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path: root/drivers/bus/ti-sysc.c
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Diffstat (limited to 'drivers/bus/ti-sysc.c')
-rw-r--r--drivers/bus/ti-sysc.c48
1 files changed, 47 insertions, 1 deletions
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 145dcc0cf48c..36c4c340c342 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -19,6 +19,7 @@
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
+#include <linux/reset.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/slab.h>
@@ -74,6 +75,7 @@ struct sysc {
struct clk **clocks;
const char **clock_roles;
int nr_clocks;
+ struct reset_control *rsts;
const char *legacy_mode;
const struct sysc_capabilities *cap;
struct sysc_config cfg;
@@ -214,6 +216,42 @@ static int sysc_get_clocks(struct sysc *ddata)
}
/**
+ * sysc_init_resets - reset module on init
+ * @ddata: device driver data
+ *
+ * A module can have both OCP softreset control and external rstctrl.
+ * If more complicated rstctrl resets are needed, please handle these
+ * directly from the child device driver and map only the module reset
+ * for the parent interconnect target module device.
+ *
+ * Automatic reset of the module on init can be skipped with the
+ * "ti,no-reset-on-init" device tree property.
+ */
+static int sysc_init_resets(struct sysc *ddata)
+{
+ int error;
+
+ ddata->rsts =
+ devm_reset_control_array_get_optional_exclusive(ddata->dev);
+ if (IS_ERR(ddata->rsts))
+ return PTR_ERR(ddata->rsts);
+
+ if (ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
+ goto deassert;
+
+ error = reset_control_assert(ddata->rsts);
+ if (error)
+ return error;
+
+deassert:
+ error = reset_control_deassert(ddata->rsts);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+/**
* sysc_parse_and_check_child_range - parses module IO region from ranges
* @ddata: device driver data
*
@@ -889,6 +927,7 @@ static int sysc_init_module(struct sysc *ddata)
return 0;
}
+
ddata->revision = sysc_read_revision(ddata);
pm_runtime_put_sync(ddata->dev);
@@ -1583,8 +1622,11 @@ static int sysc_probe(struct platform_device *pdev)
if (error)
goto unprepare;
- pm_runtime_enable(ddata->dev);
+ error = sysc_init_resets(ddata);
+ if (error)
+ return error;
+ pm_runtime_enable(ddata->dev);
error = sysc_init_module(ddata);
if (error)
goto unprepare;
@@ -1615,6 +1657,9 @@ static int sysc_probe(struct platform_device *pdev)
pm_runtime_put(&pdev->dev);
}
+ if (!of_get_available_child_count(ddata->dev->of_node))
+ reset_control_assert(ddata->rsts);
+
return 0;
err:
@@ -1644,6 +1689,7 @@ static int sysc_remove(struct platform_device *pdev)
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
+ reset_control_assert(ddata->rsts);
unprepare:
sysc_unprepare(ddata);