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[209.132.180.67]) by mx.google.com with ESMTP id j9si2776389oii.195.2019.12.23.23.47.38; Mon, 23 Dec 2019 23:47:49 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b="JdfRkv/i"; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727047AbfLXHqm (ORCPT + 99 others); Tue, 24 Dec 2019 02:46:42 -0500 Received: from mail.kernel.org ([198.145.29.99]:37476 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726910AbfLXHqk (ORCPT ); Tue, 24 Dec 2019 02:46:40 -0500 Received: from kernel.org (unknown [104.132.0.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1589220706; Tue, 24 Dec 2019 07:46:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577173599; bh=1BJxrvDxsrR7VIQZMUVHbOxilZxPHKLhLbtnCYK0wCI=; h=In-Reply-To:References:Cc:From:To:Subject:Date:From; b=JdfRkv/iA1GPjKltY9g+b6rJwS1+cIxjN0vr48ttnpmYMEX8QPn5meFCchbWv1huh l5/CLVEWnsvGvfxUOH+WSJj1UElcjrFHTrpxVoM+UwvZIgbLRtqAKwkA5RoQzbHRTr W3VvVkpDVzCB4m2PWvDaoMi4Nd5r5ZrjumyhIS7s= Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable In-Reply-To: <20191209183511.3576038-11-daniel@zonque.org> References: <20191209183511.3576038-1-daniel@zonque.org> <20191209183511.3576038-11-daniel@zonque.org> Cc: mturquette@baylibre.com, robh+dt@kernel.org, broonie@kernel.org, lee.jones@linaro.org, lars@metafoo.de, pascal.huerst@gmail.com, Daniel Mack From: Stephen Boyd To: Daniel Mack , alsa-devel@alsa-project.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 09/10] clk: Add support for AD242x clock output providers User-Agent: alot/0.8.1 Date: Mon, 23 Dec 2019 23:46:38 -0800 Message-Id: <20191224074639.1589220706@mail.kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Quoting Daniel Mack (2019-12-09 10:35:10) > diff --git a/drivers/clk/clk-ad242x.c b/drivers/clk/clk-ad242x.c > new file mode 100644 > index 000000000000..201789d8f174 > --- /dev/null > +++ b/drivers/clk/clk-ad242x.c > @@ -0,0 +1,231 @@ > +// SPDX-License-Identifier: GPL-2.0 > + > +#include > +#include > +#include Is this include used? > +#include > +#include > +#include Is this include used? > +#include Any way we can avoid this build dependency? Maybe just put defines in this driver that deals with the clk bits of the device? > +#include > +#include > + > +#include > + > +#define AD242X_NUM_CLKS 2 > + > +struct ad242x_clk_hw { > + struct clk_hw hw; > + struct clk_init_data init; Do we need to keep around this init data after probe? I'd rather leave this out. > + struct ad242x_node *node; What's the point of this structure? Can we use dev->parent->regmap and just store the struct regmap pointer here instead of using this custom struct? > + u8 reg; > +}; > + > +struct ad242x_clk_driver_data { > + struct ad242x_clk_hw hw[AD242X_NUM_CLKS]; If this is the only drvdata, then I'd prefer just the array and not another struct so we can have clarity. > +}; > + > +static inline struct ad242x_clk_hw *to_ad242x_clk(struct clk_hw *hw) > +{ > + return container_of(hw, struct ad242x_clk_hw, hw); > +} > + [...] > + > +static long ad242x_clk_round_rate(struct clk_hw *hw, unsigned long rate, > + unsigned long *parent_rate) > +{ > + unsigned long pll_rate =3D *parent_rate * 2048UL; > + unsigned long prediv, div; > + > + if (rate > pll_rate / 4 || rate < pll_rate / 1024UL) > + return -EINVAL; This callback should round the rate to something valid. If the rate is larger than pll_rate / 4 then it should clamp to be the highest rate supported. Likewise for something slow. > + > + ad242x_do_div(rate, pll_rate, &prediv, &div); > + > + return pll_rate / (prediv * div); > +} > + [...] > + > +static struct clk_hw * > +ad242x_of_clk_get(struct of_phandle_args *clkspec, void *data) > +{ > + struct ad242x_clk_driver_data *drvdata =3D data; > + unsigned int idx =3D clkspec->args[0]; > + > + return &drvdata->hw[idx].hw; It looks quite a bit like of_clk_hw_onecell_get(). Can that be used? Or at least check for out of bounds and return failure? > +} > + > +static int ad242x_clk_probe(struct platform_device *pdev) > +{ > + const char *clk_names[AD242X_NUM_CLKS] =3D { "clkout1", "clkout2"= }; > + u8 regs[AD242X_NUM_CLKS] =3D { AD242X_CLK1CFG, AD242X_CLK2CFG }; > + struct ad242x_clk_driver_data *drvdata; > + struct device *dev =3D &pdev->dev; > + const char *sync_clk_name; > + struct ad242x_node *node; > + int i, ret; > + > + if (!dev->of_node) > + return -ENODEV; Please drop this. It's not useful. > + > + drvdata =3D devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); > + if (!drvdata) > + return -ENOMEM; > + > + node =3D dev_get_drvdata(dev->parent); Add a NULL check on node? > + sync_clk_name =3D ad242x_master_get_clk_name(node->master); > + > + for (i =3D 0; i < AD242X_NUM_CLKS; i++) { > + const char *name; > + > + if (of_property_read_string_index(dev->of_node, > + "clock-output-names", > + i, &name) =3D=3D 0) > + drvdata->hw[i].init.name =3D name; > + else > + drvdata->hw[i].init.name =3D clk_names[i]; Do you need unique names? Or can you generate psuedo unique names based on the device name and clk number? > + > + drvdata->hw[i].reg =3D regs[i]; > + drvdata->hw[i].init.ops =3D &ad242x_clk_ops; > + drvdata->hw[i].init.num_parents =3D 1; > + drvdata->hw[i].init.parent_names =3D &sync_clk_name; > + drvdata->hw[i].hw.init =3D &drvdata->hw[i].init; > + drvdata->hw[i].node =3D node; > + > + ret =3D devm_clk_hw_register(dev, &drvdata->hw[i].hw); > + if (ret < 0) > + return ret; > + } > + > + return devm_of_clk_add_hw_provider(dev, ad242x_of_clk_get, drvdat= a); > +}