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Mon, 18 Aug 2025 02:49:16 -0700 (PDT) Received: from ketchup (unknown [117.171.67.207]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) (Authenticated sender: heylenay@4d2.org) by bayard.4d2.org (Postfix) with ESMTPSA id 58EE012FB42D; Mon, 18 Aug 2025 02:49:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=4d2.org; s=mail; t=1755510556; bh=G/TSilIIny419+wjwN/t2gGm9Hi+eIHM7DbXOJEDR/Q=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=0jyHjaznbZLTd5hBz72tL6eH29OiPyRhhDBoTFL3eIAEJ3iQWDz+kx7mlDgQV1CK0 fIKTsi2ba5WbwjqD2gSVID+zmaJPLOvl8kN0JPeZjXlO9LAFeWOdDnIi0zzoRBG3/5 1SrbHlFceI7LpiroCT+jH1hLANLpY5ikQSWZooUN8PMmHChGOYKKRx3Vqv+CUyZ7St wY3f+TlRA5n7yf1EQcn7d0mNllzO4GwrdMF0Z9PT+JEk3uNDM/mtvvLGZlE9wcC4uO bPmcoKppUWojRn4/jnajtjgm+Ke1aVGMUrDTMdT6Kbikk1E9ixtpc7VKPtjoS7X8gc TyOe8sQjx1VFA== Date: Mon, 18 Aug 2025 09:49:10 +0000 From: Haylen Chu To: Troy Mitchell , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Yixun Lan , Alex Elder , Inochi Amaoto Cc: linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, linux-kernel@vger.kernel.org, Jinmei Wei Subject: Re: [PATCH v3 2/3] clk: spacemit: introduce pre-div for ddn clock Message-ID: References: <20250818-k1-clk-i2s-generation-v3-0-8139b22ae709@linux.spacemit.com> <20250818-k1-clk-i2s-generation-v3-2-8139b22ae709@linux.spacemit.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20250818-k1-clk-i2s-generation-v3-2-8139b22ae709@linux.spacemit.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250818_024919_771444_EEE6D155 X-CRM114-Status: GOOD ( 19.02 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Mon, Aug 18, 2025 at 05:28:21PM +0800, Troy Mitchell wrote: > The original DDN operations applied an implicit divide-by-2, which should > not be a default behavior. > > This patch removes that assumption, letting each clock define its > actual behavior explicitly. > > Signed-off-by: Troy Mitchell > --- > drivers/clk/spacemit/ccu-k1.c | 4 ++-- > drivers/clk/spacemit/ccu_ddn.c | 12 ++++++------ > drivers/clk/spacemit/ccu_ddn.h | 6 ++++-- > 3 files changed, 12 insertions(+), 10 deletions(-) Reviewed-by: Haylen Chu > diff --git a/drivers/clk/spacemit/ccu-k1.c b/drivers/clk/spacemit/ccu-k1.c > index 65e6de030717afa60eefab7bda88f9a13b857650..7155824673fb450971439873b6b6163faf48c7e5 100644 > --- a/drivers/clk/spacemit/ccu-k1.c > +++ b/drivers/clk/spacemit/ccu-k1.c > @@ -136,8 +136,8 @@ CCU_GATE_DEFINE(pll1_d3_819p2, CCU_PARENT_HW(pll1_d3), MPMU_ACGR, BIT(14), 0); > CCU_GATE_DEFINE(pll1_d2_1228p8, CCU_PARENT_HW(pll1_d2), MPMU_ACGR, BIT(16), 0); > > CCU_GATE_DEFINE(slow_uart, CCU_PARENT_NAME(osc), MPMU_ACGR, BIT(1), CLK_IGNORE_UNUSED); > -CCU_DDN_DEFINE(slow_uart1_14p74, pll1_d16_153p6, MPMU_SUCCR, 16, 13, 0, 13, 0); > -CCU_DDN_DEFINE(slow_uart2_48, pll1_d4_614p4, MPMU_SUCCR_1, 16, 13, 0, 13, 0); > +CCU_DDN_DEFINE(slow_uart1_14p74, pll1_d16_153p6, MPMU_SUCCR, 16, 13, 0, 13, 2, 