Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757222AbaFZLvd (ORCPT ); Thu, 26 Jun 2014 07:51:33 -0400 Received: from mail-ie0-f181.google.com ([209.85.223.181]:61493 "EHLO mail-ie0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756280AbaFZLva (ORCPT ); Thu, 26 Jun 2014 07:51:30 -0400 MIME-Version: 1.0 In-Reply-To: <1403723019-6212-6-git-send-email-javier.martinez@collabora.co.uk> References: <1403723019-6212-1-git-send-email-javier.martinez@collabora.co.uk> <1403723019-6212-6-git-send-email-javier.martinez@collabora.co.uk> Date: Thu, 26 Jun 2014 17:21:29 +0530 Message-ID: Subject: Re: [PATCH v4 05/14] clk: Add generic driver for Maxim PMIC clocks From: Yadwinder Singh Brar To: Javier Martinez Canillas Cc: Lee Jones , Samuel Ortiz , Mark Brown , Mike Turquette , Liam Girdwood , Alessandro Zummo , Kukjin Kim , Doug Anderson , Olof Johansson , Sjoerd Simons , Daniel Stone , Tomeu Vizoso , Krzysztof Kozlowski , "linux-arm-kernel@lists.infradead.org" , devicetree , linux-samsung-soc , linux-kernel Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Javier, Sorry for jumping in late, but just one concern mentioned inline. [ .. ] > + > +static unsigned long max_gen_recalc_rate(struct clk_hw *hw, > + unsigned long parent_rate) > +{ > + return 32768; > +} Isn't more safer(correct), if it check and return 0 when clk is disabled(unprepared) ? Regards, Yadwinder > + > +struct clk_ops max_gen_clk_ops = { > + .prepare = max_gen_clk_prepare, > + .unprepare = max_gen_clk_unprepare, > + .is_prepared = max_gen_clk_is_prepared, > + .recalc_rate = max_gen_recalc_rate, > +}; > +EXPORT_SYMBOL_GPL(max_gen_clk_ops); > + > +static struct clk *max_gen_clk_register(struct device *dev, > + struct max_gen_clk *max_gen) > +{ > + struct clk *clk; > + struct clk_hw *hw = &max_gen->hw; > + > + clk = clk_register(dev, hw); > + if (IS_ERR(clk)) > + return clk; > + > + max_gen->lookup = kzalloc(sizeof(struct clk_lookup), GFP_KERNEL); > + if (!max_gen->lookup) > + return ERR_PTR(-ENOMEM); > + > + max_gen->lookup->con_id = hw->init->name; > + max_gen->lookup->clk = clk; > + > + clkdev_add(max_gen->lookup); > + > + return clk; > +} > + > +int max_gen_clk_probe(struct platform_device *pdev, struct regmap *regmap, > + u32 reg, struct clk_init_data *clks_init, int num_init) > +{ > + int i, ret; > + struct max_gen_clk *max_gen_clks; > + struct clk **clocks; > + struct device *dev = &pdev->dev; > + > + clocks = devm_kzalloc(dev, sizeof(struct clk *) * num_init, GFP_KERNEL); > + if (!clocks) > + return -ENOMEM; > + > + max_gen_clks = devm_kzalloc(dev, sizeof(struct max_gen_clk) > + * num_init, GFP_KERNEL); > + if (!max_gen_clks) > + return -ENOMEM; > + > + for (i = 0; i < num_init; i++) { > + max_gen_clks[i].regmap = regmap; > + max_gen_clks[i].mask = 1 << i; > + max_gen_clks[i].reg = reg; > + max_gen_clks[i].hw.init = &clks_init[i]; > + > + clocks[i] = max_gen_clk_register(dev, &max_gen_clks[i]); > + if (IS_ERR(clocks[i])) { > + ret = PTR_ERR(clocks[i]); > + dev_err(dev, "failed to register %s\n", > + max_gen_clks[i].hw.init->name); > + goto err_clocks; > + } > + } > + > + platform_set_drvdata(pdev, clocks); > + > + if (dev->of_node) { > + struct clk_onecell_data *of_data; > + > + of_data = devm_kzalloc(dev, sizeof(*of_data), GFP_KERNEL); > + if (!of_data) { > + ret = -ENOMEM; > + goto err_clocks; > + } > + > + of_data->clks = clocks; > + of_data->clk_num = num_init; > + ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, > + of_data); > + > + if (ret) { > + dev_err(dev, "failed to register OF clock provider\n"); > + goto err_clocks; > + } > + } > + > + return 0; > + > +err_clocks: > + for (--i; i >= 0; --i) { > + clkdev_drop(max_gen_clks[i].lookup); > + clk_unregister(max_gen_clks[i].hw.clk); > + } > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(max_gen_clk_probe); > + > +int max_gen_clk_remove(struct platform_device *pdev, int num_init) > +{ > + struct clk **clocks = platform_get_drvdata(pdev); > + struct device *dev = pdev->dev.parent; > + int i; > + > + if (dev->of_node) > + of_clk_del_provider(dev->of_node); > + > + for (i = 0; i < num_init; i++) { > + struct clk_hw *hw = __clk_get_hw(clocks[i]); > + struct max_gen_clk *max_gen = to_max_gen_clk(hw); > + > + clkdev_drop(max_gen->lookup); > + clk_unregister(clocks[i]); > + } > + return 0; > +} > +EXPORT_SYMBOL_GPL(max_gen_clk_remove); > diff --git a/drivers/clk/clk-max-gen.h b/drivers/clk/clk-max-gen.h > new file mode 100644 > index 0000000..997e86f > --- /dev/null > +++ b/drivers/clk/clk-max-gen.h > @@ -0,0 +1,32 @@ > +/* > + * clk-max-gen.h - Generic clock driver for Maxim PMICs clocks > + * > + * Copyright (C) 2014 Google, Inc > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License as published by the > + * Free Software Foundation; either version 2 of the License, or (at your > + * option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + */ > + > +#ifndef __CLK_MAX_GEN_H__ > +#define __CLK_MAX_GEN_H__ > + > +#include > +#include > +#include > +#include > +#include > + > +int max_gen_clk_probe(struct platform_device *pdev, struct regmap *regmap, > + u32 reg, struct clk_init_data *clks_init, int num_init); > +int max_gen_clk_remove(struct platform_device *pdev, int num_init); > +extern struct clk_ops max_gen_clk_ops; > + > +#endif /* __CLK_MAX_GEN_H__ */ > -- > 2.0.0.rc2 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/