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Message-ID: <20170424093154.ffo7zsr66a2yjy74@dell>
Date: Mon, 24 Apr 2017 10:31:54 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: sboyd@...eaurora.org, mturquette@...libre.com,
xuwei5@...ilicon.com, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-clk@...r.kernel.org
Subject: Re: [PATCH V2] clk: hi6220: Add the hi655x's pmic clock
On Sat, 08 Apr 2017, Daniel Lezcano wrote:
> The hi655x multi function device is a PMIC providing regulators.
>
> The PMIC also provides a clock for the WiFi and the Bluetooth, let's implement
> this clock in order to add it in the hi655x MFD and allow proper wireless
> initialization.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>
> Changelog:
>
> V2:
> - Added COMPILE_TEST option, compiled on x86
> - Removed useless parenthesis
> - Used of_clk_hw_simple_get() instead of deref dance
> - Do bailout if the clock-names is not specified
> - Rollback on error
> - Folded mfd line change and binding
> - Added #clock-cells binding documentation
> - Added #clock-cells in the DT
>
> V1: initial post
> ---
??
> ---
I'm unsure if this as been mentioned before, but bundling;
driver & architecture changes and documentation into a single patch is
very seldom a good idea. In this case, you should split this into at
least 3, perhaps 4 patches.
> .../devicetree/bindings/mfd/hisilicon,hi655x.txt | 6 +
Patch 1
> arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts | 1 +
Patch 2
> drivers/clk/Kconfig | 8 ++
> drivers/clk/Makefile | 1 +
> drivers/clk/clk-hi655x.c | 140 +++++++++++++++++++++
Patch 3
> drivers/mfd/hi655x-pmic.c | 3 +-
Patch 4
[...]
> 6 files changed, 158 insertions(+), 1 deletion(-)
> create mode 100644 drivers/clk/clk-hi655x.c
>
> diff --git a/Documentation/devicetree/bindings/mfd/hisilicon,hi655x.txt b/Documentation/devicetree/bindings/mfd/hisilicon,hi655x.txt
> index 0548569..194e2a9fd 100644
> --- a/Documentation/devicetree/bindings/mfd/hisilicon,hi655x.txt
> +++ b/Documentation/devicetree/bindings/mfd/hisilicon,hi655x.txt
> @@ -16,6 +16,11 @@ Required properties:
> - reg: Base address of PMIC on Hi6220 SoC.
> - interrupt-controller: Hi655x has internal IRQs (has own IRQ domain).
> - pmic-gpios: The GPIO used by PMIC IRQ.
> +- #clock-cells: From common clock binding; shall be set to 0
> +
> +Optional properties:
> +- clock-output-names: From common clock binding to override the
> + default output clock name
>
> Example:
> pmic: pmic@...00000 {
> @@ -24,4 +29,5 @@ Example:
> interrupt-controller;
> #interrupt-cells = <2>;
> pmic-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
> + clock-cells = <0>;
> }
> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> index dba3c13..bb9afb1 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> +++ b/arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
> @@ -328,6 +328,7 @@
> interrupt-controller;
> #interrupt-cells = <2>;
> pmic-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
> + #clock-cells = <0>;
>
> regulators {
> ldo2: LDO2 {
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index 9356ab4..36cfea3 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -47,6 +47,14 @@ config COMMON_CLK_RK808
> clocked at 32KHz each. Clkout1 is always on, Clkout2 can off
> by control register.
>
> +config COMMON_CLK_HI655X
> + tristate "Clock driver for Hi655x"
> + depends on MFD_HI655X_PMIC || COMPILE_TEST
> + ---help---
> + This driver supports the hi655x PMIC clock. This
> + multi-function device has one fixed-rate oscillator, clocked
> + at 32KHz.
> +
> config COMMON_CLK_SCPI
> tristate "Clock driver controlled via SCPI interface"
> depends on ARM_SCPI_PROTOCOL || COMPILE_TEST
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index 92c12b8..c19983a 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_COMMON_CLK_PALMAS) += clk-palmas.o
> obj-$(CONFIG_COMMON_CLK_PWM) += clk-pwm.o
> obj-$(CONFIG_CLK_QORIQ) += clk-qoriq.o
> obj-$(CONFIG_COMMON_CLK_RK808) += clk-rk808.o
> +obj-$(CONFIG_COMMON_CLK_HI655X) += clk-hi655x.o
> obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o
> obj-$(CONFIG_COMMON_CLK_SCPI) += clk-scpi.o
> obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o
> diff --git a/drivers/clk/clk-hi655x.c b/drivers/clk/clk-hi655x.c
> new file mode 100644
> index 0000000..b2bea32
> --- /dev/null
> +++ b/drivers/clk/clk-hi655x.c
> @@ -0,0 +1,140 @@
> +/*
> + * Clock driver for Hi655x
> + *
> + * Copyright (c) 2016, Linaro Ltd.
