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authorHans de Goede <hdegoede@redhat.com>2014-11-20 11:59:04 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-01-29 18:26:08 -0200
commit44f8af68469a9a7c8507fade3e4ca4bba58c2ff1 (patch)
tree4d17c6d0985aa804c5dc18d790d7fa76f330882b
parent2c794075d420f22ba4280f46ac7d43be0acb3e95 (diff)
[media] rc: sunxi-cir: Add support for an optional reset controller
On sun6i the cir block is attached to the reset controller, add support for de-asserting the reset if a reset controller is specified in dt. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
-rw-r--r--Documentation/devicetree/bindings/media/sunxi-ir.txt2
-rw-r--r--drivers/media/rc/sunxi-cir.c25
2 files changed, 25 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/media/sunxi-ir.txt b/Documentation/devicetree/bindings/media/sunxi-ir.txt
index 23dd5ad07b7c..6b70b9b47b7d 100644
--- a/Documentation/devicetree/bindings/media/sunxi-ir.txt
+++ b/Documentation/devicetree/bindings/media/sunxi-ir.txt
@@ -10,6 +10,7 @@ Required properties:
Optional properties:
- linux,rc-map-name : Remote control map name.
+- resets : phandle + reset specifier pair
Example:
@@ -17,6 +18,7 @@ ir0: ir@01c21800 {
compatible = "allwinner,sun4i-a10-ir";
clocks = <&apb0_gates 6>, <&ir0_clk>;
clock-names = "apb", "ir";
+ resets = <&apb0_rst 1>;
interrupts = <0 5 1>;
reg = <0x01C21800 0x40>;
linux,rc-map-name = "rc-rc6-mce";
diff --git a/drivers/media/rc/sunxi-cir.c b/drivers/media/rc/sunxi-cir.c
index 340f7f51eed4..06170e01a5e9 100644
--- a/drivers/media/rc/sunxi-cir.c
+++ b/drivers/media/rc/sunxi-cir.c
@@ -23,6 +23,7 @@
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_platform.h>
+#include <linux/reset.h>
#include <media/rc-core.h>
#define SUNXI_IR_DEV "sunxi-ir"
@@ -95,6 +96,7 @@ struct sunxi_ir {
int irq;
struct clk *clk;
struct clk *apb_clk;
+ struct reset_control *rst;
const char *map_name;
};
@@ -166,15 +168,29 @@ static int sunxi_ir_probe(struct platform_device *pdev)
return PTR_ERR(ir->clk);
}
+ /* Reset (optional) */
+ ir->rst = devm_reset_control_get_optional(dev, NULL);
+ if (IS_ERR(ir->rst)) {
+ ret = PTR_ERR(ir->rst);
+ if (ret == -EPROBE_DEFER)
+ return ret;
+ ir->rst = NULL;
+ } else {
+ ret = reset_control_deassert(ir->rst);
+ if (ret)
+ return ret;
+ }
+
ret = clk_set_rate(ir->clk, SUNXI_IR_BASE_CLK);
if (ret) {
dev_err(dev, "set ir base clock failed!\n");
- return ret;
+ goto exit_reset_assert;
}
if (clk_prepare_enable(ir->apb_clk)) {
dev_err(dev, "try to enable apb_ir_clk failed\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto exit_reset_assert;
}
if (clk_prepare_enable(ir->clk)) {
@@ -271,6 +287,9 @@ exit_clkdisable_clk:
clk_disable_unprepare(ir->clk);
exit_clkdisable_apb_clk:
clk_disable_unprepare(ir->apb_clk);
+exit_reset_assert:
+ if (ir->rst)
+ reset_control_assert(ir->rst);
return ret;
}
@@ -282,6 +301,8 @@ static int sunxi_ir_remove(struct platform_device *pdev)
clk_disable_unprepare(ir->clk);
clk_disable_unprepare(ir->apb_clk);
+ if (ir->rst)
+ reset_control_assert(ir->rst);
spin_lock_irqsave(&ir->ir_lock, flags);
/* disable IR IRQ */

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