0); > +CCU_DDN_DEFINE(slow_uart2_48, pll1_d4_614p4, MPMU_SUCCR_1, 16, 13, 0, 13, 2, 0); > > CCU_GATE_DEFINE(wdt_clk, CCU_PARENT_HW(pll1_d96_25p6), MPMU_WDTPCR, BIT(1), 0); > > diff --git a/drivers/clk/spacemit/ccu_ddn.c b/drivers/clk/spacemit/ccu_ddn.c > index be311b045698e95a688a35858a8ac1bcfbffd2c7..06d86748182bd1959cdab5c18d0a882ee25dcade 100644 > --- a/drivers/clk/spacemit/ccu_ddn.c > +++ b/drivers/clk/spacemit/ccu_ddn.c > @@ -22,21 +22,21 @@ > > #include "ccu_ddn.h" > > -static unsigned long ccu_ddn_calc_rate(unsigned long prate, > - unsigned long num, unsigned long den) > +static unsigned long ccu_ddn_calc_rate(unsigned long prate, unsigned long num, > + unsigned long den, unsigned int pre_div) > { > - return prate * den / 2 / num; > + return prate * den / pre_div / num; > } > > static unsigned long ccu_ddn_calc_best_rate(struct ccu_ddn *ddn, > unsigned long rate, unsigned long prate, > unsigned long *num, unsigned long *den) > { > - rational_best_approximation(rate, prate / 2, > + rational_best_approximation(rate, prate / ddn->pre_div, > ddn->den_mask >> ddn->den_shift, > ddn->num_mask >> ddn->num_shift, > den, num); > - return ccu_ddn_calc_rate(prate, *num, *den); > + return ccu_ddn_calc_rate(prate, *num, *den, ddn->pre_div); > } > > static long ccu_ddn_round_rate(struct clk_hw *hw, unsigned long rate, > @@ -58,7 +58,7 @@ static unsigned long ccu_ddn_recalc_rate(struct clk_hw *hw, unsigned long prate) > num = (val & ddn->num_mask) >> ddn->num_shift; > den = (val & ddn->den_mask) >> ddn->den_shift; > > - return ccu_ddn_calc_rate(prate, num, den); > + return ccu_ddn_calc_rate(prate, num, den, ddn->pre_div); > } > > static int ccu_ddn_set_rate(struct clk_hw *hw, unsigned long rate, > diff --git a/drivers/clk/spacemit/ccu_ddn.h b/drivers/clk/spacemit/ccu_ddn.h > index a52fabe77d62eba16426867a9c13481e72f025c0..4838414a8e8dc04af49d3b8d39280efedbd75616 100644 > --- a/drivers/clk/spacemit/ccu_ddn.h > +++ b/drivers/clk/spacemit/ccu_ddn.h > @@ -18,13 +18,14 @@ struct ccu_ddn { > unsigned int num_shift; > unsigned int den_mask; > unsigned int den_shift; > + unsigned int pre_div; > }; > > #define CCU_DDN_INIT(_name, _parent, _flags) \ > CLK_HW_INIT_HW(#_name, &_parent.common.hw, &spacemit_ccu_ddn_ops, _flags) > > #define CCU_DDN_DEFINE(_name, _parent, _reg_ctrl, _num_shift, _num_width, \ > - _den_shift, _den_width, _flags) \ > + _den_shift, _den_width, _pre_div, _flags) \ > static struct ccu_ddn _name = { \ > .common = { \ > .reg_ctrl = _reg_ctrl, \ > @@ -33,7 +34,8 @@ static struct ccu_ddn _name = { \ > .num_mask = GENMASK(_num_shift + _num_width - 1, _num_shift), \ > .num_shift = _num_shift, \ > .den_mask = GENMASK(_den_shift + _den_width - 1, _den_shift), \ > - .den_shift = _den_shift, \ > + .den_shift = _den_shift, \ > + .pre_div = _pre_div, \ > } > > static inline struct ccu_ddn *hw_to_ccu_ddn(struct clk_hw *hw) > > -- > 2.50.1 > _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv