media: delta-v4l2: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

media: st-delta: Remove unneeded NULL check in delta-v4l2

clk_prepare_enable() already checks NULL by using !clk.
clk_disable_unprepare() already checks NULL by using IS_ERR_OR_NULL.
Remove unneeded NULL checks before them.

Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

media: st-delta: Fix PM disable depth imbalance in delta_probe

The pm_runtime_enable will decrease power disable depth.
If the probe fails, we should use pm_runtime_disable() to balance
pm_runtime_enable().

Fixes: f386509e4959 ("[media] st-delta: STiH4xx multi-format video decoder v4l2 driver")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Acked-by: Hugues Fruchet <hugues.fruchet@foss.st.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

media: platform: place stm32/ and sti/ under st/ dir

As the end goal is to have platform drivers split by vendor,
move both stm32/ and sti/ for them to be inside st/ directory.

Acked-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>