On Tue, 2017-04-18 at 16:51 +0530, Vivek Gautam wrote:
> Many devices may want to request a bunch of resets
> and control them. So it's better to manage them as an
> array. Add APIs to _get(), _assert(), and _deassert()
> an array of reset_control.
Thanks! This looks good to me, one small issue below.
> Cc: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> Signed-off-by: Vivek Gautam <vivek.gautam@xxxxxxxxxxxxxx>
> ---
> drivers/reset/core.c | 177 ++++++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/reset.h | 93 ++++++++++++++++++++++++++
> 2 files changed, 270 insertions(+)
>
> diff --git a/drivers/reset/core.c b/drivers/reset/core.c
> index f0a06a7aca93..54bd3be5e7a4 100644
> --- a/drivers/reset/core.c
> +++ b/drivers/reset/core.c
> @@ -488,3 +488,180 @@ int of_reset_control_get_count(struct device_node *node)
> return count;
> }
> EXPORT_SYMBOL_GPL(of_reset_control_get_count);
> +
> +/**
> + * APIs to manage an array of reset controls.
> + */
> +/**
> + * reset_control_array_assert: assert a list of resets
> + *
> + * @resets: reset control array holding info about the list of resets
> + *
> + * This API doesn't guarantee that the reset lines controlled by
> + * the reset array are asserted in any particular order.
> + *
> + * Returns 0 on success or error number on failure.
> + */
> +int reset_control_array_assert(struct reset_control_array *resets)
> +{
> + int ret, i;
> +
> + if (!resets)
> + return 0;
> +
> + if (IS_ERR(resets))
> + return -EINVAL;
> +
> + for (i = 0; i < resets->num_rstcs; i++) {
> + ret = reset_control_assert(resets->rstc[i]);
> + if (ret)
> + return ret;
This should try to deassert the already asserted resets in the error
case.
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(reset_control_array_assert);
> +
> +/**
> + * reset_control_array_deassert: deassert a list of resets
> + *
> + * @resets: reset control array holding info about the list of resets
> + *
> + * This API doesn't guarantee that the reset lines controlled by
> + * the reset array are deasserted in any particular order.
> + *
> + * Returns 0 on success or error number on failure.
> + */
> +int reset_control_array_deassert(struct reset_control_array *resets)
> +{
> + int ret, i;
> +
> + if (!resets)
> + return 0;
> +
> + if (IS_ERR(resets))
> + return -EINVAL;
> +
> + for (i = 0; i < resets->num_rstcs; i++) {
> + ret = reset_control_deassert(resets->rstc[i]);
> + if (ret)
> + goto err;
> + }
> +
> + return 0;
> +
> +err:
> + while (i--)
> + reset_control_assert(resets->rstc[i]);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(reset_control_array_deassert);
As this already does.
regards
Philipp
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