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Wed, 24 Jan 2024 23:21:41 -0800 (PST) Received: from localhost.localdomain ([188.162.200.139]) by smtp.gmail.com with ESMTPSA id x37-20020a056512132500b0050e75f9e8c8sm2780070lfu.98.2024.01.24.23.21.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Jan 2024 23:21:41 -0800 (PST) From: Aleksandr Shubin To: linux-kernel@vger.kernel.org Cc: Aleksandr Shubin , Brandon Cheo Fusi , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Paul Walmsley , Palmer Dabbelt , Albert Ou , Philipp Zabel , Marc Kleine-Budde , Cristian Ciocaltea , Maksim Kiselev , John Watts , linux-pwm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-riscv@lists.infradead.org Subject: [PATCH v7 2/3] pwm: Add Allwinner's D1/T113-S3/R329 SoCs PWM support Date: Thu, 25 Jan 2024 10:19:42 +0300 Message-Id: <20240125072032.1151383-3-privatesub2@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240125072032.1151383-1-privatesub2@gmail.com> References: <20240125072032.1151383-1-privatesub2@gmail.com> Precedence: bulk X-Mailing-List: linux-pwm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Allwinner's D1, T113-S3 and R329 SoCs have a quite different PWM controllers with ones supported by pwm-sun4i driver. This patch adds a PWM controller driver for Allwinner's D1, T113-S3 and R329 SoCs. The main difference between these SoCs is the number of channels defined by the DT property. Co-developed-by: Brandon Cheo Fusi Signed-off-by: Brandon Cheo Fusi Signed-off-by: Aleksandr Shubin --- drivers/pwm/Kconfig | 10 ++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-sun20i.c | 380 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 391 insertions(+) create mode 100644 drivers/pwm/pwm-sun20i.c diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 4b956d661755..d2e0a080eb3c 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -625,6 +625,16 @@ config PWM_SUN4I To compile this driver as a module, choose M here: the module will be called pwm-sun4i. +config PWM_SUN20I + tristate "Allwinner D1/T113s/R329 PWM support" + depends on ARCH_SUNXI || COMPILE_TEST + depends on COMMON_CLK + help + Generic PWM framework driver for Allwinner D1/T113s/R329 SoCs. + + To compile this driver as a module, choose M here: the module + will be called pwm-sun20i. + config PWM_SUNPLUS tristate "Sunplus PWM support" depends on ARCH_SUNPLUS || COMPILE_TEST diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index c5ec9e168ee7..dcad0d5a2430 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -58,6 +58,7 @@ obj-$(CONFIG_PWM_STM32) += pwm-stm32.o obj-$(CONFIG_PWM_STM32_LP) += pwm-stm32-lp.o obj-$(CONFIG_PWM_STMPE) += pwm-stmpe.o obj-$(CONFIG_PWM_SUN4I) += pwm-sun4i.o +obj-$(CONFIG_PWM_SUN20I) += pwm-sun20i.o obj-$(CONFIG_PWM_SUNPLUS) += pwm-sunplus.o obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o obj-$(CONFIG_PWM_TIECAP) += pwm-tiecap.o diff --git a/drivers/pwm/pwm-sun20i.c b/drivers/pwm/pwm-sun20i.c new file mode 100644 index 000000000000..d9e151f27f20 --- /dev/null +++ b/drivers/pwm/pwm-sun20i.c @@ -0,0 +1,380 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PWM Controller Driver for sunxi platforms (D1, T113-S3 and R329) + * + * Limitations: + * - When the parameters change, current running period will not be completed + * and run new settings immediately. + * - It output HIGH-Z state when PWM channel disabled. + * + * Copyright (c) 2023 Aleksandr Shubin + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define SUN20I_PWM_CLK_CFG(chan) (0x20 + (((chan) >> 1) * 0x4)) +#define SUN20I_PWM_CLK_CFG_SRC GENMASK(8, 7) +#define SUN20I_PWM_CLK_CFG_DIV_M GENMASK(3, 0) +#define SUN20I_PWM_CLK_DIV_M_MAX 8 + +#define SUN20I_PWM_CLK_GATE 0x40 +#define SUN20I_PWM_CLK_GATE_BYPASS(chan) BIT((chan) + 16) +#define SUN20I_PWM_CLK_GATE_GATING(chan) BIT(chan) + +#define SUN20I_PWM_ENABLE 0x80 +#define SUN20I_PWM_ENABLE_EN(chan) BIT(chan) + +#define SUN20I_PWM_CTL(chan) (0x100 + (chan) * 0x20) +#define SUN20I_PWM_CTL_ACT_STA BIT(8) +#define SUN20I_PWM_CTL_PRESCAL_K GENMASK(7, 0) +#define SUN20I_PWM_CTL_PRESCAL_K_MAX 0xff + +#define SUN20I_PWM_PERIOD(chan) (0x104 + (chan) * 0x20) +#define SUN20I_PWM_PERIOD_ENTIRE_CYCLE GENMASK(31, 16) +#define SUN20I_PWM_PERIOD_ACT_CYCLE GENMASK(15, 0) + +#define SUN20I_PWM_PCNTR_SIZE BIT(16) + +/** + * SUN20I_PWM_MAGIC is used to quickly compute the values of the clock dividers + * div_m (SUN20I_PWM_CLK_CFG_DIV_M) & prescale_k (SUN20I_PWM_CTL_PRESCAL_K) + * without using a loop. These dividers limit the # of cycles in a period + * to SUN20I_PWM_PCNTR_SIZE by applying a scaling factor of + * 1/(div_m * (prescale_k + 1)) to the clock source. + * + * SUN20I_PWM_MAGIC is derived by solving for div_m and prescale_k + * such that for a given requested period, + * + * i) div_m is minimized for any prescale_k ≤ SUN20I_PWM_CTL_PRESCAL_K_MAX, + * ii) prescale_k is minimized. + * + * The derivation proceeds as follows, with val = # of cycles for reqested + * period: + * + * for a given value of div_m we want the smallest prescale_k such that + * + * (val >> div_m) // (prescale_k + 1) ≤ 65536 (SUN20I_PWM_PCNTR_SIZE) + * + * This is equivalent to: + * + * (val >> div_m) ≤ 65536 * (prescale_k + 1) + prescale_k + * ⟺ (val >> div_m) ≤ 65537 * prescale_k + 65536 + * ⟺ (val >> div_m) - 65536 ≤ 65537 * prescale_k + * ⟺ ((val >> div_m) - 65536) / 65537 ≤ prescale_k + * + * As prescale_k is integer, this becomes + * + * ((val >> div_m) - 65536) // 65537 ≤ prescale_k + * + * And is minimized at + * + * ((val >> div_m) - 65536) // 65537 + * + * Now we pick the smallest div_m that satifies prescale_k ≤ 255 + * (i.e SUN20I_PWM_CTL_PRESCAL_K_MAX), + * + * ((val >> div_m) - 65536) // 65537 ≤ 255 + * ⟺ (val >> div_m) - 65536 ≤ 255 * 65537 + 65536 + * ⟺ val >> div_m ≤ 255 * 65537 + 2 * 65536 + * ⟺ val >> div_m < (255 * 65537 + 2 * 65536 + 1) + * ⟺ div_m = fls((val) / (255 * 65537 + 2 * 65536 + 1)) + * + * Suggested by Uwe Kleine-König + */ +#define SUN20I_PWM_MAGIC (255 * 65537 + 2 * 65536 + 1) + +struct sun20i_pwm_chip { + struct clk *clk_bus, *clk_hosc, *clk_apb0; + struct reset_control *rst; + struct pwm_chip chip; + void __iomem *base; + /* Mutex to protect pwm apply state */ + struct mutex mutex; +}; + +static inline struct sun20i_pwm_chip *to_sun20i_pwm_chip(struct pwm_chip *chip) +{ + return container_of(chip, struct sun20i_pwm_chip, chip); +} + +static inline u32 sun20i_pwm_readl(struct sun20i_pwm_chip *chip, + unsigned long offset) +{ + return readl(chip->base + offset); +} + +static inline void sun20i_pwm_writel(struct sun20i_pwm_chip *chip, + u32 