lkml.org 
[lkml]   [2020]   [Jul]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v1] clk: Export __clk_lookup()
From
Date

在 2020/7/23 上午8:51, Stephen Boyd 写道:
> Quoting Heiko Stuebner (2020-07-22 11:26:50)
>> Hi Elaine,
>>
>> Am Mittwoch, 22. Juli 2020, 04:32:30 CEST schrieb Elaine Zhang:
>>> Export __clk_lookup() to support user built as module.
>>>
>>> ERROR:
>>> drivers/clk/rockchip/clk.ko: In function
>>> `rockchip_clk_protect_critical':
>>> drivers/clk/rockchip/clk.c:741:
>>> undefined reference to `__clk_lookup'
>> can you elaborate a bit more on why this would be needed?
>>
>> Because right now the Rockchip clocks are of course built into
>> the main kernel image (especially due to them being needed during early
>> boot) and __clk_lookup actually is a pretty deep part of the clock-
>> framework itself, as probably also denoted by the "__" in the function
>> name.
>>
> Can you stop using __clk_lookup()? The plan is to remove it.

Rk use  __clk_lookup() as:

drivers/clk/rockchip/clk.c

void __init rockchip_clk_protect_critical(const char *const clocks[],
                                          int nclocks)
{
        int i;

        /* Protect the clocks that needs to stay on */
        for (i = 0; i < nclocks; i++) {
                struct clk *clk = __clk_lookup(clocks[i]);

                if (clk)
                        clk_prepare_enable(clk);
        }
}
e.g:

drivers/clk/rockchip/clk-rk3328.c

static const char *const rk3328_critical_clocks[] __initconst = {
        "aclk_bus",
        "aclk_bus_niu",
        "pclk_bus",
        "pclk_bus_niu",
        "hclk_bus",
        "hclk_bus_niu",
        "aclk_peri",
............

};

If have plan to remove the __clk_lookup, I need to replace the
rockchip_clk_protect_critical, and use the flag CLK_IS_CRITICAL.(but use
flag CLK_IS_CRITICAL, the enable count is always "0")

>
>


\
 
 \ /
  Last update: 2020-07-23 03:43    [W:0.062 / U:0.052 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site