[linux-sunxi] [PATCH 4/9] rc: sunxi-cir: Add support for an optional reset controller

[julian.calaby@gmail.com (Julian Calaby)]

Hi Hans,

On Fri, Nov 21, 2014 at 2:55 AM, Hans de Goede <hdegoede@redhat.com> wrote:
> 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>
> ---
>  drivers/media/rc/sunxi-cir.c | 25 +++++++++++++++++++++++--
>  1 file changed, 23 insertions(+), 2 deletions(-)

Shouldn't we be updating the binding documentation?

> diff --git a/drivers/media/rc/sunxi-cir.c b/drivers/media/rc/sunxi-cir.c
> index bcee8e1..895fb65 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 */
> --
> 2.1.0
>
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-- 
Julian Calaby

Email: julian.calaby at gmail.com
Profile: http://www.google.com/profiles/julian.calaby/