val, unsigned long offset) +{ + writel(val, chip->base + offset); +} + +static int sun20i_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) +{ + struct sun20i_pwm_chip *sun20i_chip = to_sun20i_pwm_chip(chip); + u16 ent_cycle, act_cycle, prescale_k; + u64 clk_rate, tmp; + u8 div_m; + u32 val; + + mutex_lock(&sun20i_chip->mutex); + + val = sun20i_pwm_readl(sun20i_chip, SUN20I_PWM_CLK_CFG(pwm->hwpwm)); + div_m = FIELD_GET(SUN20I_PWM_CLK_CFG_DIV_M, val); + if (div_m > SUN20I_PWM_CLK_DIV_M_MAX) + div_m = SUN20I_PWM_CLK_DIV_M_MAX; + + if (FIELD_GET(SUN20I_PWM_CLK_CFG_SRC, val) == 0) + clk_rate = clk_get_rate(sun20i_chip->clk_hosc); + else + clk_rate = clk_get_rate(sun20i_chip->clk_apb0); + + val = sun20i_pwm_readl(sun20i_chip, SUN20I_PWM_CTL(pwm->hwpwm)); + state->polarity = (SUN20I_PWM_CTL_ACT_STA & val) ? + PWM_POLARITY_NORMAL : PWM_POLARITY_INVERSED; + + prescale_k = FIELD_GET(SUN20I_PWM_CTL_PRESCAL_K, val) + 1; + + val = sun20i_pwm_readl(sun20i_chip, SUN20I_PWM_ENABLE); + state->enabled = (SUN20I_PWM_ENABLE_EN(pwm->hwpwm) & val) ? true : false; + + val = sun20i_pwm_readl(sun20i_chip, SUN20I_PWM_PERIOD(pwm->hwpwm)); + + mutex_unlock(&sun20i_chip->mutex); + + act_cycle = FIELD_GET(SUN20I_PWM_PERIOD_ACT_CYCLE, val); + ent_cycle = FIELD_GET(SUN20I_PWM_PERIOD_ENTIRE_CYCLE, val); + + /* + * The duration of the active phase should not be longer + * than the duration of the period + */ + if (act_cycle > ent_cycle) + act_cycle = ent_cycle; + + tmp = ((u64)(act_cycle) * prescale_k << div_m) * NSEC_PER_SEC; + state->duty_cycle = DIV_ROUND_UP_ULL(tmp, clk_rate); + tmp = ((u64)(ent_cycle) * prescale_k << div_m) * NSEC_PER_SEC; + state->period = DIV_ROUND_UP_ULL(tmp, clk_rate); + + return 0; +} + +static int sun20i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) +{ + struct sun20i_pwm_chip *sun20i_chip = to_sun20i_pwm_chip(chip); + u64 bus_rate, hosc_rate, val, ent_cycle, act_cycle; + u32 clk_gate, clk_cfg, pwm_en, ctl, reg_period; + u32 prescale_k, div_m; + bool use_bus_clk; + int ret = 0; + + mutex_lock(&sun20i_chip->mutex); + + pwm_en = sun20i_pwm_readl(sun20i_chip, SUN20I_PWM_ENABLE); + + if (state->enabled != pwm->state.enabled) { + clk_gate = sun20i_pwm_readl(sun20i_chip, SUN20I_PWM_CLK_GATE); + + if (!state->enabled) { + clk_gate &= ~SUN20I_PWM_CLK_GATE_GATING(pwm->hwpwm); + pwm_en &= ~SUN20I_PWM_ENABLE_EN(pwm->hwpwm); + sun20i_pwm_writel(sun20i_chip, pwm_en, SUN20I_PWM_ENABLE); + sun20i_pwm_writel(sun20i_chip, clk_gate, SUN20I_PWM_CLK_GATE); + } + } + + if (state->polarity != pwm->state.polarity || + state->duty_cycle != pwm->state.duty_cycle || + state->period != pwm->state.period) { + ctl = sun20i_pwm_readl(sun20i_chip, SUN20I_PWM_CTL(pwm->hwpwm)); + clk_cfg = sun20i_pwm_readl(sun20i_chip, SUN20I_PWM_CLK_CFG(pwm->hwpwm)); + hosc_rate = clk_get_rate(sun20i_chip->clk_hosc); + bus_rate = clk_get_rate(sun20i_chip->clk_apb0); + if (pwm_en & SUN20I_PWM_ENABLE_EN(pwm->hwpwm ^ 1)) { + /* if the neighbor channel is enable, check period only */ + use_bus_clk = FIELD_GET(SUN20I_PWM_CLK_CFG_SRC, clk_cfg) != 0; + val = mul_u64_u64_div_u64(state->period, + (use_bus_clk ? bus_rate : hosc_rate), + NSEC_PER_SEC); + + div_m = FIELD_GET(SUN20I_PWM_CLK_CFG_DIV_M, clk_cfg); + } else { + /* check period and select clock source */ + use_bus_clk = false; + val = mul_u64_u64_div_u64(state->period, hosc_rate, NSEC_PER_SEC); + if (val <= 1) { + use_bus_clk = true; + val = mul_u64_u64_div_u64(state->period, bus_rate, NSEC_PER_SEC); + if (val <= 1) { + ret = -EINVAL; + goto unlock_mutex; + } + } + div_m = fls(DIV_ROUND_DOWN_ULL(val, SUN20I_PWM_MAGIC)); + if (div_m > SUN20I_PWM_CLK_DIV_M_MAX) { + ret = -EINVAL; + goto unlock_mutex; + } + + /* set up the CLK_DIV_M and clock CLK_SRC */ + clk_cfg = FIELD_PREP(SUN20I_PWM_CLK_CFG_DIV_M, div_m); + clk_cfg |= FIELD_PREP(SUN20I_PWM_CLK_CFG_SRC, use_bus_clk); + + sun20i_pwm_writel(sun20i_chip, clk_cfg, SUN20I_PWM_CLK_CFG(pwm->hwpwm)); + } + + /* calculate prescale_k, PWM entire cycle */ + ent_cycle = val >> div_m; + prescale_k = DIV_ROUND_DOWN_ULL(ent_cycle, 65537); + if (prescale_k > SUN20I_PWM_CTL_PRESCAL_K_MAX) + prescale_k = SUN20I_PWM_CTL_PRESCAL_K_MAX; + + do_div(ent_cycle, prescale_k + 1); + + /* for N cycles, PPRx.PWM_ENTIRE_CYCLE = (N-1) */ + reg_period = FIELD_PREP(SUN20I_PWM_PERIOD_ENTIRE_CYCLE, ent_cycle - 1); + + /* set duty cycle */ + val = mul_u64_u64_div_u64(state->duty_cycle, + (use_bus_clk ? bus_rate : hosc_rate), + NSEC_PER_SEC); + act_cycle = val >> div_m; + do_div(act_cycle, prescale_k + 1); + + /* + * The formula of the output period and the duty-cycle for PWM are as follows. + * T period = (PWM01_CLK / PWM0_PRESCALE_K)^-1 * (PPR0.PWM_ENTIRE_CYCLE + 1) + * T high-level = (PWM01_CLK / PWM0_PRESCALE_K)^-1 * PPR0.PWM_ACT_CYCLE + * Duty-cycle = T high-level / T period + */ + reg_period |= FIELD_PREP(SUN20I_PWM_PERIOD_ACT_CYCLE, act_cycle); + sun20i_pwm_writel(sun20i_chip, reg_period, SUN20I_PWM_PERIOD(pwm->hwpwm)); + + ctl = FIELD_PREP(SUN20I_PWM_CTL_PRESCAL_K, prescale_k); + if (state->polarity == PWM_POLARITY_NORMAL) + ctl |= SUN20I_PWM_CTL_ACT_STA; + + sun20i_pwm_writel(sun20i_chip, ctl, SUN20I_PWM_CTL(pwm->hwpwm)); + } + + if (state->enabled != pwm->state.enabled && state->enabled) { + clk_gate &= ~SUN20I_PWM_CLK_GATE_BYPASS(pwm->hwpwm); + clk_gate |= SUN20I_PWM_CLK_GATE_GATING(pwm->hwpwm); + pwm_en |= SUN20I_PWM_ENABLE_EN(pwm->hwpwm); + sun20i_pwm_writel(sun20i_chip, pwm_en, SUN20I_PWM_ENABLE); + sun20i_pwm_writel(sun20i_chip, clk_gate, SUN20I_PWM_CLK_GATE); + } + +unlock_mutex: + mutex_unlock(&sun20i_chip->mutex); + + return ret; +} + +static const struct pwm_ops sun20i_pwm_ops = { + .get_state = sun20i_pwm_get_state, + .apply = sun20i_pwm_apply, + .owner = THIS_MODULE, +}; + +static const struct of_device_id sun20i_pwm_dt_ids[] = { + { .compatible = "allwinner,sun20i-d1-pwm" }, + { }, +}; +MODULE_DEVICE_TABLE(of, sun20i_pwm_dt_ids); + +static int sun20i_pwm_probe(struct platform_device *pdev) +{ + struct sun20i_pwm_chip *sun20i_chip; + int ret; + + sun20i_chip = devm_kzalloc(&pdev->dev, sizeof(*sun20i_chip), GFP_KERNEL); + if (!sun20i_chip) + return -ENOMEM; + + sun20i_chip->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sun20i_chip->base)) + return PTR_ERR(sun20i_chip->base); + + sun20i_chip->clk_bus = devm_clk_get_enabled(&pdev->dev, "bus"); + if (IS_ERR(sun20i_chip->clk_bus)) + return dev_err_probe(&pdev->dev, PTR_ERR(sun20i_chip->clk_bus), + "failed to get bus clock\n"); + + sun20i_chip->clk_hosc = devm_clk_get_enabled(&pdev->dev, "hosc"); + if (IS_ERR(sun20i_chip->clk_hosc)) + return