[PATCH v4 5/8] reset: starfive: Introduce active_low
Changhuang Liang <[email protected]>
| Newsgroups | org.infradead.lists.linux-riscv,org.kernel.vger.linux-clk,org.kernel.vger.linux-devicetree,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
The JHB100 SoC supports inverted operations for reset assertion/deassertion, introducing an active_low field to distinguish between different operation logics. Signed-off-by: Changhuang Liang <[email protected]> --- drivers/reset/starfive/reset-starfive-common.c | 6 +++++- drivers/reset/starfive/reset-starfive-common.h | 6 ++++++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/reset/starfive/reset-starfive-common.c b/drivers/reset/starfive/reset-starfive-common.c index 86dbb33bb216..7723520637ca 100644 --- a/drivers/reset/starfive/reset-starfive-common.c +++ b/drivers/reset/starfive/reset-starfive-common.c @@ -52,12 +52,16 @@ static int starfive_reset_update(struct reset_controller_dev *rcdev, unsigned long id, bool assert) { struct starfive_reset *data = starfive_reset_from(rcdev); + bool active_low = data->info && data->info->active_low; unsigned long offset, flags; void __iomem *reg_assert; void __iomem *reg_status; u32 mask, done, value; int ret; + if (active_low) + assert = !assert; + if (data->info && data->info->discontiguous) { id = starfive_reset_id_to_hw_id(data->info->map, data->info->nr_resets, id); if (id == STARFIVE_RESET_ID_INVALID) @@ -70,7 +74,7 @@ static int starfive_reset_update(struct reset_controller_dev *rcdev, reg_status = data->status + offset * sizeof(u32); done = data->asserted ? data->asserted[offset] & mask : 0; - if (!assert) + if (active_low == assert) done ^= mask; spin_lock_irqsave(&data->lock, flags); diff --git a/drivers/reset/starfive/reset-starfive-common.h b/drivers/reset/starfive/reset-starfive-common.h index 0d4e634de58e..c7f80e744700 100644 --- a/drivers/reset/starfive/reset-starfive-common.h +++ b/drivers/reset/starfive/reset-starfive-common.h @@ -15,6 +15,12 @@ struct starfive_reset_info { unsigned int nr_resets; unsigned int assert_offset; unsigned int status_offset; + + /* If active_low is false, setting the bit to 1 asserts + * the signal while clearing it to 0 deasserts it, and vice + * versa. + */ + bool active_low; bool discontiguous; const struct starfive_reset_map *map; }; -- 2.25.1 _______________________________________________ linux-riscv mailing list [email protected] http://lists.infradead.org/mailman/listinfo/linux-riscv