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Date: Tue, 26 Aug 2014 11:02:23 -0700
From: Doug Anderson <dianders@...omium.org>
To: Chris Zhong <zyw@...k-chips.com>
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 v6 4/5] clk: RK808: Add clkout driver for RK808
Chris,
On Tue, Aug 26, 2014 at 7:16 AM, Chris Zhong <zyw@...k-chips.com> wrote:
> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
>
> ---
>
> Changes in v6:
> Adviced by doug
> - use correct argument call of_clk_add_provider in probe
>
> Changes in v5:
> Adviced by doug
> - add some error checking in probe
> - move "rockchip,rk808.h" into the patch about dt-bindings
>
> Changes in v4:
> Adviced by doug
> - add "clock-output-names" propertiey
> - add a header file "rockchip,rk808.h"
>
> Changes in v3:
> - fix compile err
>
> Changes in v2:
> Adviced by javier.martinez
> - separated from rtc-rk808.
>
> drivers/clk/Kconfig | 9 +++
> drivers/clk/Makefile | 1 +
> drivers/clk/clk-rk808.c | 163 +++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 173 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..21f8b54
> --- /dev/null
> +++ b/drivers/clk/clk-rk808.c
> @@ -0,0 +1,163 @@
> +/*
> + * Clkout driver for Rockchip RK808
> + *
> + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
> + *
> + * Author: Chris Zhong <zyw@...k-chips.com>
I probably would have removed "Author" here (like in other patches)
since it's below in MODULE_AUTHOR. ...but I'm not a huge stickler for
it.
> + *
> + * 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);
nit: I'd pass "true" instead of 1. I should have noticed earlier.
> +}
> +
> +static void rk808_clkout2_unprepare(struct clk_hw *hw)
> +{
> + rk808_clkout2_control(hw, 0);
nit: I'd pass "false" instead of 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);
nit: space around "*".
> + 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,
> + &rk808_clkout->clk_data);
> +}
> +
> +static struct platform_driver rk808_clkout_driver = {
> + .probe = rk808_clkout_probe,
> + .driver = {
> + .name = "rk808-clkout",
> + .owner = THIS_MODULE,
nit: you could remove "THIS_MODULE" as Lee suggested in another patch.
> + },
> +};
> +
> +module_platform_driver(rk808_clkout_driver);
> +
> +MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
> +MODULE_AUTHOR("Chris Zhong <zyw@...k-chips.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:rk808-clkout");
Nothing above is really important and I've tested that this driver
works both as a clock source for clocks on rk3288 and for use by clock
clients, so feel free to add my:
Reviewed-by: Doug Anderson <dianders@...omium.org>
Tested-by: Doug Anderson <dianders@...omium.org>
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