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Fri, 29 May 2020 12:49:51 +0000 (GMT) From: Marek Szyprowski To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Mark Brown , Dmitry Osipenko Cc: Marek Szyprowski , Liam Girdwood , Lucas Stach , Bartlomiej Zolnierkiewicz , Krzysztof Kozlowski , Viresh Kumar , peron.clem@gmail.com, Nishanth Menon , Stephen Boyd , Vincent Guittot , Rafael Wysocki , linux-samsung-soc@vger.kernel.org, Chanwoo Choi Subject: [PATCH 2/2] soc: samsung: Add simple voltage coupler for Exynos5800 Date: Fri, 29 May 2020 14:49:40 +0200 Message-Id: <20200529124940.10675-3-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200529124940.10675-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0VSaUhUURjlznvz5jk1+hyFuWlkDRQkuGXBbVGyBR6l0L9ESnvpQ821eWoq BGpRNlouYbmjIqRj7kvu5ahNYjouNSopppmaSxoumKbV+Mz+nfOdc+75+LgkJq0TmpG+gSGs IpDxlxNivObtT63VIt7rbtt+X4bKU0uFKGVsgkADy1NCVPTjC0BabZkIfc4aEqDVD7EC1F+f SaClx20ApWqbBai4bUSE5ta6BOhTdj+O3nf2CdGWrhxHsW2rGCpfoc8a03XpIyK6QvWIoId1 jQSdsGlLV318iNNPqlSA1gy+EtBLFQeukG7iM16sv28Yq7BxvCH2iZkdEgWPHwzf2mzBo4Da XAlIElLHYUaJsRKISSlVAKCuIwrjyTKAGSotzpMlAFM0ZQIlMNhOjFdqRXospV4AuBB9dzeR 1TAj1AsEZQeV80pCL5hS0QBW5/RspzFqA4NNvYf02IRyhoW5i4R+D5w6DNcHcP1YQjnA6aYK wJdZwKKyN5geG1COUNenBvo3IdUtgnE1aoI3XYCDzWNCHpvAGU2ViMf7YefTeJwP3ANwrLtY xJN4APtjUncqTsPh7vXtLTDqKCytt+HHTnB2uQvjj2QIB+eN+f0NYXLN852xBMY+kPLuIzBd U7Jb29LTt2Oh4USBmL9PEoB1KZOCRGCR/r8rBwAVkLGhXIA3y9kHsnesOSaACw30tvYMCqgA fz9U55ZmpRY0/7qpBhQJ5HslZWlad6mQCeMiAtQAkpjcVHKuq9NdKvFiIiJZRZCHItSf5dTA nMTlMol93rfrUsqbCWH9WDaYVfxTBaSBWRS4bTU86ddy0oWZbZL5vT5WHF2dpwvdsFSlcy/d XDamPBKNXDNGXBPyI8/bOL+7Gu0wmuaUHa+djEvbSlp5diu5dfqEYceer/ssHC6FR9Rubl4b X+vOdDqVP+fXKlsgzRSNFz080+h8o7GJwu/rbb8lMS7Ifm2UXsz1b69kSrGGy3Kc82HsLDEF x/wBdAECwUwDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprLIsWRmVeSWpSXmKPExsVy+t/xu7rvWS7GGczqsrDYOGM9q8XUh0/Y LK5/ec5qsfrjY0aL8+c3sFs8mHuTyeLblQ4mi8u75rBZfO49wmgx4/w+Jou1R+6yW7z5cZbJ 4va8yywWZ05fYrX4d20ji0XHkW/MFhu/ejgIeuycdZfdY9OqTjaPO9f2sHn0/zXw2HK1ncWj b8sqRo/jN7YzeXzeJBfAEaVnU5RfWpKqkJFfXGKrFG1oYaRnaGmhZ2RiqWdobB5rZWSqpG9n k5Kak1mWWqRvl6CX0fT6JnvBI4WKf38PsjQwHpLuYuTkkBAwkXi0+Tx7FyMXh5DAUkaJJR+a GSESMhInpzWwQtjCEn+udbFBFH1ilJi3+TczSIJNwFCi6y1EQkSglVHi/OtVTCAOs0Ari8SC O6vAqoQFfCRWLvwAVMXBwSKgKvHrOgtImFfAVuLF3k1Q2+QlVm84AFbOKWAnce3SIbC4EFDN gR1NTBMY+RYwMqxiFEktLc5Nzy020itOzC0uzUvXS87P3cQIjJptx35u2cHY9S74EKMAB6MS D++GmefjhFgTy4orcw8xSnAwK4nwOp09HSfEm5JYWZValB9fVJqTWnyI0RToponMUqLJ+cCI ziuJNzQ1NLewNDQ3Njc2s1AS5+0QOBgjJJCeWJKanZpakFoE08fEwSnVwKi+ffmPvh0B32Lt lQReWy1Su7iA7ca+Dt6Vzjo753hnab98PtNE3GiXzJlz3dLlCYZcW+vMflsHh8lMmvn/p+/1 a1+NJPIDX8yIPvZY9snZHxvK/16MPuO9i3U/Z+iprW8EWoxFn3z6LbTXJTHE/sUCjctyP/qv 6Md0TF78/LDkpTW/tG7K7mxRYinOSDTUYi4qTgQAn1kQdrACAAA= X-CMS-MailID: 20200529124952eucas1p2565c598c3c0164b5dec6ed83e19148b8 X-Msg-Generator: CA X-RootMTR: 20200529124952eucas1p2565c598c3c0164b5dec6ed83e19148b8 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200529124952eucas1p2565c598c3c0164b5dec6ed83e19148b8 References: <20200529124940.10675-1-m.szyprowski@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Add custom voltage regulator coupler for Exynos5800 SoCs, which require coupling between "vdd_arm" and "vdd_int" regulators. This coupler ensures that coupled regulators voltage balancing is done only when clients for each regulator (cpufreq for "vdd_arm" and devfreq for "vdd_int") apply their constraints, so the voltage values don't go beyond the bootloader-selected operation point during the boot process. This also ensures proper voltage balancing if any of those drivers is missing. Signed-off-by: Marek Szyprowski --- arch/arm/mach-exynos/Kconfig | 1 + drivers/soc/samsung/Kconfig | 3 + drivers/soc/samsung/Makefile | 1 + .../soc/samsung/exynos-regulator-coupler.c | 59 +++++++++++++++++++ 4 files changed, 64 insertions(+) create mode 100644 drivers/soc/samsung/exynos-regulator-coupler.c diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig index 76838255b5fa..f185cd3d4c62 100644 --- a/arch/arm/mach-exynos/Kconfig +++ b/arch/arm/mach-exynos/Kconfig @@ -118,6 +118,7 @@ config SOC_EXYNOS5800 bool "Samsung EXYNOS5800" default y depends on SOC_EXYNOS5420 + select EXYNOS_REGULATOR_COUPLER config EXYNOS_MCPM bool diff --git a/drivers/soc/samsung/Kconfig b/drivers/soc/samsung/Kconfig index c7a2003687c7..264185664594 100644 --- a/drivers/soc/samsung/Kconfig +++ b/drivers/soc/samsung/Kconfig @@ -37,4 +37,7 @@ config EXYNOS_PM_DOMAINS bool "Exynos PM domains" if COMPILE_TEST depends on PM_GENERIC_DOMAINS || COMPILE_TEST +config EXYNOS_REGULATOR_COUPLER + bool "Exynos SoC Regulator Coupler" if COMPILE_TEST + depends on ARCH_EXYNOS || COMPILE_TEST endif diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile index edd1d6ea064d..ecc3a32f6406 100644 --- a/drivers/soc/samsung/Makefile +++ b/drivers/soc/samsung/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_EXYNOS_PMU) += exynos-pmu.o obj-$(CONFIG_EXYNOS_PMU_ARM_DRIVERS) += exynos3250-pmu.o exynos4-pmu.o \ exynos5250-pmu.o exynos5420-pmu.o obj-$(CONFIG_EXYNOS_PM_DOMAINS) += pm_domains.o +obj-$(CONFIG_EXYNOS_REGULATOR_COUPLER) += exynos-regulator-coupler.o diff --git a/drivers/soc/samsung/exynos-regulator-coupler.c b/drivers/soc/samsung/exynos-regulator-coupler.c new file mode 100644 index 000000000000..54445918bd75 --- /dev/null +++ b/drivers/soc/samsung/exynos-regulator-coupler.c @@ -0,0 +1,59 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2020 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + * Author: Marek Szyprowski + * + * Samsung Exynos SoC voltage coupler + */ + +#include +#include +#include +#include +#include + +static int exynos_coupler_balance_voltage(struct regulator_coupler *coupler, + struct regulator_dev *rdev, + suspend_state_t state) +{ + struct coupling_desc *c_desc = &rdev->coupling_desc; + int ret, cons_uV = 0, cons_max_uV = INT_MAX; + bool skip_coupled = false; + + /* get coupled regulator constraints */ + ret = regulator_check_consumers(c_desc->coupled_rdevs[1], &cons_uV, + &cons_max_uV, state); + if (ret < 0) + return ret; + + /* skip adjusting coupled regulator if it has no constraints set yet */ + if (cons_uV == 0) + skip_coupled = true; + + return regulator_do_balance_voltage(rdev, state, skip_coupled); +} + +static int exynos_coupler_attach(struct regulator_coupler *coupler, + struct regulator_dev *rdev) +{ + if (strcmp(rdev_get_name(rdev), "vdd_arm") == 0 || + strcmp(rdev_get_name(rdev), "vdd_int") == 0) + return 0; + + return -EINVAL; +} + +static struct regulator_coupler exynos_coupler = { + .attach_regulator = exynos_coupler_attach, + .balance_voltage = exynos_coupler_balance_voltage, +}; + +static int __init exynos_coupler_init(void) +{ + if (!of_machine_is_compatible("samsung,exynos5800")) + return 0; + + return regulator_coupler_register(&exynos_coupler); +} +arch_initcall(exynos_coupler_init);