dev_err_probe(&pdev->dev, PTR_ERR(sun20i_chip->clk_hosc), + "failed to get hosc clock\n"); + + sun20i_chip->clk_apb0 = devm_clk_get_enabled(&pdev->dev, "apb0"); + if (IS_ERR(sun20i_chip->clk_apb0)) + return dev_err_probe(&pdev->dev, PTR_ERR(sun20i_chip->clk_apb0), + "failed to get apb0 clock\n"); + + sun20i_chip->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(sun20i_chip->rst)) + return dev_err_probe(&pdev->dev, PTR_ERR(sun20i_chip->rst), + "failed to get bus reset\n"); + + ret = of_property_read_u32(pdev->dev.of_node, "allwinner,pwm-channels", + &sun20i_chip->chip.npwm); + if (ret) + sun20i_chip->chip.npwm = 8; + + if (sun20i_chip->chip.npwm > 16) + sun20i_chip->chip.npwm = 16; + + /* Deassert reset */ + ret = reset_control_deassert(sun20i_chip->rst); + if (ret) + return dev_err_probe(&pdev->dev, ret, "failed to deassert reset\n"); + + sun20i_chip->chip.dev = &pdev->dev; + sun20i_chip->chip.ops = &sun20i_pwm_ops; + + mutex_init(&sun20i_chip->mutex); + + ret = pwmchip_add(&sun20i_chip->chip); + if (ret < 0) { + reset_control_assert(sun20i_chip->rst); + return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n"); + } + + platform_set_drvdata(pdev, sun20i_chip); + + return 0; +} + +static void sun20i_pwm_remove(struct platform_device *pdev) +{ + struct sun20i_pwm_chip *sun20i_chip = platform_get_drvdata(pdev); + + pwmchip_remove(&sun20i_chip->chip); + + reset_control_assert(sun20i_chip->rst); +} + +static struct platform_driver sun20i_pwm_driver = { + .driver = { + .name = "sun20i-pwm", + .of_match_table = sun20i_pwm_dt_ids, + }, + .probe = sun20i_pwm_probe, + .remove_new = sun20i_pwm_remove, +}; +module_platform_driver(sun20i_pwm_driver); + +MODULE_AUTHOR("Aleksandr Shubin "); +MODULE_DESCRIPTION("Allwinner sun20i PWM driver"); +MODULE_LICENSE("GPL"); -- 2.25.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E2F74C47258 for ; 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X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, John Watts , Krzysztof Kozlowski , linux-riscv@lists.infradead.org, Samuel Holland , Albert Ou , Jernej Skrabec , Chen-Yu Tsai , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , linux-sunxi@lists.linux.dev, linux-pwm@vger.kernel.org, Conor Dooley , Aleksandr Shubin , Rob Herring , Marc Kleine-Budde , Paul Walmsley , Maksim Kiselev , linux-arm-kernel@lists.infradead.org, Brandon Cheo Fusi , Palmer Dabbelt , Philipp Zabel Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org QWxsd2lubmVyJ3MgRDEsIFQxMTMtUzMgYW5kIFIzMjkgU29DcyBoYXZlIGEgcXVpdGUgZGlmZmVy ZW50IFBXTQpjb250cm9sbGVycyB3aXRoIG9uZXMgc3VwcG9ydGVkIGJ5IHB3bS1zdW40aSBkcml2 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devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-riscv@lists.infradead.org Subject: [PATCH v7 2/3] pwm: Add Allwinner's D1/T113-S3/R329 SoCs PWM support Date: Thu, 25 Jan 2024 10:19:42 +0300 Message-Id: <20240125072032.1151383-3-privatesub2@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240125072032.1151383-1-privatesub2@gmail.com> References: <20240125072032.1151383-1-privatesub2@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240124_232144_429147_26FE1F8D X-CRM114-Status: GOOD ( 31.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: 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