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Message-ID: <023eb12a-902b-89f6-e1d5-066b86f42e65@canonical.com>
Date: Mon, 6 Dec 2021 09:13:56 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To: David Virag <virag.david003@...il.com>
Cc: Sam Protsenko <semen.protsenko@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Tomasz Figa <tomasz.figa@...il.com>,
Chanwoo Choi <cw00.choi@...sung.com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v3 4/7] clk: samsung: Make exynos850_register_cmu shared
On 06/12/2021 00:07, David Virag wrote:
> Rename exynos850_register_cmu to exynos_arm64_register_cmu and move it
> to a new file called "clk-exynos-arm64.c".
>
> This should have no functional changes, but it will allow this code to
> be shared between other arm64 Exynos SoCs, like the Exynos7885 and
> possibly ExynosAuto V9.
>
> Signed-off-by: David Virag <virag.david003@...il.com>
> ---
> Changes in v2:
> - New patch
>
> Changes in v3:
> - Fix SPDX comment style in clk-exynos-arm64.h
>
> drivers/clk/samsung/Makefile | 1 +
> drivers/clk/samsung/clk-exynos-arm64.c | 94 ++++++++++++++++++++++++++
> drivers/clk/samsung/clk-exynos-arm64.h | 20 ++++++
> drivers/clk/samsung/clk-exynos850.c | 94 ++------------------------
> 4 files changed, 119 insertions(+), 90 deletions(-)
> create mode 100644 drivers/clk/samsung/clk-exynos-arm64.c
> create mode 100644 drivers/clk/samsung/clk-exynos-arm64.h
>
> diff --git a/drivers/clk/samsung/Makefile b/drivers/clk/samsung/Makefile
> index c46cf11e4d0b..901e6333c5f0 100644
> --- a/drivers/clk/samsung/Makefile
> +++ b/drivers/clk/samsung/Makefile
> @@ -16,6 +16,7 @@ obj-$(CONFIG_EXYNOS_5420_COMMON_CLK) += clk-exynos5-subcmu.o
> obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK) += clk-exynos5433.o
> obj-$(CONFIG_EXYNOS_AUDSS_CLK_CON) += clk-exynos-audss.o
> obj-$(CONFIG_EXYNOS_CLKOUT) += clk-exynos-clkout.o
> +obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK) += clk-exynos-arm64.o
> obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK) += clk-exynos7.o
> obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK) += clk-exynos850.o
> obj-$(CONFIG_S3C2410_COMMON_CLK)+= clk-s3c2410.o
> diff --git a/drivers/clk/samsung/clk-exynos-arm64.c b/drivers/clk/samsung/clk-exynos-arm64.c
> new file mode 100644
> index 000000000000..b921b9a1134a
> --- /dev/null
> +++ b/drivers/clk/samsung/clk-exynos-arm64.c
> @@ -0,0 +1,94 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2021 Linaro Ltd.
> + * Copyright (C) 2021 Dávid Virág <virag.david003@...il.com>
> + * Author: Sam Protsenko <semen.protsenko@...aro.org>
> + * Author: Dávid Virág <virag.david003@...il.com>
> + *
> + * This file contains shared functions used by some arm64 Exynos SoCs,
> + * such as Exynos7885 or Exynos850 to register and init CMUs.
> + */
> +#include <linux/clk.h>
> +#include <linux/of_address.h>
> +
> +#include "clk-exynos-arm64.h"
> +
> +/* Gate register bits */
> +#define GATE_MANUAL BIT(20)
> +#define GATE_ENABLE_HWACG BIT(28)
> +
> +/* Gate register offsets range */
> +#define GATE_OFF_START 0x2000
> +#define GATE_OFF_END 0x2fff
> +
> +/**
> + * exynos_arm64_init_clocks - Set clocks initial configuration
> + * @np: CMU device tree node with "reg" property (CMU addr)
> + * @reg_offs: Register offsets array for clocks to init
> + * @reg_offs_len: Number of register offsets in reg_offs array
> + *
> + * Set manual control mode for all gate clocks.
> + */
> +static void __init exynos_arm64_init_clocks(struct device_node *np,
> + const unsigned long *reg_offs, size_t reg_offs_len)
> +{
> + void __iomem *reg_base;
> + size_t i;
> +
> + reg_base = of_iomap(np, 0);
> + if (!reg_base)
> + panic("%s: failed to map registers\n", __func__);
> +
> + for (i = 0; i < reg_offs_len; ++i) {
> + void __iomem *reg = reg_base + reg_offs[i];
> + u32 val;
> +
> + /* Modify only gate clock registers */
> + if (reg_offs[i] < GATE_OFF_START || reg_offs[i] > GATE_OFF_END)
> + continue;
> +
> + val = readl(reg);
> + val |= GATE_MANUAL;
> + val &= ~GATE_ENABLE_HWACG;
> + writel(val, reg);
> + }
> +
> + iounmap(reg_base);
> +}
> +
> +/**
> + * exynos_arm64_register_cmu - Register specified Exynos CMU domain
> + * @dev: Device object; may be NULL if this function is not being
> + * called from platform driver probe function
> + * @np: CMU device tree node
> + * @cmu: CMU data
> + *
> + * Register specified CMU domain, which includes next steps:
> + *
> + * 1. Enable parent clock of @cmu CMU
> + * 2. Set initial registers configuration for @cmu CMU clocks
> + * 3. Register @cmu CMU clocks using Samsung clock framework API
> + */
> +void __init exynos_arm64_register_cmu(struct device *dev,
> + struct device_node *np, const struct samsung_cmu_info *cmu)
> +{
> + /* Keep CMU parent clock running (needed for CMU registers access) */
> + if (cmu->clk_name) {
> + struct clk *parent_clk;
> +
> + if (dev)
> + parent_clk = clk_get(dev, cmu->clk_name);
> + else
> + parent_clk = of_clk_get_by_name(np, cmu->clk_name);
> +
> + if (IS_ERR(parent_clk)) {
> + pr_err("%s: could not find bus clock %s; err = %ld\n",
> + __func__, cmu->clk_name, PTR_ERR(parent_clk));
> + } else {
> + clk_prepare_enable(parent_clk);
> + }
> + }
> +
> + exynos_arm64_init_clocks(np, cmu->clk_regs, cmu->nr_clk_regs);
> + samsung_cmu_register_one(np, cmu);
> +}
> diff --git a/drivers/clk/samsung/clk-exynos-arm64.h b/drivers/clk/samsung/clk-exynos-arm64.h
> new file mode 100644
> index 000000000000..184ca79ea649
> --- /dev/null
> +++ b/drivers/clk/samsung/clk-exynos-arm64.h
> @@ -0,0 +1,20 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2021 Linaro Ltd.
> + * Copyright (C) 2021 Dávid Virág <virag.david003@...il.com>
> + * Author: Sam Protsenko <semen.protsenko@...aro.org>
> + * Author: Dávid Virág <virag.david003@...il.com>
> + *
> + * This file contains shared functions used by some arm64 Exynos SoCs,
> + * such as Exynos7885 or Exynos850 to register and init CMUs.
> + */
> +
> +#ifndef __SAMSUNG_CLK_ARM64_H
> +#define __SAMSUNG_CLK_ARM64_H
> +
> +#include "clk.h"
> +
> +void exynos_arm64_register_cmu(struct device *dev,
> + struct device_node *np, const struct samsung_cmu_info *cmu);
> +
> +#endif /* __CLK_EXYNOS_ARM64_H */
> diff --git a/drivers/clk/samsung/clk-exynos850.c b/drivers/clk/samsung/clk-exynos850.c
> index 568ac97c8120..3cc85b64cbff 100644
> --- a/drivers/clk/samsung/clk-exynos850.c
> +++ b/drivers/clk/samsung/clk-exynos850.c
> @@ -6,96 +6,10 @@
> * Common Clock Framework support for Exynos850 SoC.
> */
>
> -#include <linux/clk.h>
> -#include <linux/clk-provider.h>
> -#include <linux/of.h>
> -#include <linux/of_address.h>
> #include <linux/of_device.h>
> -#include <linux/platform_device.h>
I missed that part and gave review tag too fast. All headers which are
used here directly, should stay. You use here clk.h, clk-provider.h,
of.h, of_device.h and platform device, so all headers must stay.
Best regards,
Krzysztof
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