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Date: Tue, 26 Aug 2014 09:12:15 +0800
From: Chris Zhong <zyw@...k-chips.com>
To: Doug Anderson <dianders@...omium.org>
CC: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Lee Jones <lee.jones@...aro.org>,
Liam Girdwood <lgirdwood@...il.com>,
"broonie@...nel.org" <broonie@...nel.org>,
Alessandro Zummo <a.zummo@...ertech.it>,
Mike Turquette <mturquette@...aro.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
rtc-linux@...glegroups.com, Grant Likely <grant.likely@...aro.org>,
Lin Huang <hl@...k-chips.com>,
Tao Huang <huangtao@...k-chips.com>,
Eddie Cai <cf@...k-chips.com>,
zhangqing <zhangqing@...k-chips.com>, xxx <xxx@...k-chips.com>,
Heiko Stübner <heiko@...ech.de>,
Olof Johansson <olof@...om.net>,
Sonny Rao <sonnyrao@...omium.org>,
Dmitry Torokhov <dtor@...omium.org>,
Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
Kever Yang <kever.yang@...k-chips.com>
Subject: Re: [PATCH v5 5/5] clk: RK808: Add clkout driver for RK808
On 08/26/2014 01:59 AM, Doug Anderson wrote:
> Chris,
>
> On Mon, Aug 25, 2014 at 6:39 AM, Chris Zhong <zyw@...k-chips.com> wrote:
>> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
>>
>> ---
>>
>> Changes in v5:
>> Advices by Mark Brown
>> - add description about regulator valid name.
>> - add a header file "rockchip,rk808".
>>
>> Changes in v4:
>> Advices by Doug
>> - add a "#clock-cells" propertiy
>> - update the example
>>
>> Changes in v3: None
>> Changes in v2: None
>>
>> drivers/clk/Kconfig | 9 +++
>> drivers/clk/Makefile | 1 +
>> drivers/clk/clk-rk808.c | 164 +++++++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 174 insertions(+)
>> create mode 100644 drivers/clk/clk-rk808.c
>>
>> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
>> index cfd3af7..84e0590 100644
>> --- a/drivers/clk/Kconfig
>> +++ b/drivers/clk/Kconfig
>> @@ -38,6 +38,15 @@ config COMMON_CLK_MAX77686
>> ---help---
>> This driver supports Maxim 77686 crystal oscillator clock.
>>
>> +config COMMON_CLK_RK808
>> + tristate "Clock driver for RK808"
>> + depends on MFD_RK808
>> + ---help---
>> + This driver supports RK808 crystal oscillator clock. These
>> + multi-function devices have two fixed-rate oscillators,
>> + clocked at 32KHz each. Clkout1 is always on, Clkout2 can off
>> + by control register.
>> +
>> config COMMON_CLK_SI5351
>> tristate "Clock driver for SiLabs 5351A/B/C"
>> depends on I2C
>> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
>> index f537a0b..99f53d5 100644
>> --- a/drivers/clk/Makefile
>> +++ b/drivers/clk/Makefile
>> @@ -28,6 +28,7 @@ obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o
>> obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o
>> obj-$(CONFIG_COMMON_CLK_PALMAS) += clk-palmas.o
>> obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o
>> +obj-$(CONFIG_COMMON_CLK_RK808) += clk-rk808.o
>> obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o
>> obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o
>> obj-$(CONFIG_COMMON_CLK_SI570) += clk-si570.o
>> diff --git a/drivers/clk/clk-rk808.c b/drivers/clk/clk-rk808.c
>> new file mode 100644
>> index 0000000..a8f8d81
>> --- /dev/null
>> +++ b/drivers/clk/clk-rk808.c
>> @@ -0,0 +1,164 @@
>> +/*
>> + * Clkout driver for Rockchip RK808
>> + *
>> + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
>> + *
>> + * Author: Chris Zhong <zyw@...k-chips.com>
>> + * Author: Zhang Qing <zhangqing@...k-chips.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms and conditions of the GNU General Public License,
>> + * version 2, as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope 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.
