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Date: Mon, 4 Jul 2022 14:14:12 +0200
From: Robert Marko <robimarko@...il.com>
To: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Andy Gross <agross@...nel.org>,
Jassi Brar <jassisinghbrar@...il.com>,
Rob Herring <robh+dt@...nel.org>,
krzysztof.kozlowski+dt@...aro.org,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
linux-arm-msm <linux-arm-msm@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
Devicetree List <devicetree@...r.kernel.org>,
linux-clk@...r.kernel.org, Ansuel Smith <ansuelsmth@...il.com>
Subject: Re: [PATCH v4 3/6] clk: qcom: Add IPQ8074 APSS clock controller
On Fri, 1 Jul 2022 at 01:03, Bjorn Andersson <bjorn.andersson@...aro.org> wrote:
>
> On Sun 15 May 15:45 CDT 2022, Robert Marko wrote:
>
> > IPQ8074 APSS clock controller provides the clock for the IPQ8074 CPU
> > cores, thus also providing support for CPU frequency scaling.
> >
> > It looks like they are clocked by the XO and a custom APSS type PLL.
> >
> > Co-developed-by: Ansuel Smith <ansuelsmth@...il.com>
> > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > Signed-off-by: Robert Marko <robimarko@...il.com>
> > ---
> > Changes in v2:
> > * Convert to using parent-data instead of parent-names
> > ---
> > drivers/clk/qcom/Kconfig | 11 +++
> > drivers/clk/qcom/Makefile | 1 +
> > drivers/clk/qcom/apss-ipq8074.c | 170 ++++++++++++++++++++++++++++++++
> > 3 files changed, 182 insertions(+)
> > create mode 100644 drivers/clk/qcom/apss-ipq8074.c
> >
> > diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
> > index 00fe5f066de5..9494eb74374a 100644
> > --- a/drivers/clk/qcom/Kconfig
> > +++ b/drivers/clk/qcom/Kconfig
> > @@ -134,6 +134,17 @@ config IPQ_APSS_6018
> > Say Y if you want to support CPU frequency scaling on
> > ipq based devices.
> >
> > +config IPQ_APSS_8074
> > + tristate "IPQ8074 APSS Clock Controller"
> > + select IPQ_GCC_8074
> > + depends on QCOM_APCS_IPC || COMPILE_TEST
> > + help
> > + Support for APSS clock controller on IPQ8074 platforms. The
> > + APSS clock controller manages the Mux and enable block that feeds the
> > + CPUs.
> > + Say Y if you want to support CPU frequency scaling on
> > + IPQ8074 based devices.
> > +
> > config IPQ_GCC_4019
> > tristate "IPQ4019 Global Clock Controller"
> > help
> > diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
> > index 671cf5821af1..7b2da6dd570c 100644
> > --- a/drivers/clk/qcom/Makefile
> > +++ b/drivers/clk/qcom/Makefile
> > @@ -22,6 +22,7 @@ obj-$(CONFIG_APQ_MMCC_8084) += mmcc-apq8084.o
> > obj-$(CONFIG_CLK_GFM_LPASS_SM8250) += lpass-gfm-sm8250.o
> > obj-$(CONFIG_IPQ_APSS_PLL) += apss-ipq-pll.o
> > obj-$(CONFIG_IPQ_APSS_6018) += apss-ipq6018.o
> > +obj-$(CONFIG_IPQ_APSS_8074) += apss-ipq8074.o
> > obj-$(CONFIG_IPQ_GCC_4019) += gcc-ipq4019.o
> > obj-$(CONFIG_IPQ_GCC_6018) += gcc-ipq6018.o
> > obj-$(CONFIG_IPQ_GCC_806X) += gcc-ipq806x.o
> > diff --git a/drivers/clk/qcom/apss-ipq8074.c b/drivers/clk/qcom/apss-ipq8074.c
> > new file mode 100644
> > index 000000000000..38d03cd0ff76
> > --- /dev/null
> > +++ b/drivers/clk/qcom/apss-ipq8074.c
> > @@ -0,0 +1,170 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2022, The Linux Foundation. All rights reserved.
