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Fri, 20 Sep 2024 12:09:32 +1200 Received: from chrisp-dl.ws.atlnz.lc (chrisp-dl.ws.atlnz.lc [10.33.22.30]) by pat.atlnz.lc (Postfix) with ESMTP id CC54A13EE6D; Fri, 20 Sep 2024 12:09:32 +1200 (NZST) Received: by chrisp-dl.ws.atlnz.lc (Postfix, from userid 1030) id C766328044C; Fri, 20 Sep 2024 12:09:32 +1200 (NZST) From: Chris Packham To: andi.shyti@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, tsbogend@alpha.franken.de Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, Chris Packham Subject: [PATCH v2 1/3] dt-bindings: i2c: Add RTL9300 I2C controller Date: Fri, 20 Sep 2024 12:09:28 +1200 Message-ID: <20240920000930.1828086-2-chris.packham@alliedtelesis.co.nz> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20240920000930.1828086-1-chris.packham@alliedtelesis.co.nz> References: <20240920000930.1828086-1-chris.packham@alliedtelesis.co.nz> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SEG-SpamProfiler-Analysis: v=2.4 cv=Id0kWnqa c=1 sm=1 tr=0 ts=66ecbd3c a=KLBiSEs5mFS1a/PbTCJxuA==:117 a=EaEq8P2WXUwA:10 a=gEfo2CItAAAA:8 a=NEAV23lmAAAA:8 a=VwQbUJbxAAAA:8 a=UgJECxHJAAAA:8 a=oDVXf_xxoK2ozSEg8_sA:9 a=3ZKOabzyN94A:10 a=sptkURWiP4Gy88Gu7hUp:22 a=-El7cUbtino8hM1DCn8D:22 X-SEG-SpamProfiler-Score: 0 x-atlnz-ls: pat Add dtschema for the I2C controller on the RTL9300 SoC. The I2C controllers on this SoC are part of the "switch" block which is represented here as a syscon node. The SCL pins are dependent on the I2C controller (GPIO8 for the first controller, GPIO 17 for the second). The SDA pins can be assigned to either one of the I2C controllers (but not both). Signed-off-by: Chris Packham --- Notes: Changes in v2: - Use reg property for controller registers - Remove global-control-offset (will be hard coded in driver) - Integrated the multiplexing function. Child nodes now represent the available SDA lines .../bindings/i2c/realtek,rtl9300-i2c.yaml | 82 +++++++++++++++++++ MAINTAINERS | 6 ++ 2 files changed, 88 insertions(+) create mode 100644 Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml diff --git a/Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml b/Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml new file mode 100644 index 000000000000..e8c37239b299 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml @@ -0,0 +1,82 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/i2c/realtek,rtl9300-i2c.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Realtek RTL I2C Controller + +maintainers: + - Chris Packham + +description: + The RTL9300 SoC has two I2C controllers. Each of these has an SCL line (which + if not-used for SCL can be a GPIO). There are 8 common SDA lines that can be + assigned to either I2C controller. + +properties: + compatible: + const: realtek,rtl9300-i2c + + reg: + description: Register offset and size this I2C controller. + +patternProperties: + '^i2c@[0-7]$': + $ref: /schemas/i2c/i2c-controller.yaml + unevaluatedProperties: false + + properties: + reg: + description: The SDA pin associated with the I2C bus. + maxItems: 1 + + required: + - reg + +unevaluatedProperties: false + +required: + - compatible + - reg + +examples: + - | + switch@1b000000 { + compatible = "realtek,rtl9302c-switch", "syscon", "simple-mfd"; + reg = <0x1b000000 0x10000>; + #address-cells = <1>; + #size-cells = <1>; + + i2c@36c { + compatible = "realtek,rtl9300-i2c"; + reg = <0x36c 0x14>; + clock-frequency = <100000>; + #address-cells = <1>; + #size-cells = <0>; + + i2c@0 { + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + gpio@20 { + compatible = "nxp,pca9555"; + gpio-controller; + #gpio-cells = <2>; + reg = <0x20>; + }; + }; + + i2c@2 { + reg = <2>; + #address-cells = <1>; + #size-cells = <0>; + gpio@20 { + compatible = "nxp,pca9555"; + gpio-controller; + #gpio-cells = <2>; + reg = <0x20>; + }; + }; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index f328373463b0..ccb1125444f4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -19887,6 +19887,12 @@ S: Maintained T: git https://github.com/pkshih/rtw.git F: drivers/net/wireless/realtek/rtl8xxxu/ +RTL9300 I2C DRIVER (rtl9300-i2c) +M: Chris Packham +L: linux-i2c@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml + RTRS TRANSPORT DRIVERS M: Md. Haris Iqbal M: Jack Wang From patchwork Fri Sep 20 00:09:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Packham X-Patchwork-Id: 1987608 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=alliedtelesis.co.nz header.i=@alliedtelesis.co.nz header.a=rsa-sha256 header.s=mail181024 header.b=GWW7mjFP; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=147.75.80.249; helo=am.mirrors.kernel.org; envelope-from=linux-i2c+bounces-6886-incoming=patchwork.ozlabs.org@vger.kernel.org; receiver=patchwork.ozlabs.org) Received: from am.mirrors.kernel.org (am.mirrors.kernel.org [147.75.80.249]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4X8t7F3BMkz1y1t for ; 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Fri, 20 Sep 2024 12:09:32 +1200 Received: from chrisp-dl.ws.atlnz.lc (chrisp-dl.ws.atlnz.lc [10.33.22.30]) by pat.atlnz.lc (Postfix) with ESMTP id D1D5513EE84; Fri, 20 Sep 2024 12:09:32 +1200 (NZST) Received: by chrisp-dl.ws.atlnz.lc (Postfix, from userid 1030) id CD31128044C; Fri, 20 Sep 2024 12:09:32 +1200 (NZST) From: Chris Packham To: andi.shyti@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, tsbogend@alpha.franken.de Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, Chris Packham Subject: [PATCH v2 2/3] i2c: Add driver for the RTL9300 I2C controller Date: Fri, 20 Sep 2024 12:09:29 +1200 Message-ID: <20240920000930.1828086-3-chris.packham@alliedtelesis.co.nz> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20240920000930.1828086-1-chris.packham@alliedtelesis.co.nz> References: <20240920000930.1828086-1-chris.packham@alliedtelesis.co.nz> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SEG-SpamProfiler-Analysis: v=2.4 cv=Id0kWnqa c=1 sm=1 tr=0 ts=66ecbd3c a=KLBiSEs5mFS1a/PbTCJxuA==:117 a=EaEq8P2WXUwA:10 a=jdP34snFAAAA:8 a=VwQbUJbxAAAA:8 a=UgJECxHJAAAA:8 a=ORF4czJjsXRIkPy9BnIA:9 a=3ZKOabzyN94A:10 a=jlphF6vWLdwq7oh3TaWq:22 a=-El7cUbtino8hM1DCn8D:22 X-SEG-SpamProfiler-Score: 0 x-atlnz-ls: pat Add support for the I2C controller on the RTL9300 SoC. There are two I2C controllers in the RTL9300 that are part of the Ethernet switch register block. Each of these controllers owns a SCL pin (GPIO8 for the fiorst I2C controller, GPIO17 for the second). There are 8 possible SDA pins (GPIO9-16) that can be assigned to either I2C controller. This relationship is represented in the device tree with a child node for each SDA line in use. This is based on the openwrt implementation[1] but has been significantly modified [1] - https://git.openwrt.org/?p=openwrt/openwrt.git;a=blob;f=target/linux/realtek/files-5.15/drivers/i2c/busses/i2c-rtl9300.c Signed-off-by: Chris Packham --- Notes: Changes in v2: - Replace a number of return 0; with tail calls - Add enum rtl9300_bus_freq - Use RTL9300_ prefix on new