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/module.h>
>> +#include <linux/slab.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/mfd/rk808.h>
>> +#include <linux/i2c.h>
>> +
>> +struct rk808_clkout {
>> + struct rk808 *rk808;
>> + struct clk_onecell_data clk_data;
>> + struct clk_hw clkout1_hw;
>> + struct clk_hw clkout2_hw;
>> +};
>> +
>> +static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
>> + unsigned long parent_rate)
>> +{
>> + return 32768;
>> +}
>> +
>> +static int rk808_clkout1_is_prepared(struct clk_hw *hw)
>> +{
>> + return 1;
>> +}
>> +
>> +static int rk808_clkout2_control(struct clk_hw *hw, bool enable)
>> +{
>> + struct rk808_clkout *rk808_clkout = container_of(hw,
>> + struct rk808_clkout,
>> + clkout2_hw);
>> + struct rk808 *rk808 = rk808_clkout->rk808;
>> +
>> + return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
>> + CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
>> +}
>> +
>> +static int rk808_clkout2_prepare(struct clk_hw *hw)
>> +{
>> + return rk808_clkout2_control(hw, 1);
>> +}
>> +
>> +static void rk808_clkout2_unprepare(struct clk_hw *hw)
>> +{
>> + rk808_clkout2_control(hw, 0);
>> +}
>> +
>> +static int rk808_clkout2_is_prepared(struct clk_hw *hw)
>> +{
>> + struct rk808_clkout *rk808_clkout = container_of(hw,
>> + struct rk808_clkout,
>> + clkout2_hw);
>> + struct rk808 *rk808 = rk808_clkout->rk808;
>> + uint32_t val;
>> +
>> + int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
>> +
>> + if (ret < 0)
>> + return ret;
>> +
>> + return (val & CLK32KOUT2_EN) ? 1 : 0;
>> +}
>> +
>> +static const struct clk_ops rk808_clkout1_ops = {
>> + .is_prepared = rk808_clkout1_is_prepared,
>> + .recalc_rate = rk808_clkout_recalc_rate,
>> +};
>> +
>> +static const struct clk_ops rk808_clkout2_ops = {
>> + .prepare = rk808_clkout2_prepare,
>> + .unprepare = rk808_clkout2_unprepare,
>> + .is_prepared = rk808_clkout2_is_prepared,
>> + .recalc_rate = rk808_clkout_recalc_rate,
>> +};
>> +
>> +static int rk808_clkout_probe(struct platform_device *pdev)
>> +{
>> + struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
>> + struct i2c_client *client = rk808->i2c;
>> + struct device_node *node = client->dev.of_node;
>> + struct clk_init_data init = {};
>> + struct clk **clk_table;
>> + struct rk808_clkout *rk808_clkout;
>> +
>> + rk808_clkout = devm_kzalloc(&client->dev,
>> + sizeof(*rk808_clkout), GFP_KERNEL);
>> + if (!rk808_clkout)
>> + return -ENOMEM;
>> +
>> + rk808_clkout->rk808 = rk808;
>> +
>> + clk_table = devm_kzalloc(&client->dev,
>> + 2*sizeof(struct clk *), GFP_KERNEL);
>> + if (!clk_table)
>> + return -ENOMEM;
>> +
>> + init.flags = CLK_IS_ROOT;
>> + init.parent_names = NULL;
>> + init.num_parents = 0;
>> + init.name = "rk808-clkout1";
>> + init.ops = &rk808_clkout1_ops;
>> + rk808_clkout->clkout1_hw.init = &init;
>> +
>> + /* optional override of the clockname */
>> + of_property_read_string_index(node, "clock-output-names",
>> + 0, &init.name);
>> +
>> + clk_table[0] = devm_clk_register(&client->dev,
>> + &rk808_clkout->clkout1_hw);
>> + if (IS_ERR(clk_table[0]))
>> + return PTR_ERR(clk_table[0]);
>> +
>> + init.name = "rk808-clkout2";
>> + init.ops = &rk808_clkout2_ops;
>> + rk808_clkout->clkout2_hw.init = &init;
>> +
>> + /* optional override of the clockname */
>> + of_property_read_string_index(node, "clock-output-names",
>> + 1, &init.name);
>> +
>> + clk_table[1] = devm_clk_register(&client->dev,
>> + &rk808_clkout->clkout2_hw);
>> + if (IS_ERR(clk_table[1]))
>> + return PTR_ERR(clk_table[1]);
>> +
>> + rk808_clkout->clk_data.clks = clk_table;
>> + rk808_clkout->clk_data.clk_num = 2;
>> +
>> + return of_clk_add_provider(node, of_clk_src_onecell_get, clk_table);
> I'm about 99.9% certain that the above line should be:
>
> return of_clk_add_provider(node, of_clk_src_onecell_get,
> &rk808_clkout->clk_data);
>
> The data for of_clk_src_onecell_get() should be of type "struct
> clk_onecell_data *".
>
>
> Otherwise this looks good to me and you can add my Reviewed-by tag
> (and even my Tested-by tag).
>
> -Doug
Yes, It should be, TKS.
I will modify it in v6
>
>
>
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