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{
    "id": 2215654,
    "url": "http://patchwork.ozlabs.org/api/patches/2215654/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260325011852.19079-3-wanghongliang@loongson.cn/",
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        "id": 35,
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        "name": "Linux I2C development",
        "link_name": "linux-i2c",
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    "msgid": "<20260325011852.19079-3-wanghongliang@loongson.cn>",
    "list_archive_url": null,
    "date": "2026-03-25T01:18:52",
    "name": "[v1,2/2] i2c: ls2x: Add clock-input and clock-div properties parsing",
    "commit_ref": null,
    "pull_url": null,
    "state": "changes-requested",
    "archived": false,
    "hash": "4fa3073d11aeee31b65b4f71df6838887c625bce",
    "submitter": {
        "id": 92622,
        "url": "http://patchwork.ozlabs.org/api/people/92622/?format=api",
        "name": "Hongliang Wang",
        "email": "wanghongliang@loongson.cn"
    },
    "delegate": {
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        "url": "http://patchwork.ozlabs.org/api/users/149066/?format=api",
        "username": "cazzacarna",
        "first_name": "Andi",
        "last_name": "Shyti",
        "email": "andi.shyti@kernel.org"
    },
    "mbox": "http://patchwork.ozlabs.org/project/linux-i2c/patch/20260325011852.19079-3-wanghongliang@loongson.cn/mbox/",
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        {
            "id": 497370,
            "url": "http://patchwork.ozlabs.org/api/series/497370/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/list/?series=497370",
            "date": "2026-03-25T01:18:52",
            "name": "i2c: ls2x: Add clock- related properties and parsing",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/497370/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2215654/comments/",
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    "tags": {},
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        "From": "Hongliang Wang <wanghongliang@loongson.cn>",
        "To": "Binbin Zhou <zhoubinbin@loongson.cn>,\n\tAndi Shyti <andi.shyti@kernel.org>,\n\tRob Herring <robh@kernel.org>,\n\tKrzysztof Kozlowski <krzk+dt@kernel.org>,\n\tConor Dooley <conor+dt@kernel.org>,\n\tHongliang Wang <wanghongliang@loongson.cn>",
        "Cc": "linux-i2c@vger.kernel.org,\n\tdevicetree@vger.kernel.org,\n\tloongarch@lists.linux.dev",
        "Subject": "[PATCH v1 2/2] i2c: ls2x: Add clock-input and clock-div properties\n parsing",
        "Date": "Wed, 25 Mar 2026 09:18:52 +0800",
        "Message-Id": "<20260325011852.19079-3-wanghongliang@loongson.cn>",
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        "References": "<20260325011852.19079-1-wanghongliang@loongson.cn>",
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    },
    "content": "From: wanghongliang <wanghongliang@loongson.cn>\n\nOn 3A/7A/2K platform, the input clock of i2c controller and\nthe divisor of input clock maybe different, so define the\nclock-input and clock-div properties in i2c controller node\ndescription of dts or acpi. clock-input describes the input\nclock of i2c controller and clock-div describes the clock\ndivisor of the input clock.\n\nThe formulas is\nPrcescale = (clock-input * 10) / (clock-div * t->bus_freq_hz) - 1\n\nThe value of clock-input and clock-div on different platforms are\nlisted below:\n\n1.7A1000/7A2000:\nclock-input = 80MHZ\nclock-div = 50\n\n2.3A5000/3C5000/3A6000/3C6000:\nclock-input = 100MHZ\nclock-div = 40\n\n3.2K0500/2K1000LA/2K2000:\nclock-input = 100MHZ\nclock-div = 40\n\n4.2K3000:\nclock-input = 100MHZ\nclock-div = 55\n\nSigned-off-by: wanghongliang <wanghongliang@loongson.cn>\n---\n drivers/i2c/busses/i2c-ls2x.c | 7 ++++++-\n 1 file changed, 6 insertions(+), 1 deletion(-)",
    "diff": "diff --git a/drivers/i2c/busses/i2c-ls2x.c b/drivers/i2c/busses/i2c-ls2x.c\nindex b475dd27b7af..08c242e5fd75 100644\n--- a/drivers/i2c/busses/i2c-ls2x.c\n+++ b/drivers/i2c/busses/i2c-ls2x.c\n@@ -96,6 +96,7 @@ static irqreturn_t ls2x_i2c_isr(int this_irq, void *dev_id)\n static void ls2x_i2c_adjust_bus_speed(struct ls2x_i2c_priv *priv)\n {\n \tu16 val;\n+\tu32 pclk, div;\n \tstruct i2c_timings *t = &priv->i2c_t;\n \tstruct device *dev = priv->adapter.dev.parent;\n \tu32 acpi_speed = i2c_acpi_find_bus_speed(dev);\n@@ -107,12 +108,16 @@ static void ls2x_i2c_adjust_bus_speed(struct ls2x_i2c_priv *priv)\n \telse\n \t\tt->bus_freq_hz = LS2X_I2C_FREQ_STD;\n \n+\tif (!device_property_read_u32(dev, \"clock-input\", &pclk) &&\n+\t    !device_property_read_u32(dev, \"clock-div\", &div) && div != 0)\n+\t\tval = (pclk * 10) / (div * t->bus_freq_hz) - 1;\n+\telse\n+\t\tval = LS2X_I2C_PCLK_FREQ / (5 * t->bus_freq_hz) - 1;\n \t/*\n \t * According to the chip manual, we can only access the registers as bytes,\n \t * otherwise the high bits will be truncated.\n \t * So set the I2C frequency with a sequential writeb() instead of writew().\n \t */\n-\tval = LS2X_I2C_PCLK_FREQ / (5 * t->bus_freq_hz) - 1;\n \twriteb(FIELD_GET(GENMASK(7, 0), val), priv->base + I2C_LS2X_PRER_LO);\n \twriteb(FIELD_GET(GENMASK(15, 8), val), priv->base + I2C_LS2X_PRER_HI);\n }\n",
    "prefixes": [
        "v1",
        "2/2"
    ]
}