Re: [PATCH 1/1] ep93xx: clock: convert in-place to COMMON_CLK

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Alexander,

On Sat, Jun 12, 2021 at 12:42 AM Alexander Sverdlin
<alexander.sverdlin@gmail.com> wrote:
> On Tue, 2021-05-25 at 11:33 +0300, Nikita Shubin wrote:
> > Converted in-place without moving file to drivers/clk.
> >
> > tested on ts7250 (EP9302).
> >
> > Only setting rate and change parent tested for, as they
> > are missing on ts7250:
> > - video
> > - I2S
> > - ADC/KEYPAD
> > - PWM
> >
> > Only video and I2S clock are interesting, as they are
> > GATE + double DIV + MUX, all other are pretty much
> > common but require ep93xx_syscon_swlocked_write to set
> > registers.
>
> This doesnt look good in my test:
>
>
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:1011 clk_core_enable+0x9c/0xbc
> Enabling unprepared ep93xx-adc

> [<c0266560>] (ep93xx_adc_probe) from [<c02126e0>] (platform_probe+0x34/0x80)

> WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:1011 clk_core_enable+0x9c/0xbc
> Enabling unprepared ep93xx-spi.0

> [<c023eeb4>] (ep93xx_spi_prepare_hardware) from [<c023c0f8>] (__spi_pump_messages+0x124/0x620)

> WARNING: CPU: 0 PID: 36 at drivers/clk/clk.c:952 clk_core_disable+0xbc/0xd8
> ep93xx-spi.0 already disabled
> [<c023ee98>] (ep93xx_spi_unprepare_hardware) from [<c023c35c>] (__spi_pump_messages+0x388/0x620)

These are issues in individual drivers, not in the CCF implementation.
All drivers using the clock API should be converted from
clk_{en,dis}able() to clk_{prepare_enable,disable_unprepare}() first.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds