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Date: Mon, 7 May 2018 21:44:48 +0000
From: "Deucher, Alexander" <Alexander.Deucher@....com>
To: "Agrawal, Akshu" <Akshu.Agrawal@....com>
CC: "djkurtz@...omium.org" <djkurtz@...omium.org>,
"mturquette@...libre.com" <mturquette@...libre.com>,
"sboyd@...nel.org" <sboyd@...nel.org>,
"Koenig, Christian" <Christian.Koenig@....com>,
"airlied@...hat.com" <airlied@...hat.com>,
"Liu, Shaoyun" <Shaoyun.Liu@....com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
"rjw@...ysocki.net" <rjw@...ysocki.net>,
"lenb@...nel.org" <lenb@...nel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: RE: [PATCH v4 1/2] clk: x86: Add ST oscout platform clock
> -----Original Message-----
> From: Agrawal, Akshu
> Sent: Monday, May 7, 2018 6:14 AM
> Cc: djkurtz@...omium.org; Agrawal, Akshu <Akshu.Agrawal@....com>;
> Deucher, Alexander <Alexander.Deucher@....com>;
> mturquette@...libre.com; sboyd@...nel.org; Koenig, Christian
> <Christian.Koenig@....com>; airlied@...hat.com; Liu, Shaoyun
> <Shaoyun.Liu@....com>; linux-kernel@...r.kernel.org; linux-
> clk@...r.kernel.org; rjw@...ysocki.net; lenb@...nel.org; linux-
> acpi@...r.kernel.org
> Subject: [PATCH v4 1/2] clk: x86: Add ST oscout platform clock
>
> Stoney SoC provides oscout clock. This clock can support 25Mhz and 48Mhz
> of frequency.
> The clock is available for general system use.
>
> Signed-off-by: Akshu Agrawal <akshu.agrawal@....com>
> ---
> v2: config change, added SPDX tag and used clk_hw_register_.
> v3: Fix kbuild warning for checking of NULL pointer
> v4: unregister clk_hw in driver remove, add .suppress_bind_attrs
> drivers/clk/x86/Makefile | 3 +-
> drivers/clk/x86/clk-st.c | 85
> ++++++++++++++++++++++++++++++++++++
> include/linux/platform_data/clk-st.h | 17 ++++++++
> 3 files changed, 104 insertions(+), 1 deletion(-) create mode 100644
> drivers/clk/x86/clk-st.c create mode 100644
> include/linux/platform_data/clk-st.h
>
> diff --git a/drivers/clk/x86/Makefile b/drivers/clk/x86/Makefile index
> 1367afb..00303bc 100644
> --- a/drivers/clk/x86/Makefile
> +++ b/drivers/clk/x86/Makefile
> @@ -1,3 +1,4 @@
> +obj-$(CONFIG_PMC_ATOM) += clk-pmc-atom.o
> +obj-$(CONFIG_X86_AMD_PLATFORM_DEVICE) += clk-st.o
> clk-x86-lpss-objs := clk-lpt.o
> obj-$(CONFIG_X86_INTEL_LPSS) += clk-x86-lpss.o
> -obj-$(CONFIG_PMC_ATOM) += clk-pmc-atom.o
> diff --git a/drivers/clk/x86/clk-st.c b/drivers/clk/x86/clk-st.c new file mode
> 100644 index 0000000..8a7795c
> --- /dev/null
> +++ b/drivers/clk/x86/clk-st.c
> @@ -0,0 +1,85 @@
> +// SPDX-License-Identifier: GPL-2.0
Should this be MIT? The original license was MIT.
Alex
> +/*
> + * clock framework for AMD Stoney based clocks
> + *
> + * Copyright 2018 Advanced Micro Devices, Inc.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/platform_data/clk-st.h> #include
> +<linux/platform_device.h>
> +
> +/* Clock Driving Strength 2 register */
> +#define CLKDRVSTR2 0x28
> +/* Clock Control 1 register */
> +#define MISCCLKCNTL1 0x40
> +/* Auxiliary clock1 enable bit */
> +#define OSCCLKENB 2
> +/* 25Mhz auxiliary output clock freq bit */
> +#define OSCOUT1CLK25MHZ 16
> +
> +#define ST_CLK_48M 0
> +#define ST_CLK_25M 1
> +#define ST_CLK_MUX 2
> +#define ST_CLK_GATE 3
> +#define ST_MAX_CLKS 4
> +
> +static const char * const clk_oscout1_parents[] = { "clk48MHz",
> +"clk25MHz" };
> +
> +static int st_clk_probe(struct platform_device *pdev) {
> + struct st_clk_data *st_data;
> + struct clk_hw **hws;
> +
> + st_data = dev_get_platdata(&pdev->dev);
> + if (!st_data || !st_data->base)
> + return -EINVAL;
> +
> + hws = devm_kzalloc(&pdev->dev, sizeof(*hws) * ST_MAX_CLKS,
> GFP_KERNEL);
> + if (!hws)
> + return -ENOMEM;
> +
> + hws[ST_CLK_48M] = clk_hw_register_fixed_rate(NULL, "clk48MHz",
> NULL, 0,
> + 48000000);
> + hws[ST_CLK_25M] = clk_hw_register_fixed_rate(NULL, "clk25MHz",
> NULL, 0,
> + 25000000);
> +
> + hws[ST_CLK_MUX] = clk_hw_register_mux(NULL, "oscout1_mux",
> + clk_oscout1_parents, ARRAY_SIZE(clk_oscout1_parents),
> + 0, st_data->base + CLKDRVSTR2, OSCOUT1CLK25MHZ, 3, 0,
> NULL);
> +
> + clk_set_parent(hws[ST_CLK_MUX]->clk, hws[ST_CLK_25M]->clk);
> +
> + hws[ST_CLK_GATE] = clk_hw_register_gate(NULL, "oscout1",
> "oscout1_mux",
> + 0, st_data->base + MISCCLKCNTL1, OSCCLKENB,
> + CLK_GATE_SET_TO_DISABLE, NULL);
> +
> + clk_hw_register_clkdev(hws[ST_CLK_GATE], "oscout1", NULL);
> +
> + platform_set_drvdata(pdev, hws);
> + return 0;
> +}
> +
> +static int st_clk_remove(struct platform_device *pdev) {
> + struct clk_hw **hws;
> + int i;
> +
> + hws = platform_get_drvdata(pdev);
> +
> + for (i = 0; i < ST_MAX_CLKS; i++)
> + clk_hw_unregister(hws[i]);
> + return 0;
> +}
> +
> +static struct platform_driver st_clk_driver = {
> + .driver = {
> + .name = "clk-st",
> + .suppress_bind_attrs = true,
> + },
> + .probe = st_clk_probe,
> + .remove = st_clk_remove,
> +};
> +builtin_platform_driver(st_clk_driver);
> diff --git a/include/linux/platform_data/clk-st.h
> b/include/linux/platform_data/clk-st.h
> new file mode 100644
> index 0000000..188184d
> --- /dev/null
> +++ b/include/linux/platform_data/clk-st.h
> @@ -0,0 +1,17 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * clock framework for AMD Stoney based clock
> + *
> + * Copyright 2018 Advanced Micro Devices, Inc.
> + */
> +
> +#ifndef __CLK_ST_H
> +#define __CLK_ST_H
> +
> +#include <linux/compiler.h>
> +
> +struct st_clk_data {
> + void __iomem *base;
> +};
> +
> +#endif /* __CLK_ST_H */
> --
> 1.9.1
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