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[73.183.52.120]) by smtp.gmail.com with ESMTPSA id af79cd13be357-81b58b5d7fesm299937185a.8.2025.09.10.07.14.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Sep 2025 07:14:23 -0700 (PDT) Date: Wed, 10 Sep 2025 10:14:20 -0400 From: Brian Masney To: Ryan Chen Cc: Michael Turquette , Stephen Boyd , Philipp Zabel , Joel Stanley , Andrew Jeffery , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mo Elbadry , Rom Lemarchand , William Kennington , Yuxiao Zhang , wthai@nvidia.com, leohu@nvidia.com, dkodihalli@nvidia.com, spuranik@nvidia.com Subject: Re: [PATCH v12 3/3] clk: aspeed: add AST2700 clock driver Message-ID: References: <20250708052909.4145983-1-ryan_chen@aspeedtech.com> <20250708052909.4145983-4-ryan_chen@aspeedtech.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250708052909.4145983-4-ryan_chen@aspeedtech.com> User-Agent: Mutt/2.2.14 (2025-02-20) Hi Ryan, On Tue, Jul 08, 2025 at 01:29:09PM +0800, Ryan Chen wrote: > Add AST2700 clock controller driver and also use axiliary > device framework register the reset controller driver. > Due to clock and reset using the same register region. > > Signed-off-by: Ryan Chen I just have a few very minor style comments below. Otherwise the driver looks good to me. > +static struct clk_hw *ast2700_clk_hw_register_hpll(void __iomem *reg, > + const char *name, const char *parent_name, > + struct ast2700_clk_ctrl *clk_ctrl) > +{ > + unsigned int mult, div; > + u32 val; > + > + val = readl(clk_ctrl->base + SCU0_HWSTRAP1); > + if ((readl(clk_ctrl->base) & REVISION_ID) && (val & BIT(3))) { > + switch ((val & GENMASK(4, 2)) >> 2) { > + case 2: > + return devm_clk_hw_register_fixed_rate(clk_ctrl->dev, name, NULL, > + 0, 1800 * HZ_PER_MHZ); > + case 3: > + return devm_clk_hw_register_fixed_rate(clk_ctrl->dev, name, NULL, > + 0, 1700 * HZ_PER_MHZ); > + case 6: > + return devm_clk_hw_register_fixed_rate(clk_ctrl->dev, name, NULL, > + 0, 1200 * HZ_PER_MHZ); > + case 7: > + return devm_clk_hw_register_fixed_rate(clk_ctrl->dev, name, NULL, > + 0, 800 * HZ_PER_MHZ); > + default: > + return ERR_PTR(-EINVAL); > + } > + } else if ((val & GENMASK(3, 2)) != 0) { > + switch ((val & GENMASK(3, 2)) >> 2) { > + case 1: > + return devm_clk_hw_register_fixed_rate(clk_ctrl->dev, name, NULL, > + 0, 1900 * HZ_PER_MHZ); > + case 2: > + return devm_clk_hw_register_fixed_rate(clk_ctrl->dev, name, NULL, > + 0, 1800 * HZ_PER_MHZ); > + case 3: > + return devm_clk_hw_register_fixed_rate(clk_ctrl->dev, name, NULL, > + 0, 1700 * HZ_PER_MHZ); > + default: > + return ERR_PTR(-EINVAL); > + } > + } else { > + val = readl(reg); > + > + if (val & BIT(24)) { > + /* Pass through mode */ > + mult = 1; > + div = 1; > + } else { > + u32 m = val & 0x1fff; > + u32 n = (val >> 13) & 0x3f; > + u32 p = (val >> 19) & 0xf; > + > + mult = (m + 1) / (2 * (n + 1)); > + div = (p + 1); The ( ) is unnecessary here. > + } > + } > + > + return devm_clk_hw_register_fixed_factor(clk_ctrl->dev, name, parent_name, 0, mult, div); > +} > + > +static struct clk_hw *ast2700_clk_hw_register_pll(int clk_idx, void __iomem *reg, > + const char *name, const char *parent_name, > + struct ast2700_clk_ctrl *clk_ctrl) > +{ > + int scu = clk_ctrl->clk_data->scu; > + unsigned int mult, div; > + u32 val = readl(reg); > + > + if (val & BIT(24)) { > + /* Pass through mode */ > + mult = 1; > + div = 1; > + } else { > + u32 m = val & 0x1fff; > + u32 n = (val >> 13) & 0x3f; > + u32 p = (val >> 19) & 0xf; > + > + if (scu) { > + mult = (m + 1) / (n + 1); > + div = (p + 1); > + } else { > + if (clk_idx == SCU0_CLK_MPLL) { > + mult = m / (n + 1); > + div = (p + 1); > + } else { > + mult = (m + 1) / (2 * (n + 1)); > + div = (p + 1); The ( ) is unnecessary on div on the three places above. > +static void ast2700_soc1_configure_i3c_clk(struct ast2700_clk_ctrl *clk_ctrl) > +{ > + if (readl(clk_ctrl->base + SCU1_REVISION_ID) & REVISION_ID) > + /* I3C 250MHz = HPLL/4 */ > + writel((readl(clk_ctrl->base + SCU1_CLK_SEL2) & > + ~SCU1_CLK_I3C_DIV_MASK) | > + FIELD_PREP(SCU1_CLK_I3C_DIV_MASK, > + SCU1_CLK_I3C_DIV(4)), > + clk_ctrl->base + SCU1_CLK_SEL2); This block is hard to read. What do you think about this instead? if (readl(clk_ctrl->base + SCU1_REVISION_ID) & REVISION_ID) { u32 val; /* I3C 250MHz = HPLL/4 */ val = readl(clk_ctrl->base + SCU1_CLK_SEL2) & ~SCU1_CLK_I3C_DIV_MASK; val |= FIELD_PREP(SCU1_CLK_I3C_DIV_MASK, SCU1_CLK_I3C_DIV(4)); writel(val, clk_ctrl->base + SCU1_CLK_SEL2); } With those addressed: Reviewed-by: Brian Masney