On 10/10/2013 07:10 PM, Soren Brinkmann wrote:

In some use cases Zynq's FPGA clocks are used as static clock
generators for IP in the FPGA part of the SOC for which no Linux driver
exists and would control those clocks. To avoid automatic
gating of these clocks in such cases a new property - fclk-enable - is
added to the clock controller's DT description to accomodate such use
cases. It's value is a bitmask, where a set bit results in enabling
the corresponding FCLK through the clkc.

FPGA clocks are handled following the rules below:

If an FCLK is not enabled by bootloaders, that FCLK will be disabled in
Linux. Drivers can enable and control it through the CCF as usual.

If an FCLK is enabled by bootloaders AND the corresponding bit in the
'fclk-enable' DT property is set, that FCLK will be enabled by the clkc,
resulting in an off by one reference count for that clock. Ensuring it
will always be running.

Signed-off-by: Soren Brinkmann <redacted>
---
v2:
 - change default value for fclk-enable to '0'
---
 Documentation/devicetree/bindings/clock/zynq-7000.txt |  4 ++++
 drivers/clk/zynq/clkc.c                               | 18 +++++++++++++++---
 2 files changed, 19 insertions(+), 3 deletions(-)

For both patches:
Acked-by: Michal Simek <redacted>

Mike: Can you please add both these patches to your tree?
There shouldn't be any conflict with DT patch itself.
But if you don't want to add 2/2 through your tree, I am also fine
with taking this through my zynq tree.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform


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