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Date: Wed, 25 Jun 2014 16:19:17 +0200
From: Krzysztof Kozlowski <k.kozlowski@...sung.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>,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 05/14] clk: Add generic driver for Maxim PMIC clocks
On czw, 2014-06-19 at 20:20 +0200, Javier Martinez Canillas wrote:
> Maxim Integrated Power Management ICs are very similar with
> regard to their clock outputs. Most of the clock drivers for
> these chips are duplicating code and are simpler enough that
> can be converted to use a generic driver to consolidate code
> and avoid duplication.
>
> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
(...)
> diff --git a/drivers/clk/clk-max-gen.c b/drivers/clk/clk-max-gen.c
> new file mode 100644
> index 0000000..aa9ebbe
> --- /dev/null
> +++ b/drivers/clk/clk-max-gen.c
> @@ -0,0 +1,197 @@
> +/*
> + * clk-max-gen.c - Generic clock driver for Maxim PMICs clocks
> + *
> + * Copyright (C) 2012 Samsung Electornics
> + * Jonghwa Lee <jonghwa3.lee@...sung.com>
You copied this from original file but '2012' and author look a little
strange since this piece of work is actually new stuff. Maybe consider
adding current copyright?
> + *
> + * 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.
> + *
> + * This driver is based on clk-max77686.c
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +#include <linux/regmap.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk-provider.h>
> +#include <linux/mutex.h>
> +#include <linux/clkdev.h>
> +
> +struct max_gen_clk {
> + struct regmap *regmap;
> + u32 mask;
> + u32 reg;
> + struct clk_hw hw;
> + struct clk_lookup *lookup;
> +};
> +
> +static struct max_gen_clk *to_max_gen_clk(struct clk_hw *hw)
> +{
> + return container_of(hw, struct max_gen_clk, hw);
> +}
> +
> +static int max_gen_clk_prepare(struct clk_hw *hw)
> +{
> + struct max_gen_clk *max_gen = to_max_gen_clk(hw);
> +
> + return regmap_update_bits(max_gen->regmap, max_gen->reg,
> + max_gen->mask, max_gen->mask);
> +}
> +
> +static void max_gen_clk_unprepare(struct clk_hw *hw)
> +{
> + struct max_gen_clk *max_gen = to_max_gen_clk(hw);
> +
> + regmap_update_bits(max_gen->regmap, max_gen->reg,
> + max_gen->mask, ~max_gen->mask);
> +}
> +
> +static int max_gen_clk_is_prepared(struct clk_hw *hw)
> +{
> + struct max_gen_clk *max_gen = to_max_gen_clk(hw);
> + int ret;
> + u32 val;
> +
> + ret = regmap_read(max_gen->regmap, max_gen->reg, &val);
> +
> + if (ret < 0)
> + return -EINVAL;
> +
> + return val & max_gen->mask;
> +}
> +
> +static unsigned long max_gen_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + return 32768;
> +}
> +
> +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,
> +};
> +
> +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] = devm_kzalloc(dev, sizeof(struct max_gen_clk),
> + GFP_KERNEL);
> + if (!max_gen_clks[i])
> + return -ENOMEM;
> + }
Why don't use only one devm_kzalloc() call for struct max_gen_clk?
Something like:
max_gen_clks = devm_kzalloc(dev, sizeof(struct max_gen_clk)
* num_init, GFP_KERNEL);
This will be shorter and still readable.
> +
> + 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;
> +}
Since users of this function may be compiled as modules these should be
exported (EXPORT_SYMBOL(_GPL)):
ERROR: "max_gen_clk_ops" [drivers/clk/clk-max77802.ko] undefined!
ERROR: "max_gen_clk_probe" [drivers/clk/clk-max77802.ko] undefined!
ERROR: "max_gen_clk_remove" [drivers/clk/clk-max77802.ko] undefined!
ERROR: "max_gen_clk_ops" [drivers/clk/clk-max77686.ko] undefined!
ERROR: "max_gen_clk_probe" [drivers/clk/clk-max77686.ko] undefined!
ERROR: "max_gen_clk_remove" [drivers/clk/clk-max77686.ko] undefined!
Best regards,
Krzysztof
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