How to enhance NAND Flash clock in i.MX6UL

[lintunghui]

Has anyone modified the Flash clock clock in iMX6UL? I have some

problem in enhancing NAND Flash speed. I see the kerenl patch in iMX6DL

with kernel 3.0.35. The patch only use clk_set_rate to enhance enfc_clk. And

it works. So if I want to enhance the NAND Flash clock in iMX6UL with kernel 4.1.15,

what should I have to modify? 

I already tried to use clk_set_rate to set gpmi_io clock, but it not works.

Should I modify dtb file or other setting?

[lintunghui]

Thank for your answer

in kernel source code

drivers/mtd/nand/gpmi-nand/gpmi-nand.c

function gpmi_get_clks

The function set gpmi clock here, modify and it finally worked

clk_set_rate(r->clock[0], 22000000);

[art · Accepted solution]

Check the Chapter 33 of the attached document. Check the driver source code at drivers/mtd/nand/, as described in the chapter.

Have a great day,
Artur

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