defines - Use reg property for register offset - Hard code RTL9300_I2C_MST_GLB_CTRL address as this does not need to come from DT binding - Use GENMASK() where appropriate - Propagate read/write errors through to rtl9300_i2c_smbus_xfer() - Don't error out on bad clock-frequency - Use devm_i2c_add_adapter() - Put more information in the commit message - Integrated multiplexing function, an adapter is created per SDA line MAINTAINERS | 1 + drivers/i2c/busses/Kconfig | 10 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-rtl9300.c | 421 +++++++++++++++++++++++++++++++ 4 files changed, 433 insertions(+) create mode 100644 drivers/i2c/busses/i2c-rtl9300.c diff --git a/MAINTAINERS b/MAINTAINERS index ccb1125444f4..9e123e9839a5 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -19892,6 +19892,7 @@ M: Chris Packham L: linux-i2c@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/i2c/realtek,rtl9300-i2c.yaml +F: drivers/i2c/busses/i2c-rtl9300.c RTRS TRANSPORT DRIVERS M: Md. Haris Iqbal diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index a22f9125322a..927b583002c7 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -1041,6 +1041,16 @@ config I2C_RK3X This driver can also be built as a module. If so, the module will be called i2c-rk3x. +config I2C_RTL9300 + tristate "Realtek RTL9300 I2C controller" + depends on MACH_REALTEK_RTL || COMPILE_TEST + help + Say Y here to include support for the I2C controller in Realtek + RTL9300 SoCs. + + This driver can also be built as a module. If so, the module will + be called i2c-rtl9300. + config I2C_RZV2M tristate "Renesas RZ/V2M adapter" depends on ARCH_RENESAS || COMPILE_TEST diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 78d0561339e5..ac2f9f22803c 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -102,6 +102,7 @@ obj-$(CONFIG_I2C_QCOM_GENI) += i2c-qcom-geni.o obj-$(CONFIG_I2C_QUP) += i2c-qup.o obj-$(CONFIG_I2C_RIIC) += i2c-riic.o obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o +obj-$(CONFIG_I2C_RTL9300) += i2c-rtl9300.o obj-$(CONFIG_I2C_RZV2M) += i2c-rzv2m.o obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o diff --git a/drivers/i2c/busses/i2c-rtl9300.c b/drivers/i2c/busses/i2c-rtl9300.c new file mode 100644 index 000000000000..ed2d888e8a9e --- /dev/null +++ b/drivers/i2c/busses/i2c-rtl9300.c @@ -0,0 +1,421 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include +#include +#include +#include +#include +#include + +enum rtl9300_bus_freq { + RTL9300_I2C_STD_FREQ, + RTL9300_I2C_FAST_FREQ, +}; + +struct rtl9300_i2c; + +struct rtl9300_i2c_chan { + struct i2c_adapter adap; + struct rtl9300_i2c *i2c; + enum rtl9300_bus_freq bus_freq; + u8 sda_pin; +}; + +#define RTL9300_I2C_MUX_NCHAN 8 + +struct rtl9300_i2c { + struct regmap *regmap; + struct device *dev; + struct rtl9300_i2c_chan chans[RTL9300_I2C_MUX_NCHAN]; + u32 reg_base; + u8 sda_pin; +}; + +#define RTL9300_I2C_MST_CTRL1 0x0 +#define RTL9300_I2C_MST_CTRL1_MEM_ADDR_OFS 8 +#define RTL9300_I2C_MST_CTRL1_MEM_ADDR_MASK GENMASK(31, 8) +#define RTL9300_I2C_MST_CTRL1_SDA_OUT_SEL_OFS 4 +#define RTL9300_I2C_MST_CTRL1_SDA_OUT_SEL_MASK GENMASK(6, 4) +#define RTL9300_I2C_MST_CTRL1_GPIO_SCL_SEL BIT(3) +#define RTL9300_I2C_MST_CTRL1_RWOP BIT(2) +#define RTL9300_I2C_MST_CTRL1_I2C_FAIL BIT(1) +#define RTL9300_I2C_MST_CTRL1_I2C_TRIG BIT(0) +#define RTL9300_I2C_MST_CTRL2 0x4 +#define RTL9300_I2C_MST_CTRL2_RD_MODE BIT(15) +#define RTL9300_I2C_MST_CTRL2_DEV_ADDR_OFS 8 +#define RTL9300_I2C_MST_CTRL2_DEV_ADDR_MASK GENMASK(14, 8) +#define