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[media] rc: sunxi-cir: Add support for an optional reset controller

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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>
This commit is contained in:
Hans de Goede 2014-11-20 11:59:04 -03:00 committed by Mauro Carvalho Chehab
parent 2c794075d4
commit 44f8af6846
2 changed files with 25 additions and 2 deletions
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2
Documentation/devicetree/bindings/media/sunxi-ir.txt
View File

@ -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";

25
drivers/media/rc/sunxi-cir.c
View File

@ -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 */