Re: [PATCH v1 1/4] clk: tegra20: Add DEV1/DEV2 OSC dividers

Dmitry Osipenko
2018-04-27T12:54:51Z

Hi Marcel,

On 27.04.2018 15:33, Ziswiler wrote:
> Hi Dmitry
>
> Isn't the CLK_RST_CONTROLLER_MISC_CLK_ENB_0 the other way around e.g.
> DEV1_OSC_DIV_SEL at bit 23:22 and DEV2_OSC_DIV_SEL at 21:20?
>
> On Fri, 2018-04-27 at 02:58 +0300, Dmitry Osipenko wrote:
>> CDEV1/CDEV2 clocks could have corresponding oscillator clock divider
>> as
>> a parent. Add these dividers in order to be able to provide that
>> parent
>> option.
>>
>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
>> ---
>> drivers/clk/tegra/clk-tegra20.c | 12 ++++++++++++
>> 1 file changed, 12 insertions(+)
>>
>> diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-
>> tegra20.c
>> index 0ee56dd04cec..16cf4108f2ff 100644
>> --- a/drivers/clk/tegra/clk-tegra20.c
>> +++ b/drivers/clk/tegra/clk-tegra20.c
>> @@ -26,6 +26,8 @@
>> #include "clk.h"
>> #include "clk-id.h"
>>
>> +#define MISC_CLK_ENB 0x48
>> +
>> #define OSC_CTRL 0x50
>> #define OSC_CTRL_OSC_FREQ_MASK (3<<30)
>> #define OSC_CTRL_OSC_FREQ_13MHZ (0<<30)
>> @@ -831,6 +833,16 @@ static void __init tegra20_periph_clk_init(void)
>> periph_clk_enb_refcnt);
>> clks[TEGRA20_CLK_PEX] = clk;
>>
>> + /* cdev1 OSC divider */
>> + clk_register_divider(NULL, "cdev1_osc_div", "clk_m",
>> + 0, clk_base + MISC_CLK_ENB, 20, 2,
>
> So it would be:
>
> + 0, clk_base + MISC_CLK_ENB, 22, 2,
>
>> + CLK_DIVIDER_POWER_OF_TWO, NULL);
>> +
>> + /* cdev2 OSC divider */
>> + clk_register_divider(NULL, "cdev2_osc_div", "clk_m",
>> + 0, clk_base + MISC_CLK_ENB, 22, 2,
>
> And:
>
> + 0, clk_base + MISC_CLK_ENB, 20, 2,
>
>> + CLK_DIVIDER_POWER_OF_TWO, NULL);
>> +
>> /* cdev1 */
>> clk = clk_register_fixed_rate(NULL, "cdev1_fixed", NULL, 0,
>> 26000000);
>> clk = tegra_clk_register_periph_gate("cdev1", "cdev1_fixed",
>> 0,
Indeed, good catch! I'll wait for more comments and then re-spin patchset with
the fix. Thank you.