> > + */
> > +
> > +#include <linux/clk-provider.h>
> > +#include <linux/err.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +
> > +#include <dt-bindings/clock/qcom,apss-ipq8074.h>
> > +
> > +#include "common.h"
> > +#include "clk-regmap.h"
> > +#include "clk-pll.h"
> > +#include "clk-rcg.h"
> > +#include "clk-branch.h"
> > +#include "clk-alpha-pll.h"
> > +#include "clk-regmap-divider.h"
> > +#include "clk-regmap-mux.h"
> > +
> > +#define F(f, s, h, m, n) { (f), (s), (2 * (h) - 1), (m), (n) }
> > +
> > +enum {
> > + P_XO,
> > + P_GPLL0,
> > + P_GPLL2,
> > + P_GPLL4,
> > + P_APSS_PLL_EARLY,
> > + P_APSS_PLL
> > +};
> > +
> > +static struct clk_alpha_pll apss_pll_early = {
> > + .offset = 0x5000,
> > + .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_APSS],
> > + .clkr = {
> > + .enable_reg = 0x5000,
> > + .enable_mask = BIT(0),
> > + .hw.init = &(struct clk_init_data){
> > + .name = "apss_pll_early",
> > + .parent_data = &(const struct clk_parent_data) {
> > + .fw_name = "xo", .name = "xo"
> > + },
> > + .num_parents = 1,
> > + .ops = &clk_alpha_pll_huayra_ops,
> > + },
> > + },
> > +};
> > +
> > +static struct clk_alpha_pll_postdiv apss_pll = {
> > + .offset = 0x5000,
> > + .regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_APSS],
> > + .width = 2,
> > + .clkr.hw.init = &(struct clk_init_data){
> > + .name = "apss_pll",
> > + .parent_hws = (const struct clk_hw *[]){
> > + &apss_pll_early.clkr.hw },
> > + .num_parents = 1,
> > + .ops = &clk_alpha_pll_postdiv_ro_ops,
> > + },
> > +};
> > +
> > +static const struct clk_parent_data parents_apcs_alias0_clk_src[] = {
> > + { .fw_name = "xo", .name = "xo" },
> > + { .fw_name = "gpll0", .name = "gpll0" },
> > + { .fw_name = "gpll2", .name = "gpll2" },
> > + { .fw_name = "gpll4", .name = "gpll4" },
> > + { .hw = &apss_pll.clkr.hw },
> > + { .hw = &apss_pll_early.clkr.hw },
> > +};
> > +
> > +static const struct parent_map parents_apcs_alias0_clk_src_map[] = {
> > + { P_XO, 0 },
> > + { P_GPLL0, 4 },
> > + { P_GPLL2, 2 },
> > + { P_GPLL4, 1 },
> > + { P_APSS_PLL, 3 },
> > + { P_APSS_PLL_EARLY, 5 },
> > +};
> > +
> > +struct freq_tbl ftbl_apcs_alias0_clk_src[] = {
> > + F(19200000, P_XO, 1, 0, 0),
> > + F(403200000, P_APSS_PLL_EARLY, 1, 0, 0),
> > + F(806400000, P_APSS_PLL_EARLY, 1, 0, 0),
> > + F(1017600000, P_APSS_PLL_EARLY, 1, 0, 0),
> > + F(1382400000, P_APSS_PLL_EARLY, 1, 0, 0),
> > + F(1651200000, P_APSS_PLL_EARLY, 1, 0, 0),
> > + F(1843200000, P_APSS_PLL_EARLY, 1, 0, 0),
> > + F(1920000000, P_APSS_PLL_EARLY, 1, 0, 0),
> > + F(2208000000UL, P_APSS_PLL_EARLY, 1, 0, 0),
> > + { }
> > +};
> > +
> > +struct clk_rcg2 apcs_alias0_clk_src = {
> > + .cmd_rcgr = 0x0050,
> > + .freq_tbl = ftbl_apcs_alias0_clk_src,
> > + .hid_width = 5,
> > + .parent_map = parents_apcs_alias0_clk_src_map,
