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([2a01:e0a:106d:1080:6674:33bf:38d6:bc10]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48dfd4f8bd9sm22298261f8f.35.2026.10.19.00.40.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Oct 2026 00:40:03 -0700 (PDT) Message-ID: <98df3ac1-c6ae-4acb-b0ee-ddda92487660@linaro.org> Date: Mon, 19 Oct 2026 09:40:03 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Subject: Re: [PATCH 3/3] i3c: master: svc: Add Amlogic A9 glue layer To: junyi.zhao@amlogic.com, Alexandre Belloni , Frank Li , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Miquel Raynal , Kees Cook , "Gustavo A. R. Silva" Cc: linux-i3c@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, imx@lists.linux.dev, linux-hardening@vger.kernel.org, xianwei.zhao@amlogic.com, Kelvin.Zhang@amlogic.com References: <20261019-a9_i3c-v1-0-329d819d621f@amlogic.com> <20261019-a9_i3c-v1-3-329d819d621f@amlogic.com> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <20261019-a9_i3c-v1-3-329d819d621f@amlogic.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261019_004006_682044_3FA55346 X-CRM114-Status: GOOD ( 30.70 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Neil Armstrong Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On 10/19/26 07:34, Junyi Zhao via B4 Relay wrote: > From: Junyi Zhao > > Add support for the Amlogic A9 implementation of the Silvaco > SVC I3C controller. > > The glue layer provides Amlogic-specific operations and resource > handling while reusing the common SVC I3C core driver. > > Add a corresponding MAINTAINERS entry for the Amlogic I3C > controller. > > Signed-off-by: Junyi Zhao > --- > MAINTAINERS | 6 + > drivers/i3c/master/svc/Kconfig | 7 + > drivers/i3c/master/svc/Makefile | 1 + > drivers/i3c/master/svc/i3c-amlogic.c | 250 +++++++++++++++++++++++++++++++++++ > 4 files changed, 264 insertions(+) > > diff --git a/MAINTAINERS b/MAINTAINERS > index dffc63af2..478979446 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -1398,6 +1398,12 @@ F: Documentation/userspace-api/media/v4l/metafmt-c3-isp.rst > F: drivers/media/platform/amlogic/c3/isp/ > F: include/uapi/linux/media/amlogic/ > > +AMLOGIC I3C DRIVER > +M: Junyi Zhao > +S: Maintained > +F: Documentation/devicetree/bindings/i3c/amlogic,i3c-a9.yaml > +F: drivers/i3c/master/svc/i3c-amlogic.c > + > AMLOGIC MIPI ADAPTER DRIVER > M: Keke Li > L: linux-media@vger.kernel.org > diff --git a/drivers/i3c/master/svc/Kconfig b/drivers/i3c/master/svc/Kconfig > index 14fa1e542..df3528bc1 100644 > --- a/drivers/i3c/master/svc/Kconfig > +++ b/drivers/i3c/master/svc/Kconfig > @@ -18,4 +18,11 @@ config I3C_SILVACO > compatible strings such as "silvaco,i3c-master-v1" and > "nuvoton,npcm845-i3c". > > +config I3C_AMLOGIC > + tristate "Amlogic I3C support" > + default y > + help > + This selects the Amlogic SoC glue layer support for > + the Silvaco device driver. This driver is used for A9, C5 SoCs. > + > endif # SVC_I3C > diff --git a/drivers/i3c/master/svc/Makefile b/drivers/i3c/master/svc/Makefile > index cf18c5da6..695863d1f 100644 > --- a/drivers/i3c/master/svc/Makefile > +++ b/drivers/i3c/master/svc/Makefile > @@ -3,3 +3,4 @@ > > obj-$(CONFIG_SVC_I3C) += i3c-main.o > obj-$(CONFIG_I3C_SILVACO) += i3c-silvaco.o > +obj-$(CONFIG_I3C_AMLOGIC) += i3c-amlogic.o > diff --git a/drivers/i3c/master/svc/i3c-amlogic.c b/drivers/i3c/master/svc/i3c-amlogic.c > new file mode 100644 > index 000000000..82300d6ae > --- /dev/null > +++ b/drivers/i3c/master/svc/i3c-amlogic.c > @@ -0,0 +1,250 @@ > +// SPDX-License-Identifier: (GPL-2.0-only OR