RTL9300_I2C_MST_CTRL2_DATA_WIDTH_OFS 4 +#define RTL9300_I2C_MST_CTRL2_DATA_WIDTH_MASK GENMASK(7, 4) +#define RTL9300_I2C_MST_CTRL2_MEM_ADDR_WIDTH_OFS 2 +#define RTL9300_I2C_MST_CTRL2_MEM_ADDR_WIDTH_MASK GENMASK(3, 2) +#define RTL9300_I2C_MST_CTRL2_SCL_FREQ_OFS 0 +#define RTL9300_I2C_MST_CTRL2_SCL_FREQ_MASK GENMASK(1, 0) +#define RTL9300_I2C_MST_DATA_WORD0 0x8 +#define RTL9300_I2C_MST_DATA_WORD1 0xc +#define RTL9300_I2C_MST_DATA_WORD2 0x10 +#define RTL9300_I2C_MST_DATA_WORD3 0x14 + +#define RTL9300_I2C_MST_GLB_CTRL 0x384 + +DEFINE_MUTEX(i2c_lock); + +static int rtl9300_i2c_reg_addr_set(struct rtl9300_i2c *i2c, u32 reg, u16 len) +{ + u32 val, mask; + int ret; + + val = len << RTL9300_I2C_MST_CTRL2_MEM_ADDR_WIDTH_OFS; + mask = RTL9300_I2C_MST_CTRL2_MEM_ADDR_WIDTH_MASK; + + ret = regmap_update_bits(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL2, mask, val); + if (ret) + return ret; + + val = reg << RTL9300_I2C_MST_CTRL1_MEM_ADDR_OFS; + mask = RTL9300_I2C_MST_CTRL1_MEM_ADDR_MASK; + + return regmap_update_bits(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL1, mask, val); +} + +static int rtl9300_i2c_config_io(struct rtl9300_i2c *i2c, u8 sda_pin) +{ + int ret; + u32 val, mask; + + ret = regmap_update_bits(i2c->regmap, RTL9300_I2C_MST_GLB_CTRL, BIT(sda_pin), BIT(sda_pin)); + if (ret) + return ret; + + val = (sda_pin << RTL9300_I2C_MST_CTRL1_SDA_OUT_SEL_OFS) | + RTL9300_I2C_MST_CTRL1_GPIO_SCL_SEL; + mask = RTL9300_I2C_MST_CTRL1_SDA_OUT_SEL_MASK | RTL9300_I2C_MST_CTRL1_GPIO_SCL_SEL; + + return regmap_update_bits(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL1, mask, val); +} + +static int rtl9300_i2c_config_xfer(struct rtl9300_i2c *i2c, struct rtl9300_i2c_chan *chan, + u16 addr, u16 len) +{ + u32 val, mask; + + val = chan->bus_freq << RTL9300_I2C_MST_CTRL2_SCL_FREQ_OFS; + mask = RTL9300_I2C_MST_CTRL2_SCL_FREQ_MASK; + + val |= addr << RTL9300_I2C_MST_CTRL2_DEV_ADDR_OFS; + mask |= RTL9300_I2C_MST_CTRL2_DEV_ADDR_MASK; + + val |= ((len - 1) & 0xf) << RTL9300_I2C_MST_CTRL2_DATA_WIDTH_OFS; + mask |= RTL9300_I2C_MST_CTRL2_DATA_WIDTH_MASK; + + mask |= RTL9300_I2C_MST_CTRL2_RD_MODE; + + return regmap_update_bits(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL2, mask, val); +} + +static int rtl9300_i2c_read(struct rtl9300_i2c *i2c, u8 *buf, int len) +{ + u32 vals[4] = {}; + int i, ret; + + if (len > 16) + return -EIO; + + ret = regmap_bulk_read(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_DATA_WORD0, + vals, ARRAY_SIZE(vals)); + if (ret) + return ret; + + for (i = 0; i < len; i++) { + buf[i] = vals[i/4] & 0xff; + vals[i/4] >>= 8; + } + + return 0; +} + +static int rtl9300_i2c_write(struct rtl9300_i2c *i2c, u8 *buf, int len) +{ + u32 vals[4] = {}; + int i; + + if (len > 16) + return -EIO; + + for (i = 0; i < len; i++) { + if (i % 4 == 0) + vals[i/4] = 0; + vals[i/4] <<= 8; + vals[i/4] |= buf[i]; + } + + return regmap_bulk_write(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_DATA_WORD0, + vals, ARRAY_SIZE(vals)); +} + +static int rtl9300_i2c_writel(struct rtl9300_i2c *i2c, u32 data) +{ + return regmap_write(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_DATA_WORD0, data); +} + +static int rtl9300_i2c_execute_xfer(struct rtl9300_i2c *i2c, char read_write, + int size, union i2c_smbus_data *data, int len) +{ + u32 val, mask; + int ret; + + val = read_write == I2C_SMBUS_WRITE ? RTL9300_I2C_MST_CTRL1_RWOP : 0; + mask = RTL9300_I2C_MST_CTRL1_RWOP; + + val |= RTL9300_I2C_MST_CTRL1_I2C_TRIG; + mask |= RTL9300_I2C_MST_CTRL1_I2C_TRIG; + + ret = regmap_update_bits(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL1, mask, val); + if (ret) + return ret; + + ret = regmap_read_poll_timeout(i2c->regmap, i2c->reg_base + RTL9300_I2C_MST_CTRL1, + val, !