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| author | Kaihua Zhong | 2017-11-17 10:27:31 +0100 |
|---|---|---|
| committer | Stephen Boyd | 2017-12-07 08:01:46 +0100 |
| commit | 4f16f7ff3bc02f6e1845677235fea157bdc0e59c (patch) | |
| tree | d8d4038a76f3c69627f1f93a09b4895c36052ba5 /drivers/clk/hisilicon/Kconfig | |
| parent | dt-bindings: clk: Hi3660: Document stub clock (diff) | |
| download | kernel-qcow2-linux-4f16f7ff3bc02f6e1845677235fea157bdc0e59c.tar.gz kernel-qcow2-linux-4f16f7ff3bc02f6e1845677235fea157bdc0e59c.tar.xz kernel-qcow2-linux-4f16f7ff3bc02f6e1845677235fea157bdc0e59c.zip | |
clk: hisilicon: Add support for Hi3660 stub clocks
Hi3660 has four stub clocks, which are big and LITTLE cluster clocks,
GPU clock and DDR clock. These clocks ask MCU for frequency scaling
by sending message through mailbox.
This commit adds support for stub clocks, it requests the dedicated
mailbox channel at initialization; then later uses this channel to send
message to MCU to execute frequency scaling. The four stub clocks share
the same mailbox channel, but every stub clock has its own command id so
MCU can distinguish the requirement coming for which clock.
A shared memory is used to present effective frequency value, so the
clock driver uses I/O mapping for the memory and reads back rate value.
Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Kai Zhao <zhaokai1@hisilicon.com>
Signed-off-by: Tao Wang <kevin.wangtao@hisilicon.com>
Signed-off-by: Ruyi Wang <wangruyi@huawei.com>
Signed-off-by: Kaihua Zhong <zhongkaihua@huawei.com>
[sboyd: Fix possible out of bounds access in hi3660_stub_clk_hw_get(),
use devm_of_clk_add_hw_provider(), devm_ioremap() returns
NULL not error pointers]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Diffstat (limited to 'drivers/clk/hisilicon/Kconfig')
| -rw-r--r-- | drivers/clk/hisilicon/Kconfig | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/clk/hisilicon/Kconfig b/drivers/clk/hisilicon/Kconfig index 7098bfd32b1b..1bd43550e4c8 100644 --- a/drivers/clk/hisilicon/Kconfig +++ b/drivers/clk/hisilicon/Kconfig @@ -49,3 +49,9 @@ config STUB_CLK_HI6220 default ARCH_HISI help Build the Hisilicon Hi6220 stub clock driver. + +config STUB_CLK_HI3660 + bool "Hi3660 Stub Clock Driver" + depends on COMMON_CLK_HI3660 && MAILBOX + help + Build the Hisilicon Hi3660 stub clock driver. |