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clk: imx6q: optionally get CCM inputs via standard clock handles

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When specifying external clock inputs to the CCM the current code
requires the clocks to be in a "clocks" child node of the DT root.
This is not really conformant with DT best practices.

To avoid the need to deviate from those best practices, allow the
clock inputs to be specified via standard clock handles. This is
in line with how drivers of the later CCM driver revisions on
newer i.MX SoCs handle this.

As we can't retroactively change the DT binding, allow this as an
option with a fallback to the old way of how this has been handled.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Lucas Stach 2018-11-15 15:30:27 +01:00 committed by Stephen Boyd
parent f7542d8177
commit a29be9185d
2 changed files with 20 additions and 5 deletions
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3
Documentation/devicetree/bindings/clock/imx6q-clock.txt
View file

@ -13,6 +13,9 @@ Optional properties:
management IC (PMIC) triggered via PMIC_STBY_REQ signal.
Boards that are designed to initiate poweroff on PMIC_ON_REQ signal should
be using "syscon-poweroff" driver instead.
- clocks: list of clock specifiers, must contain an entry for each entry
in clock-names
- clock-names: valid names are "osc", "ckil", "ckih1", "anaclk1" and "anaclk2"
The clock consumer should specify the desired clock by having the clock
ID in its "clocks" phandle cell. See include/dt-bindings/clock/imx6qdl-clock.h

22
drivers/clk/imx/clk-imx6q.c
View file

@ -414,12 +414,24 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
int ret;
clk[IMX6QDL_CLK_DUMMY] = imx_clk_fixed("dummy", 0);
clk[IMX6QDL_CLK_CKIL] = imx_obtain_fixed_clock("ckil", 0);
clk[IMX6QDL_CLK_CKIH] = imx_obtain_fixed_clock("ckih1", 0);
clk[IMX6QDL_CLK_OSC] = imx_obtain_fixed_clock("osc", 0);
clk[IMX6QDL_CLK_CKIL] = of_clk_get_by_name(ccm_node, "ckil");
if (IS_ERR(clk[IMX6QDL_CLK_CKIL]))
clk[IMX6QDL_CLK_CKIL] = imx_obtain_fixed_clock("ckil", 0);
clk[IMX6QDL_CLK_CKIH] = of_clk_get_by_name(ccm_node, "ckih1");
if (IS_ERR(clk[IMX6QDL_CLK_CKIH]))
clk[IMX6QDL_CLK_CKIH] = imx_obtain_fixed_clock("ckih1", 0);
clk[IMX6QDL_CLK_OSC] = of_clk_get_by_name(ccm_node, "osc");
if (IS_ERR(clk[IMX6QDL_CLK_OSC]))
clk[IMX6QDL_CLK_OSC] = imx_obtain_fixed_clock("osc", 0);
/* Clock source from external clock via CLK1/2 PADs */
clk[IMX6QDL_CLK_ANACLK1] = imx_obtain_fixed_clock("anaclk1", 0);
clk[IMX6QDL_CLK_ANACLK2] = imx_obtain_fixed_clock("anaclk2", 0);
clk[IMX6QDL_CLK_ANACLK1] = of_clk_get_by_name(ccm_node, "anaclk1");
if (IS_ERR(clk[IMX6QDL_CLK_ANACLK1]))
clk[IMX6QDL_CLK_ANACLK1] = imx_obtain_fixed_clock("anaclk1", 0);
clk[IMX6QDL_CLK_ANACLK2] = of_clk_get_by_name(ccm_node, "anaclk2");
if (IS_ERR(clk[IMX6QDL_CLK_ANACLK2]))
clk[IMX6QDL_CLK_ANACLK2] = imx_obtain_fixed_clock("anaclk2", 0);
np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
anatop_base = base = of_iomap(np, 0);