From d06333b7a61863c338fecc434eab80101014ebd1 Mon Sep 17 00:00:00 2001 From: Benoit Cousson Date: Thu, 22 Dec 2011 15:56:36 +0100 Subject: [PATCH] i2c: OMAP: Add DT support for i2c controller Add initial DT support to retrieve the frequency using a DT attribute instead of the pdata pointer if of_node exist. Add documentation for omap i2c controller binding. Based on original patches from Manju and Grant. Signed-off-by: Benoit Cousson Cc: Ben Dooks Reviewed-by: Rob Herring Acked-by: Grant Likely Signed-off-by: Kevin Hilman --- .../devicetree/bindings/i2c/omap-i2c.txt | 30 ++++++ drivers/i2c/busses/i2c-omap.c | 102 ++++++++++++------ 2 files changed, 97 insertions(+), 35 deletions(-) create mode 100644 Documentation/devicetree/bindings/i2c/omap-i2c.txt diff --git a/Documentation/devicetree/bindings/i2c/omap-i2c.txt b/Documentation/devicetree/bindings/i2c/omap-i2c.txt new file mode 100644 index 000000000000..56564aa4b444 --- /dev/null +++ b/Documentation/devicetree/bindings/i2c/omap-i2c.txt @@ -0,0 +1,30 @@ +I2C for OMAP platforms + +Required properties : +- compatible : Must be "ti,omap3-i2c" or "ti,omap4-i2c" +- ti,hwmods : Must be "i2c", n being the instance number (1-based) +- #address-cells = <1>; +- #size-cells = <0>; + +Recommended properties : +- clock-frequency : Desired I2C bus clock frequency in Hz. Otherwise + the default 100 kHz frequency will be used. + +Optional properties: +- Child nodes conforming to i2c bus binding + +Note: Current implementation will fetch base address, irq and dma +from omap hwmod data base during device registration. +Future plan is to migrate hwmod data base contents into device tree +blob so that, all the required data will be used from device tree dts +file. + +Examples : + +i2c1: i2c@0 { + compatible = "ti,omap3-i2c"; + #address-cells = <1>; + #size-cells = <0>; + ti,hwmods = "i2c1"; + clock-frequency = <400000>; +}; diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c index e0733b776079..f713eac55047 100644 --- a/drivers/i2c/busses/i2c-omap.c +++ b/drivers/i2c/busses/i2c-omap.c @@ -37,6 +37,9 @@ #include #include #include +#include +#include +#include #include #include #include @@ -182,7 +185,9 @@ struct omap_i2c_dev { u32 latency; /* maximum mpu wkup latency */ void (*set_mpu_wkup_lat)(struct device *dev, long latency); - u32 speed; /* Speed of bus in Khz */ + u32 speed; /* Speed of bus in kHz */ + u32 dtrev; /* extra revision from DT */ + u32 flags; u16 cmd_err; u8 *buf; u8 *regs; @@ -266,11 +271,7 @@ static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg) static void omap_i2c_unidle(struct omap_i2c_dev *dev) { - struct omap_i2c_bus_platform_data *pdata; - - pdata = dev->dev->platform_data; - - if (pdata->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) { + if (dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) { omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, dev->pscstate); omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, dev->scllstate); @@ -291,13 +292,10 @@ static void omap_i2c_unidle(struct omap_i2c_dev *dev) static void omap_i2c_idle(struct omap_i2c_dev *dev) { - struct omap_i2c_bus_platform_data *pdata; u16 iv; - pdata = dev->dev->platform_data; - dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); - if (pdata->rev == OMAP_I2C_IP_VERSION_2) + if (dev->dtrev == OMAP_I2C_IP_VERSION_2) omap_i2c_write_reg(dev, OMAP_I2C_IP_V2_IRQENABLE_CLR, 1); else omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0); @@ -320,9 +318,6 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) unsigned long timeout; unsigned long internal_clk = 0; struct clk *fclk; - struct omap_i2c_bus_platform_data *pdata; - - pdata = dev->dev->platform_data; if (dev->rev >= OMAP_I2C_OMAP1_REV_2) { /* Disable I2C controller before soft reset */ @@ -373,7 +368,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) } omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); - if (pdata->flags & OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK) { + if (dev->flags & OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK) { /* * The I2C functional clock is the armxor_ck, so there's * no need to get "armxor_ck" separately. Now, if OMAP2420 @@ -397,7 +392,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) psc = fclk_rate / 12000000; } - if (!