Subject: [PATCHv2 10/15] clk: mvebu: extend common code to allow an optional refclk

From: [email-masked] (Gregory CLEMENT)
Date: Mon, 23 Feb 2015 19:06:24 +0100

Hi Mike,

On 20/02/2015 19:21, Mike Turquette wrote:
> Quoting Thomas Petazzoni (2015-02-20 09:04:29)
>> The Armada 39x, contrary to its predecessor, has a configurable
>> reference clock frequency, of either 25 Mhz, or 40 Mhz. For the
>> previous SoCs, it was fixed to 25 Mhz and described directly as such
>> in the Device Tree.
>>
>> For Armada 39x, we need to read certain registers to know whether the
>> frequency is 25 or 40 Mhz. Therefore, this commit extends the common
>> mvebu clock code to allow the SoC-specific code to say it wants to
>> register a reference clock, by giving a non-NULL ->get_refclk_freq()
>> function pointer in its coreclk_soc_desc structure.
>>
>> Signed-off-by: Thomas Petazzoni <[email-masked]>
> 
> Looks fine to me. I'll apply after -rc1 drops.

What about the other clock related patch: "clk: mvebu: add Marvell
Armada 39x driver" ? Will you apply it too, or do you expect a pull request
for the mvebu related clocks ?

Thanks,

Gregory

> 
> Regards,
> Mike
> 
>> ---
>>  drivers/clk/mvebu/common.c | 17 +++++++++++++++++
>>  drivers/clk/mvebu/common.h |  1 +
>>  2 files changed, 18 insertions(+)
>>
>> diff --git a/drivers/clk/mvebu/common.c b/drivers/clk/mvebu/common.c
>> index 0d4d121..15b370f 100644
>> --- a/drivers/clk/mvebu/common.c
>> +++ b/drivers/clk/mvebu/common.c
>> @@ -121,6 +121,11 @@ void __init mvebu_coreclk_setup(struct device_node *np,
>>  
>>         /* Allocate struct for TCLK, cpu clk, and core ratio clocks */
>>         clk_data.clk_num = 2 + desc->num_ratios;
>> +
>> +       /* One more clock for the optional refclk */
>> +       if (desc->get_refclk_freq)
>> +               clk_data.clk_num += 1;
>> +
>>         clk_data.clks = kzalloc(clk_data.clk_num * sizeof(struct clk *),
>>                                 GFP_KERNEL);
>>         if (WARN_ON(!clk_data.clks)) {
>> @@ -162,6 +167,18 @@ void __init mvebu_coreclk_setup(struct device_node *np,
>>                 WARN_ON(IS_ERR(clk_data.clks[2+n]));
>>         };
>>  
>> +       /* Register optional refclk */
>> +       if (desc->get_refclk_freq) {
>> +               const char *name = "refclk";
>> +               of_property_read_string_index(np, "clock-output-names",
>> +                                             2 + desc->num_ratios, &name);
>> +               rate = desc->get_refclk_freq(base);
>> +               clk_data.clks[2 + desc->num_ratios] =
>> +                       clk_register_fixed_rate(NULL, name, NULL,
>> +                                               CLK_IS_ROOT, rate);
>> +               WARN_ON(IS_ERR(clk_data.clks[2 + desc->num_ratios]));
>> +       }
>> +
>>         /* SAR register isn't needed anymore */
>>         iounmap(base);
>>  
>> diff --git a/drivers/clk/mvebu/common.h b/drivers/clk/mvebu/common.h
>> index 783b563..f0de6c8 100644
>> --- a/drivers/clk/mvebu/common.h
>> +++ b/drivers/clk/mvebu/common.h
>> @@ -30,6 +30,7 @@ struct coreclk_soc_desc {
>>         u32 (*get_tclk_freq)(void __iomem *sar);
>>         u32 (*get_cpu_freq)(void __iomem *sar);
>>         void (*get_clk_ratio)(void __iomem *sar, int id, int *mult, int *div);
>> +       u32 (*get_refclk_freq)(void __iomem *sar);
>>         bool (*is_sscg_enabled)(void __iomem *sar);
>>         u32 (*fix_sscg_deviation)(u32 system_clk);
>>         const struct coreclk_ratio *ratios;
>> -- 
>> 2.1.0
>>

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com