> + *
> + * Author: Daniel Lezcano <daniel.lezcano@...aro.org>
> + *
> + * 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-provider.h>
> +#include <linux/clkdev.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/hi655x-pmic.h>
> +
> +#define HI655X_CLK_BASE HI655X_BUS_ADDR(0x1c)
> +#define HI655X_CLK_SET BIT(6)
> +
> +struct hi655x_clk {
> + struct hi655x_pmic *hi655x;
> + struct clk_hw clk_hw;
> +};
> +
> +static unsigned long hi655x_clk_recalc_rate(struct clk_hw *hw,
> + unsigned long parent_rate)
> +{
> + return 32768;
> +}
> +
> +static int hi655x_clk_enable(struct clk_hw *hw, bool enable)
> +{
> + struct hi655x_clk *hi655x_clk =
> + container_of(hw, struct hi655x_clk, clk_hw);
> +
> + struct hi655x_pmic *hi655x = hi655x_clk->hi655x;
> +
> + return regmap_update_bits(hi655x->regmap, HI655X_CLK_BASE,
> + HI655X_CLK_SET, enable ? HI655X_CLK_SET : 0);
> +}
> +
> +static int hi655x_clk_prepare(struct clk_hw *hw)
> +{
> + return hi655x_clk_enable(hw, true);
> +}
> +
> +static void hi655x_clk_unprepare(struct clk_hw *hw)
> +{
> + hi655x_clk_enable(hw, false);
> +}
> +
> +static int hi655x_clk_is_prepared(struct clk_hw *hw)
> +{
> + struct hi655x_clk *hi655x_clk =
> + container_of(hw, struct hi655x_clk, clk_hw);
> + struct hi655x_pmic *hi655x = hi655x_clk->hi655x;
> + int ret;
> + uint32_t val;
> +
> + ret = regmap_read(hi655x->regmap, HI655X_CLK_BASE, &val);
> + if (ret < 0)
> + return ret;
> +
> + return val & HI655X_CLK_BASE;
> +}
> +
> +static const struct clk_ops hi655x_clk_ops = {
> + .prepare = hi655x_clk_prepare,
> + .unprepare = hi655x_clk_unprepare,
> + .is_prepared = hi655x_clk_is_prepared,
> + .recalc_rate = hi655x_clk_recalc_rate,
> +};
> +
> +static int hi655x_clk_probe(struct platform_device *pdev)
> +{
> + struct device *parent = pdev->dev.parent;
> + struct hi655x_pmic *hi655x = dev_get_drvdata(parent);
> + struct clk_init_data *hi655x_clk_init;
> + struct hi655x_clk *hi655x_clk;
> + const char *clk_name = "hi655x-clk";
> + int ret;
> +
> + hi655x_clk = devm_kzalloc(&pdev->dev, sizeof(*hi655x_clk), GFP_KERNEL);
> + if (!hi655x_clk)
> + return -ENOMEM;
> +
> + hi655x_clk_init = devm_kzalloc(&pdev->dev, sizeof(*hi655x_clk_init),
> + GFP_KERNEL);
> + if (!hi655x_clk_init)
> + return -ENOMEM;
> +
> + of_property_read_string_index(parent->of_node, "clock-output-names",
> + 0, &clk_name);
> +
> + hi655x_clk_init->name = clk_name;
> + hi655x_clk_init->ops = &hi655x_clk_ops;
> +
> + hi655x_clk->clk_hw.init = hi655x_clk_init;
> + hi655x_clk->hi655x = hi655x;
> +
> + platform_set_drvdata(pdev, hi655x_clk);
> +
> + ret = devm_clk_hw_register(&pdev->dev, &hi655x_clk->clk_hw);
> + if (ret)
> + return ret;
> +
> + ret = of_clk_add_hw_provider(parent->of_node, of_clk_hw_simple_get,
> + &hi655x_clk->clk_hw);
> + if (ret)
> + return ret;
> +
> + ret = clk_hw_register_clkdev(&hi655x_clk->clk_hw, clk_name, NULL);
> + if (ret)
> + of_clk_del_provider(parent->of_node);
> +
> + return ret;
> +}
> +
> +static struct platform_driver hi655x_clk_driver = {
> + .probe = hi655x_clk_probe,
> + .driver = {
> + .name = "hi655x-clk",
> + },
> +};
> +
> +module_platform_driver(hi655x_clk_driver);
> +
> +MODULE_DESCRIPTION("Clk driver for the hi655x series PMICs");
> +MODULE_AUTHOR("Daniel Lezcano <daniel.lezcano@...aro.org>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:hi655x-clk");
> diff --git a/drivers/mfd/hi655x-pmic.c b/drivers/mfd/hi655x-pmic.c
> index ba706ad..c37ccbf 100644
> --- a/drivers/mfd/hi655x-pmic.c
> +++ b/drivers/mfd/hi655x-pmic.c
> @@ -77,7 +77,8 @@
> .num_resources = ARRAY_SIZE(pwrkey_resources),
> .resources = &pwrkey_resources[0],
> },
> - { .name = "hi655x-regulator", },
> + { .name = "hi655x-regulator", },
> + { .name = "hi655x-clk", },
> };
>
> static void hi655x_local_irq_clear(struct regmap *map)
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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