| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <CAKew6eWt-0c4gxGX7C7KtRrxR=9h9BSUmN3a2aWQtuT40cva1w@mail.gmail.com>
Date: Thu, 26 Jun 2014 17:21:29 +0530
From: Yadwinder Singh Brar <yadi.brar01@...il.com>
To: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc: Lee Jones <lee.jones@...aro.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Mark Brown <broonie@...nel.org>,
Mike Turquette <mturquette@...aro.org>,
Liam Girdwood <lgirdwood@...il.com>,
Alessandro Zummo <a.zummo@...ertech.it>,
Kukjin Kim <kgene.kim@...sung.com>,
Doug Anderson <dianders@...omium.org>,
Olof Johansson <olof@...om.net>,
Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
Daniel Stone <daniels@...labora.com>,
Tomeu Vizoso <tomeu.vizoso@...labora.com>,
Krzysztof Kozlowski <k.kozlowski@...sung.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
devicetree <devicetree@...r.kernel.org>,
linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 05/14] clk: Add generic driver for Maxim PMIC clocks
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 <linux/types.h>
> +#include <linux/device.h>
> +#include <linux/clkdev.h>
> +#include <linux/regmap.h>
> +#include <linux/platform_device.h>
> +
> +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@...r.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@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists