From patchwork Thu Feb 27 05:35:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vignesh Raghavendra X-Patchwork-Id: 11407813 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EA610924 for ; Thu, 27 Feb 2020 05:35:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C0B5D2467F for ; Thu, 27 Feb 2020 05:35:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="k4zFf8OT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727403AbgB0FfV (ORCPT ); Thu, 27 Feb 2020 00:35:21 -0500 Received: from lelv0143.ext.ti.com ([198.47.23.248]:45152 "EHLO lelv0143.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725730AbgB0FfV (ORCPT ); Thu, 27 Feb 2020 00:35:21 -0500 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id 01R5ZFKI114498; Wed, 26 Feb 2020 23:35:16 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1582781716; bh=R1V1m9GrbruUza5i7esnpYgtknu49007IOG/hcZMdY0=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=k4zFf8OTMkwyfRZjm3crZOtifVU38ZnnuXqx2U4EsPACj5PGPJvm+WbRzs/b3xzCR sdsAi7oyufJHwh/kfjslKuEYMbch2EbyGjjk/nJFmQdos0pmWnVF4u4/h4ZJlt7bqd 2yqJV/PP8B64nAAyvKSiAVZ6gY3KnvgYOpuh/NCw= Received: from DFLE108.ent.ti.com (dfle108.ent.ti.com [10.64.6.29]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTP id 01R5ZFmT059165; Wed, 26 Feb 2020 23:35:15 -0600 Received: from DFLE101.ent.ti.com (10.64.6.22) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3; Wed, 26 Feb 2020 23:35:15 -0600 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE101.ent.ti.com (10.64.6.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3 via Frontend Transport; Wed, 26 Feb 2020 23:35:15 -0600 Received: from a0132425.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 01R5Z6eg022834; Wed, 26 Feb 2020 23:35:13 -0600 From: Vignesh Raghavendra To: Michael Turquette , Stephen Boyd , Rob Herring , Mark Rutland , Santosh Shilimkar CC: , , , Vignesh Raghavendra , Tero Kristo Subject: [PATCH v4 2/2] clk: keystone: Add new driver to handle syscon based clocks Date: Thu, 27 Feb 2020 11:05:29 +0530 Message-ID: <20200227053529.16479-3-vigneshr@ti.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200227053529.16479-1-vigneshr@ti.com> References: <20200227053529.16479-1-vigneshr@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org On TI's AM654/J721e SoCs, certain clocks can be gatemld/ungated by setting a single bit in SoC's System Control Module registers. Sometime more than one clock control can be in the same register. Add a driver to support such clocks using syscon framework. Driver currently supports controlling EHRPWM's TimeBase clock(TBCLK) for AM654 SoC. Signed-off-by: Vignesh Raghavendra --- drivers/clk/keystone/Kconfig | 8 ++ drivers/clk/keystone/Makefile | 1 + drivers/clk/keystone/syscon-clk.c | 172 ++++++++++++++++++++++++++++++ 3 files changed, 181 insertions(+) create mode 100644 drivers/clk/keystone/syscon-clk.c diff --git a/drivers/clk/keystone/Kconfig b/drivers/clk/keystone/Kconfig index 38aeefb1e808..ab613f28b502 100644 --- a/drivers/clk/keystone/Kconfig +++ b/drivers/clk/keystone/Kconfig @@ -26,3 +26,11 @@ config TI_SCI_CLK_PROBE_FROM_FW This is mostly only useful for debugging purposes, and will increase the boot time of the device. If you want the clocks probed from firmware, say Y. Otherwise, say N. + +config TI_SYSCON_CLK + tristate "Syscon based clock driver for K2/K3 SoCs" + depends on ARCH_KEYSTONE || ARCH_K3 || COMPILE_TEST + default ARCH_KEYSTONE || ARCH_K3 + help + This adds clock driver support for syscon based gate + clocks on TI's K2 and K3 SoCs. diff --git a/drivers/clk/keystone/Makefile b/drivers/clk/keystone/Makefile index d044de6f965c..0e426e648f7c 100644 --- a/drivers/clk/keystone/Makefile +++ b/drivers/clk/keystone/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_COMMON_CLK_KEYSTONE) += pll.o gate.o obj-$(CONFIG_TI_SCI_CLK) += sci-clk.o +obj-$(CONFIG_TI_SYSCON_CLK) += syscon-clk.o diff --git a/drivers/clk/keystone/syscon-clk.c b/drivers/clk/keystone/syscon-clk.c new file mode 100644 index 000000000000..8d7dbea3bd30 --- /dev/null +++ b/drivers/clk/keystone/syscon-clk.c @@ -0,0 +1,172 