(val & RTL9300_I2C_MST_CTRL1_I2C_TRIG), 100, 2000); + if (ret) + return ret; + + if (val & RTL9300_I2C_MST_CTRL1_I2C_FAIL) + return -EIO; + + if (read_write == I2C_SMBUS_READ) { + if (size == I2C_SMBUS_BYTE || size == I2C_SMBUS_BYTE_DATA) { + ret = regmap_read(i2c->regmap, + i2c->reg_base + RTL9300_I2C_MST_DATA_WORD0, &val); + if (ret) + return ret; + data->byte = val & 0xff; + } else if (size == I2C_SMBUS_WORD_DATA) { + ret = regmap_read(i2c->regmap, + i2c->reg_base + RTL9300_I2C_MST_DATA_WORD0, &val); + if (ret) + return ret; + data->word = val & 0xffff; + } else { + ret = rtl9300_i2c_read(i2c, &data->block[0], len); + if (ret) + return ret; + } + } + + return 0; +} + +static int rtl9300_i2c_smbus_xfer(struct i2c_adapter *adap, u16 addr, + unsigned short flags, char read_write, + u8 command, int size, union i2c_smbus_data *data) +{ + struct rtl9300_i2c_chan *chan = i2c_get_adapdata(adap); + struct rtl9300_i2c *i2c = chan->i2c; + int len = 0, ret; + + mutex_lock(&i2c_lock); + if (chan->sda_pin != i2c->sda_pin) { + ret = rtl9300_i2c_config_io(i2c, chan->sda_pin); + if (ret) + goto out_unlock; + i2c->sda_pin = chan->sda_pin; + } + + switch (size) { + case I2C_SMBUS_QUICK: + ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 0); + if (ret) + goto out_unlock; + ret = rtl9300_i2c_reg_addr_set(i2c, 0, 0); + if (ret) + goto out_unlock; + break; + + case I2C_SMBUS_BYTE: + if (read_write == I2C_SMBUS_WRITE) { + ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 0); + if (ret) + goto out_unlock; + ret = rtl9300_i2c_reg_addr_set(i2c, command, 1); + if (ret) + goto out_unlock; + } else { + ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 1); + if (ret) + goto out_unlock; + ret = rtl9300_i2c_reg_addr_set(i2c, 0, 0); + if (ret) + goto out_unlock; + } + break; + + case I2C_SMBUS_BYTE_DATA: + ret = rtl9300_i2c_reg_addr_set(i2c, command, 1); + if (ret) + goto out_unlock; + ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 1); + if (ret) + goto out_unlock; + if (read_write == I2C_SMBUS_WRITE) { + ret = rtl9300_i2c_writel(i2c, data->byte); + if (ret) + goto out_unlock; + } + break; + + case I2C_SMBUS_WORD_DATA: + ret = rtl9300_i2c_reg_addr_set(i2c, command, 1); + if (ret) + goto out_unlock; + ret = rtl9300_i2c_config_xfer(i2c, chan, addr, 2); + if (ret) + goto out_unlock; + if (read_write == I2C_SMBUS_WRITE) { + ret = rtl9300_i2c_writel(i2c, data->word); + if (ret) + goto out_unlock; + } + break; + + case I2C_SMBUS_BLOCK_DATA: + ret = rtl9300_i2c_reg_addr_set(i2c, command, 1); + if (ret) + goto out_unlock; + ret = rtl9300_i2c_config_xfer(i2c, chan, addr, data->block[0]); + if (ret) + goto out_unlock; + if (read_write == I2C_SMBUS_WRITE) { + ret = rtl9300_i2c_write(i2c, &data->block[1], data->block[0]); + if (ret) + goto out_unlock; + } + len = data->block[0]; + break; + + default: + dev_err(&adap->dev, "Unsupported transaction %d\n", size); + ret = -EOPNOTSUPP; + goto out_unlock; + } + + ret = rtl9300_i2c_execute_xfer(i2c, read_write, size, data, len); + +out_unlock: + mutex_unlock(&i2c_lock); + + return ret; +} + +static u32 rtl9300_i2c_func(struct i2c_adapter *a) +{ + return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | + I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | + I2C_FUNC_SMBUS_BLOCK_DATA; +} + +static const