The io-domain registers on RK3568 SoCs have three separated bits to
enable/disable the 1.8v/2.5v/3.3v power.
This patch make the write to be a operation, allow rk3568 uses a private
register set function.
Since the 2.5v mode hasn't been fully validated yet, the driver only sets
1.8v [enable] + 3.3v [disable] for 1.8v mode
1.8v [disable] + 3.3v [enable] for 3.3v mode
There is not register order requirement which has been cleared by our IC
team.
For future reference the full usage matrix including the 2.5V setting is:
case V33 V25 V18 result
0 0 0 0 IO safe, but cannot work
1 0 0 1 IO require 1.8V, should < 1.98V, otherwise IO may damage
2 0 1 0 IO require 2.5V, should < 2.75V, otherwise IO may damage
3 0 1 1 Invalid state, should avoid
4 1 0 0 IO require 3.3V, should < 3.63V, otherwise IO may damage
5 1 0 1 IO require 1.8V, should < 1.98V, otherwise IO may damage
6 1 1 0 IO require 2.5V, should < 2.75V, otherwise IO may damage
7 1 1 1 Invalid state, should avoid
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
[added mode clarification from Jay]
Link: https://lore.kernel.org/r/20210805120107.27007-3-michael.riesch@wolfvision.net
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.
Fixes: e943c43b32 ("PM: AVS: rockchip-io: Move the driver to the rockchip specific drivers")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Link: https://lore.kernel.org/r/1607070805-33038-1-git-send-email-zhangchangzhong@huawei.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
The avs drivers are all SoC specific drivers that doesn't share any code.
Instead they are located in a directory, mostly to keep similar
functionality together. From a maintenance point of view, it makes better
sense to collect SoC specific drivers like these, into the SoC specific
directories.
Therefore, let's move the rockchip-io driver to the rockchip directory.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-10-16 18:23:15 +02:00
Renamed from drivers/power/avs/rockchip-io-domain.c (Browse further)
