linux-kernel - Re: [PATCH v3 5/7] clk: rockchip: add new pll-type for rk3399 and similar socs

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Message-ID: <56E0E92E.7000206@rock-chips.com>
Date:	Thu, 10 Mar 2016 11:25:34 +0800
From:	Xing Zheng <zhengxing@...k-chips.com>
To:	Heiko Stübner <heiko@...ech.de>
Cc:	mturquette@...libre.com, sboyd@...eaurora.org,
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, huangtao@...k-chips.com,
	jay.xu@...k-chips.com, elaine.zhang@...k-chips.com,
	dianders@...omium.org
Subject: Re: [PATCH v3 5/7] clk: rockchip: add new pll-type for rk3399 and
 similar socs

Hi Heiko,

On 2016年03月09日 20:29, Heiko Stübner wrote:
> Hi Xing,
>
> Am Mittwoch, 9. März 2016, 10:42:58 schrieb Xing Zheng:
>> The rk3399's pll and clock are similar with rk3036's, it different
>> with base on the rk3066(rk3188, rk3288, rk3368 use it), there are
>> different adjust foctors and control registers, so these should be
>> independent and separate from the series of rk3066s.
>>
>> Signed-off-by: Xing Zheng <zhengxing@...k-chips.com>
>> ---
>>
>> Changes in v3: None
>> Changes in v2: None
>>
>>   drivers/clk/rockchip/clk-pll.c |  279
>> +++++++++++++++++++++++++++++++++++++++- drivers/clk/rockchip/clk.h     |
>>   3 +-
>>   2 files changed, 280 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c
>> index 27be66a..62d2f0e 100644
>> --- a/drivers/clk/rockchip/clk-pll.c
>> +++ b/drivers/clk/rockchip/clk-pll.c
>> @@ -593,6 +593,275 @@ static const struct clk_ops
>> rockchip_rk3066_pll_clk_ops = { .init = rockchip_rk3066_pll_init,
>>   };
>>
>> +/**
>> + * PLL used in RK3399
>> + */
>> +
>> +#define RK3399_PLLCON(i)			(i * 0x4)
>> +#define RK3399_PLLCON0_FBDIV_MASK		0xfff
>> +#define RK3399_PLLCON0_FBDIV_SHIFT		0
>> +#define RK3399_PLLCON1_REFDIV_MASK		0x3f
>> +#define RK3399_PLLCON1_REFDIV_SHIFT		0
>> +#define RK3399_PLLCON1_POSTDIV1_MASK		0x7
>> +#define RK3399_PLLCON1_POSTDIV1_SHIFT		8
>> +#define RK3399_PLLCON1_POSTDIV2_MASK		0x7
>> +#define RK3399_PLLCON1_POSTDIV2_SHIFT		12
>> +#define RK3399_PLLCON2_FRAC_MASK		0xffffff
>> +#define RK3399_PLLCON2_FRAC_SHIFT		0
> please move RK3399_PLLCON2_LOCK_STATUS here
Done.
>> +#define RK3399_PLLCON3_DSMPD_MASK		0x1
>> +#define RK3399_PLLCON3_DSMPD_SHIFT		12
> DSMPD_SHIFT should be 3, right?
Yes, I'm sorry to careless.
>
>> +
>> +#define RK3399_PLLCON2_LOCK_STATUS		(31 << 0)
> that is wrong, you want (1 << 31), or even better BIT(31) here
Yes, done.
>
>> +#define RK3399_PLLCON3_PWRDOWN			(1 << 0)
> dito, BIT(0) please
Done.
>> +static int rockchip_rk3399_pll_set_rate(struct clk_hw *hw, unsigned long
>> drate, +					unsigned long prate)
>> +{
>> +	struct rockchip_clk_pll *pll = to_rockchip_clk_pll(hw);
>> +	const struct rockchip_pll_rate_table *rate;
>> +	unsigned long old_rate = rockchip_rk3399_pll_recalc_rate(hw, prate);
>> +	struct regmap *grf = rockchip_clk_get_grf(pll->ctx);
>> +
>> +	if (IS_ERR(grf)) {
>> +		pr_debug("%s: grf regmap not available, aborting rate change\n",
>> +			 __func__);
>> +		return PTR_ERR(grf);
>> +	}
> the pll lock-status moved to the pll registers it seems, so you don't need to
> get the GRF here at all, as we don't need it for the lock status.
Yes, done.

Thanks.

-- 
- Xing Zheng