Hi Daniel,
On 09/02/2014 03:00 PM, Daniel Thompson wrote:
The architectures where this peripheral exists (ARM and SH) have expensive
implementations of writel(), reliant on spin locks and explicit L2 cache
management. These architectures provide a cheaper writel_relaxed() which
is much better suited to peripherals that do not perform DMA. The
situation with readl()/readl_relaxed()is similar although less acute.
This driver does not use DMA and will be more power efficient and more
robust (due to absense of spin locks during console I/O) if it uses the
relaxed variants.
This change means the driver is no longer portable and therefore no
longer suitable for compile testing.
Signed-off-by: Daniel Thompson <daniel.thomp...@linaro.org>
Cc: Srinivas Kandagatla <srinivas.kandaga...@gmail.com>
Cc: Maxime Coquelin <maxime.coque...@st.com>
Cc: Patrice Chotard <patrice.chot...@st.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Jiri Slaby <jsl...@suse.cz>
Cc: ker...@stlinux.com
Cc: linux-ser...@vger.kernel.org
---
drivers/tty/serial/Kconfig | 2 +-
drivers/tty/serial/st-asc.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
You can add my:
Acked-by: Maxime Coquelin <maxime.coque...@st.com>
thanks!
Maxime
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