> > + .clkr.hw.init = &(struct clk_init_data){
> > + .name = "apcs_alias0_clk_src",
> > + .parent_data = parents_apcs_alias0_clk_src,
> > + .num_parents = ARRAY_SIZE(parents_apcs_alias0_clk_src),
> > + .ops = &clk_rcg2_ops,
> > + .flags = CLK_SET_RATE_PARENT,
> > + },
> > +};
> > +
> > +static struct clk_branch apcs_alias0_core_clk = {
> > + .halt_reg = 0x0058,
> > + .halt_bit = 31,
> > + .clkr = {
> > + .enable_reg = 0x0058,
> > + .enable_mask = BIT(0),
> > + .hw.init = &(struct clk_init_data){
> > + .name = "apcs_alias0_core_clk",
> > + .parent_hws = (const struct clk_hw *[]){
> > + &apcs_alias0_clk_src.clkr.hw },
> > + .num_parents = 1,
> > + .flags = CLK_SET_RATE_PARENT |
> > + CLK_IS_CRITICAL,
> > + .ops = &clk_branch2_ops,
> > + },
> > + },
> > +};
> > +
> > +static struct clk_regmap *apss_ipq8074_clks[] = {
> > + [APSS_PLL_EARLY] = &apss_pll_early.clkr,
> > + [APSS_PLL] = &apss_pll.clkr,
> > + [APCS_ALIAS0_CLK_SRC] = &apcs_alias0_clk_src.clkr,
> > + [APCS_ALIAS0_CORE_CLK] = &apcs_alias0_core_clk.clkr,
> > +};
> > +
> > +static const struct regmap_config apss_ipq8074_regmap_config = {
> > + .reg_bits = 32,
> > + .reg_stride = 4,
> > + .val_bits = 32,
> > + .max_register = 0x5ffc,
> > + .fast_io = true,
> > +};
> > +
> > +static const struct qcom_cc_desc apss_ipq8074_desc = {
> > + .config = &apss_ipq8074_regmap_config,
> > + .clks = apss_ipq8074_clks,
> > + .num_clks = ARRAY_SIZE(apss_ipq8074_clks),
> > +};
> > +
> > +static int apss_ipq8074_probe(struct platform_device *pdev)
> > +{
> > + struct regmap *regmap;
> > +
> > + regmap = dev_get_regmap(pdev->dev.parent, NULL);
> > + if (!regmap)
> > + return -ENODEV;
> > +
> > + return qcom_cc_really_probe(pdev, &apss_ipq8074_desc, regmap);
> > +}
> > +
> > +static struct platform_driver apss_ipq8074_driver = {
> > + .probe = apss_ipq8074_probe,
> > + .driver = {
> > + .name = "qcom,apss-ipq8074-clk",
>
> As pointed out by Krzysztof, this shouldn't have a ',' in there and if
> you look at msm8916 it uses "qcom-apcs-msm8916-clk", so please follow
> that.
Hi,
Sorry for the late reply.
Will fix it up in v5.
>
> I don't know if you intend to actually build this as a module, but if
> so, wouldn't you also need
> MODULE_ALIAS("platform:qcom-apss-ipq8074-clk"); to make module loading
> pick this thing up?
I never tried it as a module, however, there is nothing special here that would
require it to be boolean.
It works fine as a module, but like you stated MODULE_ALIAS is required so it
gets autoloaded, I will add it in v5.
Regards,
Robert
>
> Regards,
> Bjorn
>
> > + },
> > +};
> > +
> > +module_platform_driver(apss_ipq8074_driver);
> > +
> > +MODULE_DESCRIPTION("Qualcomm IPQ8074 APSS clock driver");
> > +MODULE_LICENSE("GPL");
> > --
> > 2.36.1
> >
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