kernel/drivers/clk/imx/clk-scu.h, branch master

clk: scu/imx8qxp: do not register driver in probe()

2026-02-24T11:54:17Z

imx_clk_scu_init() registers the imx_clk_scu_driver while commonly being called from IMX driver's probe() callbacks. However, it neither makes sense to register drivers from probe() callbacks of other drivers, nor does the driver core allow registering drivers with a device lock already being held. The latter was revealed by commit dc23806a7c47 ("driver core: enforce device_lock for driver_match_device()") leading to a deadlock condition described in [1]. Besides that, nothing seems to unregister the imx_clk_scu_driver once the corresponding driver module is unloaded, which leaves the driver-core with a dangling pointer. Also, if there are multiple matching devices for the imx8qxp_clk_driver, imx8qxp_clk_probe() calls imx_clk_scu_init() multiple times. However, any subsequent call after the first one will fail, since the driver-core does not allow to register the same struct platform_driver multiple times. Hence, register the imx_clk_scu_driver from module_init() and unregister it in module_exit(). Note that we first register the imx8qxp_clk_driver and then call imx_clk_scu_module_init() to avoid having to call imx_clk_scu_module_exit() in the unwind path of imx8qxp_clk_init(). Fixes: dc23806a7c47 ("driver core: enforce device_lock for driver_match_device()") Fixes: 220175cd3979 ("clk: imx: scu: fix build break when compiled as modules") Reported-by: Alexander Stein Closes: https://lore.kernel.org/lkml/13955113.uLZWGnKmhe@steina-w/ Tested-by: Alexander Stein # TQMa8x/MBa8x Link: https://lore.kernel.org/lkml/DFU7CEPUSG9A.1KKGVW4HIPMSH@kernel.org/ [1] Acked-by: Abel Vesa Reviewed-by: Daniel Baluta Link: https://patch.msgid.link/20260212235842.85934-1-dakr@kernel.org Signed-off-by: Danilo Krummrich

clk: imx: Add imx8dxl clk driver

2022-01-29T13:12:07Z

Add files for imx8dxl clk driver which is based on imx8qxp clock driver. Signed-off-by: Jacky Bai Signed-off-by: Abel Vesa Acked-by: Stephen Boyd Link: https://lore.kernel.org/r/1639747533-9778-1-git-send-email-abel.vesa@nxp.com

clk: imx8qm: add clock valid resource checking

2021-06-14T09:33:22Z

Add imx8qm clock valid resource checking mechanism Signed-off-by: Dong Aisheng Reviewed-by: Abel Vesa Signed-off-by: Abel Vesa

clk: imx8qxp: add clock valid checking mechnism

2021-06-14T09:33:19Z

clk-imx8qxp is a common SCU clock driver used by both QM and QXP platforms. The clock numbers vary a bit between those two platforms. This patch introduces a mechanism to only register the valid clocks for one platform by checking the clk resource id table. Signed-off-by: Dong Aisheng Reviewed-by: Abel Vesa Signed-off-by: Abel Vesa

clk: imx: scu: add gpr clocks support

2021-06-14T09:33:17Z

SCU clock protocol supports a few clocks based on GPR controller registers including mux/divider/gate. Add a generic clock register API to support them all. Signed-off-by: Dong Aisheng Reviewed-by: Abel Vesa Signed-off-by: Abel Vesa

clk: imx: scu: remove legacy scu clock binding support

2021-06-14T09:33:14Z

Legacy scu clock binding are not maintained anymore, it has a very limited clocks supported during initial upstreaming and obviously unusable by products. So it's meaningless to keep it in kernel which worse the code readability. Remove it to keep code much cleaner. Signed-off-by: Dong Aisheng Reviewed-by: Abel Vesa Signed-off-by: Abel Vesa

clk: imx: lpcg: add suspend/resume support

2020-10-26T02:54:08Z

LPCG clock state may be lost when it's power domain is completely off during system suspend/resume and we need save and restore the state properly. Reviewed-by: Stephen Boyd Signed-off-by: Dong Aisheng Signed-off-by: Shawn Guo

clk: imx: lpcg: allow lpcg clk to take device pointer

2020-10-26T02:54:02Z

Used to support runtime pm. Reviewed-by: Stephen Boyd Signed-off-by: Dong Aisheng Signed-off-by: Shawn Guo

clk: imx: imx8qxp-lpcg: add parsing clocks from device tree

2020-10-26T02:54:00Z

One LPCG controller supports up to 8 clock outputs while each of them is fixed to 4 bits. It supports only gating function with fixed bits. So we can use the clk-indices to fetch the corresponding clock idx from device tree. With this way, we can write a generic LPCG clock drivers. This patch add that support to parse clocks from device tree. Cc: Shawn Guo Cc: Sascha Hauer Cc: Michael Turquette Reviewed-by: Stephen Boyd Signed-off-by: Dong Aisheng Signed-off-by: Shawn Guo

clk: imx: scu: allow scu clk to take device pointer

2020-10-26T02:53:51Z

Used to support runtime pm. Cc: Shawn Guo Cc: Sascha Hauer Cc: Michael Turquette Reviewed-by: Stephen Boyd Signed-off-by: Dong Aisheng Signed-off-by: Shawn Guo