struct i2c_algorithm rtl9300_i2c_algo = { + .smbus_xfer = rtl9300_i2c_smbus_xfer, + .functionality = rtl9300_i2c_func, +}; + +struct i2c_adapter_quirks rtl9300_i2c_quirks = { + .flags = I2C_AQ_NO_CLK_STRETCH, + .max_read_len = 16, + .max_write_len = 16, +}; + +static int rtl9300_i2c_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rtl9300_i2c_chan *chan; + struct rtl9300_i2c *i2c; + struct i2c_adapter *adap; + u32 clock_freq, sda_pin; + int ret, i = 0; + struct fwnode_handle *child; + + i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL); + if (!i2c) + return -ENOMEM; + + i2c->regmap = syscon_node_to_regmap(dev->parent->of_node); + if (IS_ERR(i2c->regmap)) + return PTR_ERR(i2c->regmap); + i2c->dev = dev; + + ret = device_property_read_u32(dev, "reg", &i2c->reg_base); + if (ret) + return ret; + + platform_set_drvdata(pdev, i2c); + + if (device_get_child_node_count(dev) >= RTL9300_I2C_MUX_NCHAN) + return dev_err_probe(dev, -EINVAL, "Too many channels\n"); + + device_for_each_child_node(dev, child) { + chan = &i2c->chans[i]; + adap = &chan->adap; + + ret = fwnode_property_read_u32(child, "reg", &sda_pin); + if (ret) + return ret; + + ret = fwnode_property_read_u32(child, "clock-frequency", &clock_freq); + if (ret) + clock_freq = I2C_MAX_STANDARD_MODE_FREQ; + + switch (clock_freq) { + case I2C_MAX_STANDARD_MODE_FREQ: + chan->bus_freq = RTL9300_I2C_STD_FREQ; + break; + + case I2C_MAX_FAST_MODE_FREQ: + chan->bus_freq = RTL9300_I2C_FAST_FREQ; + break; + default: + dev_warn(i2c->dev, "SDA%d clock-frequency %d not supported using default\n", + sda_pin, clock_freq); + break; + } + + chan->sda_pin = sda_pin; + chan->i2c = i2c; + adap = &i2c->chans[i].adap; + adap->owner = THIS_MODULE; + adap->algo = &rtl9300_i2c_algo; + adap->quirks = &rtl9300_i2c_quirks; + adap->retries = 3; + adap->dev.parent = dev; + i2c_set_adapdata(adap, chan); + adap->dev.of_node = to_of_node(child); + snprintf(adap->name, sizeof(adap->name), "%s SDA%d\n", dev_name(dev), sda_pin); + i++; + + ret = devm_i2c_add_adapter(dev, adap); + if (ret) + return ret; + } + i2c->sda_pin = 0xff; + + return 0; +} + +static const struct of_device_id i2c_rtl9300_dt_ids[] = { + { .compatible = "realtek,rtl9300-i2c" }, + {} +}; +MODULE_DEVICE_TABLE(of, i2c_rtl9300_dt_ids); + +static struct platform_driver rtl9300_i2c_driver = { + .probe = rtl9300_i2c_probe, + .driver = { + .name = "i2c-rtl9300", + .of_match_table = i2c_rtl9300_dt_ids, + }, +}; + +module_platform_driver(rtl9300_i2c_driver); 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Signed-off-by: Chris Packham --- Notes: Changes in v2: - Use reg property arch/mips/boot/dts/realtek/rtl930x.dtsi | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/arch/mips/boot/dts/realtek/rtl930x.dtsi b/arch/mips/boot/dts/realtek/rtl930x.dtsi index cf1b38b6c353..cc43025cd46c 100644 --- a/arch/mips/boot/dts/realtek/rtl930x.dtsi +++ b/arch/mips/boot/dts/realtek/rtl930x.dtsi @@ -33,12 +33,30 @@ lx_clk: clock-175mhz { switch0: switch@1b000000 { compatible = "realtek,rtl9302c-switch", "syscon", "simple-mfd"; reg = <0x1b000000 0x10000>; + #address-cells = <1>; + #size-cells = <1>; reboot { compatible = "syscon-reboot"; offset = <0x0c>; value = <0x01>; }; + + i2c0: i2c@36c { + compatible = "realtek,rtl9300-i2c"; + reg = <0x36c 0x14>; + status = "disabled"; + #address-cells = <1>; + #size-cells = <0>; + }; + + i2c1: i2c@388 { + compatible = "realtek,rtl9300-i2c"; + reg = <0x388 0x14>; + status = "disabled"; + #address-cells = <1>; + #size-cells = <0>; + }; }; };