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/ + */ + +#include +#include +#include +#include +#include + +struct ti_syscon_gate_clk_priv { + struct clk_hw hw; + struct regmap *regmap; + u32 reg; + u32 idx; +}; + +struct ti_syscon_gate_clk_data { + char *name; + u32 offset; + u32 bit_idx; +}; + +static struct +ti_syscon_gate_clk_priv *to_ti_syscon_gate_clk_priv(struct clk_hw *hw) +{ + return container_of(hw, struct ti_syscon_gate_clk_priv, hw); +} + +static int ti_syscon_gate_clk_enable(struct clk_hw *hw) +{ + struct ti_syscon_gate_clk_priv *priv = to_ti_syscon_gate_clk_priv(hw); + + return regmap_write_bits(priv->regmap, priv->reg, priv->idx, + priv->idx); +} + +static void ti_syscon_gate_clk_disable(struct clk_hw *hw) +{ + struct ti_syscon_gate_clk_priv *priv = to_ti_syscon_gate_clk_priv(hw); + + regmap_write_bits(priv->regmap, priv->reg, priv->idx, 0); +} + +static int ti_syscon_gate_clk_is_enabled(struct clk_hw *hw) +{ + unsigned int val; + struct ti_syscon_gate_clk_priv *priv = to_ti_syscon_gate_clk_priv(hw); + + regmap_read(priv->regmap, priv->reg, &val); + + return !!(val & priv->idx); +} + +static const struct clk_ops ti_syscon_gate_clk_ops = { + .enable = ti_syscon_gate_clk_enable, + .disable = ti_syscon_gate_clk_disable, + .is_enabled = ti_syscon_gate_clk_is_enabled, +}; + +static struct clk_hw +*ti_syscon_gate_clk_register(struct device *dev, struct regmap *regmap, + const struct ti_syscon_gate_clk_data *data) +{ + struct ti_syscon_gate_clk_priv *priv; + struct clk_init_data init; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return ERR_PTR(-ENOMEM); + + init.name = data->name; + init.ops = &ti_syscon_gate_clk_ops; + init.parent_names = NULL; + init.num_parents = 0; + init.flags = 0; + + priv->regmap = regmap; + priv->reg = data->offset; + priv->idx = BIT(data->bit_idx); + priv->hw.init = &init; + + ret = devm_clk_hw_register(dev, &priv->hw); + if (ret) + return ERR_PTR(ret); + + return &priv->hw; +} + +static int ti_syscon_gate_clk_probe(struct platform_device *pdev) +{ + const struct ti_syscon_gate_clk_data *data, *p; + struct clk_hw_onecell_data *hw_data; + struct device *dev = &pdev->dev; + struct regmap *regmap; + int num_clks, i; + + data = device_get_match_data(dev); + if (!data) + return -EINVAL; + + regmap = syscon_node_to_regmap(dev->of_node); + if (IS_ERR(regmap)) { + if (PTR_ERR(regmap) == -EPROBE_DEFER) + return -EPROBE_DEFER; + dev_err(dev, "failed to find parent regmap\n"); + return PTR_ERR(regmap); + } + + num_clks = 0; + for (p = data; p->name; p++) + num_clks++; + + hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, num_clks), + GFP_KERNEL); + if (!hw_data) + return -ENOMEM; + + hw_data->num = num_clks; + + for (i = 0; i < num_clks; i++) { + hw_data->hws[i] = ti_syscon_gate_clk_register(dev, regmap, + &data[i]); + if (IS_ERR(hw_data->hws[i])) + dev_warn(dev, "failed to register %s\n", + data[i].name); + } + + return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, + hw_data); +} + +#define TI_SYSCON_CLK_GATE(_name, _offset, _bit_idx) \ + { \ + .name = _name, \ + .offset = (_offset), \ + .bit_idx = (_bit_idx), \ + } + +static const struct ti_syscon_gate_clk_data am654_clk_data[] = { + TI_SYSCON_CLK_GATE("ehrpwm_tbclk0", 0x0, 0), + TI_SYSCON_CLK_GATE("ehrpwm_tbclk1", 0x4, 0), + TI_SYSCON_CLK_GATE("ehrpwm_tbclk2", 0x8, 0), + TI_SYSCON_CLK_GATE("ehrpwm_tbclk3", 0xc, 0), + TI_SYSCON_CLK_GATE("ehrpwm_tbclk4", 0x10, 0), + TI_SYSCON_CLK_GATE("ehrpwm_tbclk5", 0x14, 0), + { /* Sentinel */ }, +}; + +static const struct of_device_id ti_syscon_gate_clk_ids[] = { + { + .compatible = "ti,am654-ehrpwm-tbclk", + .data = &am654_clk_data, + }, + { } +}; +MODULE_DEVICE_TABLE(of, ti_syscon_gate_clk_ids); + +static struct platform_driver ti_syscon_gate_clk_driver = { + .probe = ti_syscon_gate_clk_probe, + .driver = { + .name = "ti-syscon-gate-clk", + .of_match_table = ti_syscon_gate_clk_ids, + }, +}; +module_platform_driver(ti_syscon_gate_clk_driver); + +MODULE_AUTHOR("Vignesh Raghavendra "); +MODULE_DESCRIPTION("Syscon backed gate-clock driver"); +MODULE_LICENSE("GPL");