clk: imx: scu: add two cells binding support

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This patch implements the new two cells binding for SCU clocks.
The usage is as follows:
clocks = <&uart0_clk IMX_SC_R_UART_0 IMX_SC_PM_CLK_PER>

Due to each SCU clock is associated with a power domain, without power
on the domain, the SCU clock can't work. So we create platform devices
for each domain clock respectively and manually attach the required domain
before register the clock devices, then we can register clocks in the
clock platform driver accordingly.

Note because we do not have power domain info in device tree and the SCU
resource ID is the same for power domain and clock, so we use resource ID
to find power domains.

Later, we will also use this clock platform driver to support suspend/resume
and runtime pm.

Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Michael Turquette <mturquette@baylibre.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

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This commit is contained in:

Dong Aisheng 2020-07-29 16:00:10 +08:00 • committed by Shawn Guo

parent 3650b228f8

commit 77d8f3068c

3 changed files with 252 additions and 67 deletions

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136

drivers/clk/imx/clk-imx8qxp.c

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156

drivers/clk/imx/clk-scu.c

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27

drivers/clk/imx/clk-scu.h

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