From: Jian Hu <jian.hu@amlogic•com>
To: Jerome Brunet <jbrunet@baylibre•com>,
Jian Hu via B4 Relay <devnull+jian.hu.amlogic.com@kernel•org>
Cc: Michael Turquette <mturquette@baylibre•com>,
Stephen Boyd <sboyd@kernel•org>, Rob Herring <robh@kernel•org>,
Krzysztof Kozlowski <krzk+dt@kernel•org>,
Conor Dooley <conor+dt@kernel•org>,
Neil Armstrong <neil.armstrong@linaro•org>,
Xianwei Zhao <xianwei.zhao@amlogic•com>,
Kevin Hilman <khilman@baylibre•com>,
Martin Blumenstingl <martin.blumenstingl@googlemail•com>,
linux-kernel@vger•kernel.org, linux-clk@vger•kernel.org,
devicetree@vger•kernel.org, linux-amlogic@lists•infradead.org,
linux-arm-kernel@lists•infradead.org
Subject: Re: [PATCH 05/10] clk: amlogic: PLL l_detect signal supports active-high configuration
Date: Wed, 20 May 2026 11:25:35 +0800 [thread overview]
Message-ID: <d023303e-e785-4b60-85cd-c83cc3f890e4@amlogic.com> (raw)
In-Reply-To: <1jse7u6n3q.fsf@starbuckisacylon.baylibre.com>
On 5/14/2026 11:13 PM, Jerome Brunet wrote:
> [ EXTERNAL EMAIL ]
>
> On lun. 11 mai 2026 at 20:47, Jian Hu via B4 Relay <devnull+jian.hu.amlogic.com@kernel•org> wrote:
>
>> From: Jian Hu <jian.hu@amlogic•com>
>>
>> l_detect controls the enable/disable of the PLL lock-detect module.
>>
>> For A9, the l_detect signal is active-high:
>> 0 -> Disable lock-detect module;
>> 1 -> Enable lock-detect module.
>>
>> Here, a flag CLK_MESON_PLL_L_DETECT_ACTIVE_HIGH is added to handle cases
>> like A9, where the signal is active-high.
>>
>> Signed-off-by: Jian Hu <jian.hu@amlogic•com>
>> ---
>> drivers/clk/meson/clk-pll.c | 9 +++++++--
>> drivers/clk/meson/clk-pll.h | 2 ++
>> 2 files changed, 9 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/clk/meson/clk-pll.c b/drivers/clk/meson/clk-pll.c
>> index 1ea6579a760f..5a0bd75f85a9 100644
>> --- a/drivers/clk/meson/clk-pll.c
>> +++ b/drivers/clk/meson/clk-pll.c
>> @@ -388,8 +388,13 @@ static int meson_clk_pll_enable(struct clk_hw *hw)
>> }
>>
>> if (MESON_PARM_APPLICABLE(&pll->l_detect)) {
>> - meson_parm_write(clk->map, &pll->l_detect, 1);
>> - meson_parm_write(clk->map, &pll->l_detect, 0);
>> + if (pll->flags & CLK_MESON_PLL_L_DETECT_ACTIVE_HIGH) {
>> + meson_parm_write(clk->map, &pll->l_detect, 0);
>> + meson_parm_write(clk->map, &pll->l_detect, 1);
>> + } else {
>> + meson_parm_write(clk->map, &pll->l_detect, 1);
>> + meson_parm_write(clk->map, &pll->l_detect, 0);
>> + }
> I'm not a fan of this code duplication.
> Use the introduced CLK_MESON_PLL_L_DETECT_ACTIVE_HIGH to compute the
> first value, then flip the bit.
Ok, I will update this in the next version.
Here is the updated code:
if (MESON_PARM_APPLICABLE(&pll->l_detect)) {
meson_parm_write(clk->map, &pll->l_detect,
!(pll->flags &
CLK_MESON_PLL_L_DETECT_ACTIVE_HIGH));
meson_parm_write(clk->map, &pll->l_detect,
!!(pll->flags &
CLK_MESON_PLL_L_DETECT_ACTIVE_HIGH));
}
>> }
>>
>> if (meson_clk_pll_wait_lock(hw))
>> diff --git a/drivers/clk/meson/clk-pll.h b/drivers/clk/meson/clk-pll.h
>> index 949157fb7bf5..97b7c70376a3 100644
>> --- a/drivers/clk/meson/clk-pll.h
>> +++ b/drivers/clk/meson/clk-pll.h
>> @@ -29,6 +29,8 @@ struct pll_mult_range {
>>
>> #define CLK_MESON_PLL_ROUND_CLOSEST BIT(0)
>> #define CLK_MESON_PLL_NOINIT_ENABLED BIT(1)
>> +/* l_detect signal is active-high */
>> +#define CLK_MESON_PLL_L_DETECT_ACTIVE_HIGH BIT(2)
>>
>> struct meson_clk_pll_data {
>> struct parm en;
> --
> Jerome
Best regards,
Jian
next prev parent reply other threads:[~2026-05-20 3:26 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-11 12:47 [PATCH 00/10] Add support for A9 family clock controller Jian Hu via B4 Relay
2026-05-11 12:47 ` [PATCH 01/10] dt-bindings: clock: Add Amlogic A9 SCMI " Jian Hu via B4 Relay
2026-05-11 12:47 ` [PATCH 02/10] dt-bindings: clock: Add Amlogic A9 PLL " Jian Hu via B4 Relay
2026-05-15 8:09 ` Krzysztof Kozlowski
2026-05-22 6:20 ` Jian Hu
2026-05-22 9:16 ` Krzysztof Kozlowski
2026-05-22 11:44 ` Jian Hu
2026-05-11 12:47 ` [PATCH 03/10] dt-bindings: clock: Add Amlogic A9 peripherals " Jian Hu via B4 Relay
2026-05-14 16:15 ` Jerome Brunet
2026-05-20 3:16 ` Jian Hu
2026-05-15 8:10 ` Krzysztof Kozlowski
2026-05-22 7:49 ` Jian Hu
2026-05-11 12:47 ` [PATCH 04/10] dt-bindings: clock: Add Amlogic A9 AO " Jian Hu via B4 Relay
2026-05-15 8:10 ` Krzysztof Kozlowski
2026-05-22 8:14 ` Jian Hu
2026-05-11 12:47 ` [PATCH 05/10] clk: amlogic: PLL l_detect signal supports active-high configuration Jian Hu via B4 Relay
2026-05-11 15:47 ` Brian Masney
2026-05-14 15:13 ` Jerome Brunet
2026-05-20 3:25 ` Jian Hu [this message]
2026-05-20 7:24 ` Jerome Brunet
2026-05-20 8:46 ` Jian Hu
2026-05-11 12:47 ` [PATCH 06/10] clk: amlogic: PLL reset signal supports active-low configuration Jian Hu via B4 Relay
2026-05-11 15:21 ` Brian Masney
2026-05-13 3:53 ` Jian Hu
2026-05-14 15:16 ` Jerome Brunet
2026-05-20 3:35 ` Jian Hu
2026-05-11 12:47 ` [PATCH 07/10] clk: amlogic: Support POWER_OF_TWO for PLL pre-divider Jian Hu via B4 Relay
2026-05-11 15:23 ` Brian Masney
2026-05-14 15:11 ` Jerome Brunet
2026-05-20 5:47 ` Jian Hu
2026-05-20 7:35 ` Jerome Brunet
2026-05-26 9:58 ` Jian Hu
2026-05-26 12:27 ` Jerome Brunet
2026-05-29 7:08 ` Jian Hu
2026-05-11 12:47 ` [PATCH 08/10] clk: amlogic: Add A9 PLL clock controller driver Jian Hu via B4 Relay
2026-05-11 15:36 ` Brian Masney
2026-05-13 7:25 ` Jian Hu
2026-05-14 16:12 ` Jerome Brunet
2026-05-20 7:33 ` Jian Hu
2026-05-11 12:47 ` [PATCH 09/10] clk: amlogic: Add A9 peripherals " Jian Hu via B4 Relay
2026-05-11 15:42 ` Brian Masney
2026-05-13 8:50 ` Jian Hu
2026-05-11 12:47 ` [PATCH 10/10] clk: amlogic: Add A9 AO " Jian Hu via B4 Relay
2026-05-11 15:45 ` Brian Masney
2026-05-13 9:19 ` Jian Hu
2026-05-14 16:27 ` Jerome Brunet
2026-05-20 7:37 ` Jian Hu
2026-05-26 7:33 ` [PATCH 00/10] Add support for A9 family clock controller Jerome Brunet
2026-05-26 10:05 ` Jian Hu
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