This adds clock support for the i.MX8MM, taken from Linux-5.5.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

This adds support for the pll14xx found on i.MX8MM devices. This is
taken from the Kernel as of v5.5. Since we'll need some early setup
for the PLL a PBL hook is added to be called from lowlevel code.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

This is based on Lucas' patch sent as "[PATCH v2 4/4] clk: imx: add
clock driver for i.MX8MQ CCM" to the mailing list.

It will likely need some rework before it is finally merged, so apply
the reworks here before merging into barebox.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
[andrew.smirnov@gmail.com: Fix pll type for IMX8MQ_VIDEO2_PLL1]
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Most i.MX6SL infrastructure is already covered in barebox by general i.MX6
support. Missing infrastructure provided in separate commits are
* SoC type detection
* Clock infrastructure

Add the missing fsl,imx6sl-mmdc, so it will not be catched by fsl,imx6q-mmdc
and the remaining bits and pieces to provide barebox i.MX6SL SoC support.

Signed-off-by: Alexander Kurz <akurz@blala.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by Juergen Borleis <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Taken from the kernel as of 4.10-rc3. Needed for i.MX7

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Based on analogous code from Linux kernel

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Port imx_check_clocks() from Linux kernel.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Move clk code from 'mach-imx' to 'drivers' to keep the code tree
structure closer to that of analogous one from Linux kernel and,
arguably although subjective, to keep 'mach-imx' less cluttered.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>