MIT) > +/* > + * Copyright (C) 2026 Amlogic, Inc. All rights reserved > + */ > +#include "i3c-main.h" > +#include > + > +/* Amlogic specific registers */ > +#define I3C_BG_RD_ADDR 0x200 > +#define I3C_BG_WR_ADDR 0x204 > +#define I3C_BG_WR_CTRL 0x208 > +#define I3C_BG_R_TT_LEN 0x20c > +#define I3C_BG_X_CNT 0x210 > +#define I3C_BUS_MON_CTRL 0x214 > +#define I3C_BUS_MON_ADDR 0x218 > +#define I3C_BUS_MON_DATA 0x21c > +#define I3C_BUS_MON_DATA_MAK 0x220 > +#define I3C_CLK_SLOW_DIV_CTRL 0x224 > +#define I3C_BG_R_WCNT_CLR 0x228 > +#define I3C_DEBUG_MODIFY 0x22c > + > +#define I3C_AO_CLK_SLOW_DIV_CTRL 0x300 > +#define I3C_AO_FCLK_DIV_CTRL 0x304 > +#define I3C_AO_FCLK_DIV_MASK GENMASK(7, 0) > +#define I3C_AO_FCLK_DIV_EN BIT(8) > +#define I3C_AO_FCLK_EN BIT(9) > +#define I3C_AO_DEBUG_MODIFY 0x308 > + > +#define I3C_DEFAULT_FCLK_RATE 25000000UL > + > +struct amlogic_i3c_priv { > + int num_clks; > + struct clk_bulk_data *clks; > +}; > + > +struct amlogic_i3c_drvdata { > + int (*fclk_rate_init)(struct svc_i3c_master *master, > + struct clk *fclk, unsigned long rate); > +}; > + > +static int default_i3c_fclk_rate_init(struct svc_i3c_master *master, > + struct clk *fclk, unsigned long rate) > +{ > + int err; > + > + err = clk_set_rate(fclk, rate); > + if (err) > + return dev_err_probe(master->dev, err, > + "setting fast clock rate failed\n"); > + > + return 0; > +} > + > +static int ao_i3c_fclk_rate_init(struct svc_i3c_master *master, > + struct clk *fclk, unsigned long rate) > +{ > + unsigned int div_cnt, reg_val; > + unsigned long fin_freq = clk_get_rate(fclk); > + > + if (!fin_freq) > + return dev_err_probe(master->dev, -EINVAL, > + "can't get I3C fast clock rate\n"); > + > + div_cnt = div64_u64(fin_freq, rate); > + if (!div_cnt || div_cnt > I3C_AO_FCLK_DIV_MASK) > + return dev_err_probe(master->dev, -EINVAL, > + "requested fast clock frequency too low\n"); > + > + reg_val = I3C_AO_FCLK_DIV_EN | I3C_AO_FCLK_EN | (div_cnt - 1); > + writel(reg_val, master->regs + I3C_AO_FCLK_DIV_CTRL); > + > + return 0; > +} You could also create a clock divider, register it and use a common clk_set_rate() for both setups. Neil > + > +static int amlogic_i3c_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + const struct amlogic_i3c_drvdata *data; > + struct svc_i3c_master *master; > + struct amlogic_i3c_priv *priv; > + struct clk *fclk; > + int ret, i; > + > + master = svc_i3c_master_alloc(dev); > + if (!master) > + return -ENOMEM; > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + master->drvdata = of_device_get_match_data(dev); > + if (!master->drvdata) > + return -EINVAL; > + > + data = master->drvdata->bsp_data; > + if (!data) > + return -EINVAL; > + > + master->regs = devm_platform_ioremap_resource(pdev, 0); > + if (IS_ERR(master->regs)) > + return PTR_ERR(master->regs); > + > + master->irq = platform_get_irq(pdev, 0); > + if (master->irq < 0) > + return master->irq; > + > + priv->num_clks = devm_clk_bulk_get_all(dev, &priv->clks); > + if (priv->num_clks < 0) > + return dev_err_probe(dev, -EINVAL, "can't get I3C clocks\n"); > + > + for (i = 0; i < priv->num_clks; i++) { > + if (!strcmp(priv->clks[i].id, "fast_clk")) > + break; > + } > + > + if (i == priv->num_clks) > + return dev_err_probe(dev, -EINVAL, > + "can't get I3C peripheral clock\n"); > + > + if (IS_ERR(priv->clks[i].clk)) > + return PTR_ERR(priv->clks[i].clk); > + fclk = priv->clks[i].clk; > + > + ret = clk_bulk_prepare_enable(priv->num_clks, priv->clks); > + if (ret) > + return dev_err_probe(dev, ret, "can't enable I3C clocks\n"); > + > + master->dev = dev; > + master->bsp_priv = priv; > + ret = data->fclk_rate_init(master, fclk, I3C_DEFAULT_FCLK_RATE); > + if (ret) > + goto err_disable_clks; > + master->fclk_rate = I3C_DEFAULT_FCLK_RATE; > + > + pm_runtime_set_autosuspend_delay(dev, SVC_I3C_PM_TIMEOUT_MS); > + pm_runtime_use_autosuspend(dev); > + pm_runtime_get_noresume(dev); > + pm_runtime_set_active(dev); > + pm_runtime_enable(dev); > + > + ret = svc_i3c_master_probe(pdev, master); > + if (ret) > + goto rpm_disable; > + > + platform_set_drvdata(pdev, master); > + pm_runtime_put_autosuspend(dev); > + > + return 0; > + > +rpm_disable: > + pm_runtime_dont_use_autosuspend(dev); > + pm_runtime_put_noidle(dev); > + pm_runtime_disable(dev); > + pm_runtime_set_suspended(dev); > + > +err_disable_clks: > + clk_bulk_disable_unprepare(priv->num_clks, priv->clks); > + > + return ret; > +} > + > +static void amlogic_i3c_remove(struct platform_device *pdev) > +{ > + struct svc_i3c_master *master = platform_get_drvdata(pdev); > + > + svc_i3c_master_remove(master); > + > + pm_runtime_dont_use_autosuspend(&pdev->dev); > + pm_runtime_disable(&pdev->dev); > +} > + > +static int __maybe_unused amlogic_i3c_runtime_suspend(struct device *dev) > +{ > + struct svc_i3c_master *master = dev_get_drvdata(dev); > + struct amlogic_i3c_priv *priv = master->bsp_priv; > + > + svc_i3c_save_regs(master); > + clk_bulk_disable_unprepare(priv->num_clks, priv->clks); > + pinctrl_pm_select_sleep_state(dev); > + > + return 0; > +} > + > +static int __maybe_unused amlogic_i3c_runtime_resume(struct device *dev) > +{ > + struct svc_i3c_master *master = dev_get_drvdata(dev); > + struct amlogic_i3c_priv *priv = master->bsp_priv; > + int ret; > + > + pinctrl_pm_select_default_state(dev); > + ret = clk_bulk_prepare_enable(priv->num_clks, priv->clks); > + if (ret) > + return ret; > + > + svc_i3c_restore_regs(master); > + > + return 0; > +} > + > +static const struct dev_pm_ops amlogic_i3c_pm_ops = { > + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, > + pm_runtime_force_resume) > + SET_RUNTIME_PM_OPS(amlogic_i3c_runtime_suspend, > + amlogic_i3c_runtime_resume, NULL) > +}; > + > +static const struct amlogic_i3c_drvdata amlogic_i3c_data = { > + .fclk_rate_init = default_i3c_fclk_rate_init, > +}; > + > +static const struct amlogic_i3c_drvdata amlogic_i3c_ao_data = { > + .fclk_rate_init = ao_i3c_fclk_rate_init, > +}; > + > +static const struct svc_i3c_drvdata amlogic_a9_drvdata = { > + .quirks = SVC_I3C_QUIRK_FIFO_EMPTY | > + SVC_I3C_QUIRK_FALSE_SLVSTART | > + SVC_I3C_QUIRK_DAA_CORRUPT, > + .bsp_data = &amlogic_i3c_data, > +}; > + > +static const struct svc_i3c_drvdata amlogic_a9_ao_drvdata = { > + .quirks = SVC_I3C_QUIRK_FIFO_EMPTY | > + SVC_I3C_QUIRK_FALSE_SLVSTART | > + SVC_I3C_QUIRK_DAA_CORRUPT, > + .bsp_data = &amlogic_i3c_ao_data, > +}; > + > +static const struct of_device_id amlogic_i3c_of_match_tbl[] = { > + { .compatible = "amlogic,i3c-a9", .data = &amlogic_a9_drvdata }, > + { .compatible = "amlogic,i3c-ao-a9", .data = &amlogic_a9_ao_drvdata }, > + { /* sentinel */ }, > +}; > +MODULE_DEVICE_TABLE(of, amlogic_i3c_of_match_tbl); > + > +static struct platform_driver amlogic_i3c_master = { > + .probe = amlogic_i3c_probe, > + .remove = amlogic_i3c_remove, > + .driver = { > + .name = "amlogic-i3c-master", > + .of_match_table = amlogic_i3c_of_match_tbl, > + .pm = &amlogic_i3c_pm_ops, > + }, > +}; > +module_platform_driver(amlogic_i3c_master); > + > +MODULE_AUTHOR("Junyi Zhao "); > +MODULE_DESCRIPTION("Amlogic I3C master driver"); > +MODULE_LICENSE("GPL"); > _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic