From: Marcin Wojtas <mw@semihalf.com>
To: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: linux-kernel@vger.kernel.org,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
linux-clk@vger.kernel.org, "Stephen Boyd" <sboyd@codeaurora.org>,
"Michael Turquette" <mturquette@baylibre.com>,
"Andrew Lunn" <andrew@lunn.ch>,
"Jason Cooper" <jason@lakedaemon.net>,
"Tomasz Nowicki" <tn@semihalf.com>,
nadavh@marvell.com, "Lior Amsalem" <alior@marvell.com>,
"Grzegorz Jaszczyk" <jaz@semihalf.com>,
"Gregory Clément" <gregory.clement@free-electrons.com>,
"Sebastian Hesselbarth" <sebastian.hesselbarth@gmail.com>
Subject: Re: [PATCH 1/2] clk: mvebu: set flags in CP110 gate clock
Date: Tue, 30 Aug 2016 15:34:03 +0200 [thread overview]
Message-ID: <CAPv3WKfqGgFicSr-SF03_KXswWoFXtJOoY9DHDASOF9fGnZjpg@mail.gmail.com> (raw)
In-Reply-To: <20160830151010.0f85dfd7@free-electrons.com>
Hi Thomas,
2016-08-30 15:10 GMT+02:00 Thomas Petazzoni
<thomas.petazzoni@free-electrons.com>:
> Hello,
>
> On Tue, 23 Aug 2016 08:26:48 +0200, Marcin Wojtas wrote:
>
>> diff --git a/drivers/clk/mvebu/cp110-system-controller.c b/drivers/clk/mvebu/cp110-system-controller.c
>> index 7fa42d6..0835e1d 100644
>> --- a/drivers/clk/mvebu/cp110-system-controller.c
>> +++ b/drivers/clk/mvebu/cp110-system-controller.c
>> @@ -144,6 +144,7 @@ static struct clk *cp110_register_gate(const char *name,
>>
>> init.name = name;
>> init.ops = &cp110_gate_ops;
>> + init.flags = CLK_IS_BASIC;
>
> Is this really correct?
>
> The documentation for CLK_IS_BASIC is pretty slim, but it says:
>
> #define CLK_IS_BASIC BIT(5) /* Basic clk, can't do a to_clk_foo() */
>
> However, we *do* have a to_clk_*() macro in this driver:
>
> struct cp110_gate_clk {
> struct clk_hw hw;
> struct regmap *regmap;
> u8 bit_idx;
> };
>
> #define to_cp110_gate_clk(clk) container_of(clk, struct cp110_gate_clk, hw)
>
> If you read the commit log of commit
> f7d8caadfd2813cbada82ce9041b13c38e8e5282, which introduced the flag, it
> says:
>
> clk: Add CLK_IS_BASIC flag to identify basic clocks
>
> Most platforms end up using a mix of basic clock types and
> some which use clk_hw_foo struct for filling in custom platform
> information when the clocks don't fit into basic types supported.
>
> In platform code, its useful to know if a clock is using a basic
> type or clk_hw_foo, which helps platforms know if they can
> safely use to_clk_hw_foo to derive the clk_hw_foo pointer from
> clk_hw.
>
> Mark all basic clocks with a CLK_IS_BASIC flag.
>
> Signed-off-by: Rajendra Nayak <rnayak@ti.com>
> Signed-off-by: Mike Turquette <mturquette@linaro.org>
>
> We are in the case where we have our own clk_hw_foo structure, and a
> to_clk_hw_foo macro to derive the clk_hw_foo from clk_hw.
>
> According to this, the CP110 clocks are *not* basic clocks, and
> therefore we shouldn't have this flag. Perhaps just the memset() is
> missing.
>
I agree, from functional point of view and considering also not exact
fit to CLK_IS_BASIC definition, memset should be sufficient.
Best regards,
Marcin
next prev parent reply other threads:[~2016-08-30 13:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-23 6:26 [PATCH 0/2] Armada 7k/8k CP110 system controller fixes Marcin Wojtas
2016-08-23 6:26 ` [PATCH 1/2] clk: mvebu: set flags in CP110 gate clock Marcin Wojtas
2016-08-23 14:16 ` Andrew Lunn
2016-08-24 8:28 ` Marcin Wojtas
2016-08-25 0:13 ` Stephen Boyd
2016-08-30 13:10 ` Thomas Petazzoni
2016-08-30 13:34 ` Marcin Wojtas [this message]
2016-08-23 6:26 ` [PATCH 2/2] clk: mvebu: dynamically allocate resources in Armada CP110 system controller Marcin Wojtas
2016-08-25 0:16 ` Stephen Boyd
2016-08-30 15:31 ` Marcin Wojtas
2016-08-30 18:43 ` Stephen Boyd
2016-08-30 14:15 ` Thomas Petazzoni
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