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[73.183.52.120]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-720b475d63asm18667696d6.48.2025.09.02.14.49.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Sep 2025 14:49:19 -0700 (PDT) Date: Tue, 2 Sep 2025 17:49:17 -0400 From: Brian Masney To: Peng Fan Cc: Michael Turquette , Stephen Boyd , Sudeep Holla , Cristian Marussi , Marco Felsch , Dan Carpenter , Geert Uytterhoeven , linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 2/3] clk: conf: Support assigned-clock-sscs Message-ID: References: <20250901-clk-ssc-version1-v2-0-1d0a486dffe6@nxp.com> <20250901-clk-ssc-version1-v2-2-1d0a486dffe6@nxp.com> Precedence: bulk X-Mailing-List: arm-scmi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <20250901-clk-ssc-version1-v2-2-1d0a486dffe6@nxp.com> User-Agent: Mutt/2.2.14 (2025-02-20) X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 8GIbMunr_mYbhPVxC6bS8CCnpsHN59p4fhrVP9YbgCY_1756849761 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Mon, Sep 01, 2025 at 11:51:46AM +0800, Peng Fan wrote: > Parse the Spread Spectrum Configuration(SSC) from device tree and configure > them before using the clock. > > Each SSC is three u32 elements which means ' modmethod>', so assigned-clock-sscs is an array of multiple three u32 > elements. > > Signed-off-by: Peng Fan > --- > drivers/clk/clk-conf.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 69 insertions(+) > > diff --git a/drivers/clk/clk-conf.c b/drivers/clk/clk-conf.c > index 303a0bb26e54a95655ce094a35b989c97ebc6fd8..dd6083597db3f8f27d86abf5640dfc3fb39a9b88 100644 > --- a/drivers/clk/clk-conf.c > +++ b/drivers/clk/clk-conf.c > @@ -155,6 +155,71 @@ static int __set_clk_rates(struct device_node *node, bool clk_supplier) > return 0; > } > > +static int __set_clk_spread_spectrum(struct device_node *node, bool clk_supplier) > +{ > + struct clk_spread_spectrum *sscs __free(kfree) = NULL; > + u32 elem_size = sizeof(struct clk_spread_spectrum); > + struct of_phandle_args clkspec; > + int rc, count, index; > + struct clk *clk; > + > + /* modfreq, spreadPercent, modmethod */ > + count = of_property_count_elems_of_size(node, "assigned-clock-sscs", elem_size); > + if (count <= 0) > + return 0; > + > + sscs = kcalloc(count, elem_size, GFP_KERNEL); > + if (!sscs) > + return -ENOMEM; > + > + rc = of_property_read_u32_array(node, "assigned-clock-sscs", (u32 *)sscs, > + count * 3); > + if (rc) > + return rc; > + > + for (index = 0; index < count; index++) { > + struct clk_spread_spectrum *conf = &sscs[index]; > + struct clk_hw *hw; > + > + if (!conf->modfreq_hz && !conf->spread_bp && !conf->method) > + continue; > + > + rc = of_parse_phandle_with_args(node, "assigned-clocks", "#clock-cells", > + index, &clkspec); > + if (rc < 0) { > + /* skip empty (null) phandles */ > + if (rc == -ENOENT) > + continue; > + else > + return rc; > + } > + > + if (clkspec.np == node && !clk_supplier) { > + of_node_put(clkspec.np); > + return 0; > + } > + > + clk = of_clk_get_from_provider(&clkspec); > + of_node_put(clkspec.np); > + if (IS_ERR(clk)) { > + if (PTR_ERR(clk) != -EPROBE_DEFER) > + pr_warn("clk: couldn't get clock %d for %pOF\n", > + index, node); > + return PTR_ERR(clk); This chunk can be replaced with dev_warn_probe(). Sorry I missed that in v1. Otherwise the rest looks good to me. With that fixed: Reviewed-by: Brian Masney