so we need to add these calls to idle smartreflex properly
   after probe if not fully configured

3. With ti-sysc, the parent driver may rebind. So we want to use
   platform_driver_register() and don't want probe to be __init

Note that this patch depends on the related changes to ti-sysc driver
and omap_device probing to prevent both ti-sysc and omap_device to
try to probe smartreflex.

Cc: linux-pm@vger.kernel.org
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/power/avs/smartreflex.c b/drivers/power/avs/smartreflex.c
index 89bf4d6..cb02371 100644 (file)
--- a/drivers/power/avs/smartreflex.c
+++ b/drivers/power/avs/smartreflex.c
@@ -132,12 +132,16 @@ static void sr_set_clk_length(struct omap_sr *sr)
        struct clk *fck;
        u32 fclk_speed;
 
-       fck = clk_get(&sr->pdev->dev, "fck");
-
+       /* Try interconnect target module fck first if it already exists */
+       fck = clk_get(sr->pdev->dev.parent, "fck");
        if (IS_ERR(fck)) {
-               dev_err(&sr->pdev->dev, "%s: unable to get fck for device %s\n",
-                       __func__, dev_name(&sr->pdev->dev));
-               return;
+               fck = clk_get(&sr->pdev->dev, "fck");
+               if (IS_ERR(fck)) {
+                       dev_err(&sr->pdev->dev,
+                               "%s: unable to get fck for device %s\n",
+                               __func__, dev_name(&sr->pdev->dev));
+                       return;
+               }
        }
 
        fclk_speed = clk_get_rate(fck);
@@ -838,7 +842,7 @@ static int omap_sr_autocomp_store(void *data, u64 val)
 DEFINE_SIMPLE_ATTRIBUTE(pm_sr_fops, omap_sr_autocomp_show,
                        omap_sr_autocomp_store, "%llu\n");
 
-static int __init omap_sr_probe(struct platform_device *pdev)
+static int omap_sr_probe(struct platform_device *pdev)
 {
        struct omap_sr *sr_info;
        struct omap_sr_data *pdata = pdev->dev.platform_data;
@@ -898,6 +902,12 @@ static int __init omap_sr_probe(struct platform_device *pdev)
 
        list_add(&sr_info->node, &sr_list);
 
+       ret = pm_runtime_get_sync(&pdev->dev);
+       if (ret < 0) {
+               pm_runtime_put_noidle(&pdev->dev);
+               goto err_list_del;
+       }
+
        /*
         * Call into late init to do initializations that require
         * both sr driver and sr class driver to be initiallized.
@@ -966,12 +976,17 @@ static int __init omap_sr_probe(struct platform_device *pdev)
 
        }
 
+       pm_runtime_put_sync(&pdev->dev);
+
        return ret;
 
 err_debugfs:
        debugfs_remove_recursive(sr_info->dbg_dir);
 err_list_del:
        list_del(&sr_info->node);
+
+       pm_runtime_put_sync(&pdev->dev);
+
        return ret;
 }
 
@@ -1025,11 +1040,23 @@ static void omap_sr_shutdown(struct platform_device *pdev)
        return;
 }
 
+static const struct of_device_id omap_sr_match[] = {
+       { .compatible = "ti,omap3-smartreflex-core", },
+       { .compatible = "ti,omap3-smartreflex-mpu-iva", },
+       { .compatible = "ti,omap4-smartreflex-core", },
+       { .compatible = "ti,omap4-smartreflex-mpu", },
+       { .compatible = "ti,omap4-smartreflex-iva", },
+       {  },
+};
+MODULE_DEVICE_TABLE(of, omap_sr_match);
+
 static struct platform_driver smartreflex_driver = {
+       .probe          = omap_sr_probe,
        .remove         = omap_sr_remove,
        .shutdown       = omap_sr_shutdown,
        .driver         = {
                .name   = DRIVER_NAME,
+               .of_match_table = omap_sr_match,
        },
 };
 
@@ -1048,7 +1075,7 @@ static int __init sr_init(void)
        else
                pr_warn("%s: No PMIC hook to init smartreflex\n", __func__);
 
-       ret = platform_driver_probe(&smartreflex_driver, omap_sr_probe);
+       ret = platform_driver_register(&smartreflex_driver);
        if (ret) {
                pr_err("%s: platform driver register failed for SR\n",
                       __func__);