From: Stephen Boyd <sboyd@codeaurora.org>
To: Heiko Stuebner <heiko@sntech.de>
Cc: Elaine Zhang <zhangqing@rock-chips.com>,
mturquette@baylibre.com, linux-clk@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org,
linux-arm-kernel@lists.infradead.org, huangtao@rock-chips.com,
cl@rock-chips.com, xxx@rock-chips.com, xf@rock-chips.com
Subject: Re: [PATCH 1/2] clk: fractional-divider: allow overriding of approximation
Date: Mon, 7 Aug 2017 16:02:30 -0700 [thread overview]
Message-ID: <20170807230230.GY2146@codeaurora.org> (raw)
In-Reply-To: <5453089.AIzWDZk3ey@phil>
On 08/01, Heiko Stuebner wrote:
> From: Elaine Zhang <zhangqing@rock-chips.com>
>
> Fractional dividers may have special requirements concerning numerator
> and denominator selection that differ from just getting the best
> approximation.
>
> For example on Rockchip socs the denominator must be at least 20 times
> larger than the numerator to generate precise clock frequencies.
>
> Therefore add the ability to provide custom approximation functions.
>
> Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
> ---
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
WARNING: multiple messages have this Message-ID (diff)
From: sboyd@codeaurora.org (Stephen Boyd)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] clk: fractional-divider: allow overriding of approximation
Date: Mon, 7 Aug 2017 16:02:30 -0700 [thread overview]
Message-ID: <20170807230230.GY2146@codeaurora.org> (raw)
In-Reply-To: <5453089.AIzWDZk3ey@phil>
On 08/01, Heiko Stuebner wrote:
> From: Elaine Zhang <zhangqing@rock-chips.com>
>
> Fractional dividers may have special requirements concerning numerator
> and denominator selection that differ from just getting the best
> approximation.
>
> For example on Rockchip socs the denominator must be at least 20 times
> larger than the numerator to generate precise clock frequencies.
>
> Therefore add the ability to provide custom approximation functions.
>
> Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
> ---
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2017-08-07 23:02 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-21 8:03 [PATCH v3] clk: fractional-divider: fix up the fractional clk's jitter Elaine Zhang
2017-07-21 8:03 ` Elaine Zhang
2017-08-01 16:19 ` Heiko Stuebner
2017-08-01 16:19 ` Heiko Stuebner
2017-08-01 16:19 ` Heiko Stuebner
2017-08-01 16:21 ` [PATCH 1/2] clk: fractional-divider: allow overriding of approximation Heiko Stuebner
2017-08-01 16:21 ` Heiko Stuebner
2017-08-01 16:21 ` Heiko Stuebner
2017-08-02 3:43 ` Elaine Zhang
2017-08-02 3:43 ` Elaine Zhang
2017-08-07 23:02 ` Stephen Boyd [this message]
2017-08-07 23:02 ` Stephen Boyd
2017-08-08 15:58 ` Heiko Stuebner
2017-08-08 15:58 ` Heiko Stuebner
2017-08-01 16:22 ` [PATCH 2/2] clk: rockchip: add special approximation to fix up fractional clk's jitter Heiko Stuebner
2017-08-01 16:22 ` Heiko Stuebner
2017-08-01 16:22 ` Heiko Stuebner
2017-08-02 3:43 ` Elaine Zhang
2017-08-02 3:43 ` Elaine Zhang
2017-08-08 15:58 ` Heiko Stuebner
2017-08-08 15:58 ` Heiko Stuebner
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