(pdata->flags & OMAP_I2C_FLAG_SIMPLE_CLOCK)) { + if (!(dev->flags & OMAP_I2C_FLAG_SIMPLE_CLOCK)) { /* * HSI2C controller internal clk rate should be 19.2 Mhz for @@ -406,7 +401,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) * The filter is iclk (fclk for HS) period. */ if (dev->speed > 400 || - pdata->flags & OMAP_I2C_FLAG_FORCE_19200_INT_CLK) + dev->flags & OMAP_I2C_FLAG_FORCE_19200_INT_CLK) internal_clk = 19200; else if (dev->speed > 100) internal_clk = 9600; @@ -475,7 +470,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) dev->errata = 0; - if (pdata->flags & OMAP_I2C_FLAG_APPLY_ERRATA_I207) + if (dev->flags & OMAP_I2C_FLAG_APPLY_ERRATA_I207) dev->errata |= I2C_OMAP_ERRATA_I207; /* Enable interrupts */ @@ -484,7 +479,7 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) OMAP_I2C_IE_AL) | ((dev->fifo_size) ? (OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0); omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate); - if (pdata->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) { + if (dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) { dev->pscstate = psc; dev->scllstate = scll; dev->sclhstate = sclh; @@ -804,9 +799,6 @@ omap_i2c_isr(int this_irq, void *dev_id) u16 bits; u16 stat, w; int err, count = 0; - struct omap_i2c_bus_platform_data *pdata; - - pdata = dev->dev->platform_data; if (pm_runtime_suspended(dev->dev)) return IRQ_NONE; @@ -873,7 +865,7 @@ complete: * Data reg in 2430, omap3 and * omap4 is 8 bit wide */ - if (pdata->flags & + if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { if (dev->buf_len) { *dev->buf++ = w >> 8; @@ -916,7 +908,7 @@ complete: * Data reg in 2430, omap3 and * omap4 is 8 bit wide */ - if (pdata->flags & + if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { if (dev->buf_len) { w |= *dev->buf++ << 8; @@ -963,6 +955,32 @@ static const struct i2c_algorithm omap_i2c_algo = { .functionality = omap_i2c_func, }; +#ifdef CONFIG_OF +static struct omap_i2c_bus_platform_data omap3_pdata = { + .rev = OMAP_I2C_IP_VERSION_1, + .flags = OMAP_I2C_FLAG_APPLY_ERRATA_I207 | + OMAP_I2C_FLAG_RESET_REGS_POSTIDLE | + OMAP_I2C_FLAG_BUS_SHIFT_2, +}; + +static struct omap_i2c_bus_platform_data omap4_pdata = { + .rev = OMAP_I2C_IP_VERSION_2, +}; + +static const struct of_device_id omap_i2c_of_match[] = { + { + .compatible = "ti,omap4-i2c", + .data = &omap4_pdata, + }, + { + .compatible = "ti,omap3-i2c", + .data = &omap3_pdata, + }, + { }, +}; +MODULE_DEVICE_TABLE(of, omap_i2c_of_match); +#endif + static int __devinit omap_i2c_probe(struct platform_device *pdev) { @@ -970,9 +988,10 @@ omap_i2c_probe(struct platform_device *pdev) struct i2c_adapter *adap; struct resource *mem, *irq, *ioarea; struct omap_i2c_bus_platform_data *pdata = pdev->dev.platform_data; + struct device_node *node = pdev->dev.of_node; + const struct of_device_id *match; irq_handler_t isr; int r; - u32 speed = 0; /* NOTE: driver uses the static register mapping */ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -999,15 +1018,24 @@ omap_i2c_probe(struct platform_device *pdev) goto err_release_region; } - if (pdata != NULL) { - speed = pdata->clkrate; + match = of_match_device(omap_i2c_of_match, &pdev->dev); + if (match) { + u32 freq = 100000; /* default to 100000 Hz */ + + pdata = match->data; + dev->dtrev = pdata->rev; + dev->flags = pdata->flags; + + of_property_read_u32(node, "clock-frequency", &freq); + /* convert DT freq value in Hz into kHz for speed */ + dev->speed = freq / 1000; + } else if (pdata != NULL) { + dev->speed = pdata->clkrate; + dev->flags = pdata->flags; dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat; - } else { - speed = 100; /* Default speed */ - dev->set_mpu_wkup_lat = NULL; + dev->dtrev = pdata->rev; } - dev->speed = speed; dev->dev = &pdev->dev; dev->irq = irq->start; dev->base = ioremap(mem->start, resource_size(mem)); @@ -1018,9 +1046,9 @@ omap_i2c_probe(struct platform_device *pdev) platform_set_drvdata(pdev, dev); - dev->reg_shift = (pdata->flags >> OMAP_I2C_FLAG_BUS_SHIFT__SHIFT) & 3; + dev->reg_shift = (dev->flags >> OMAP_I2C_FLAG_BUS_SHIFT__SHIFT) & 3; - if (pdata->rev == OMAP_I2C_IP_VERSION_2) + if (dev->dtrev == OMAP_I2C_IP_VERSION_2) dev->regs = (u8 *)reg_map_ip_v2; else dev->regs = (u8 *)reg_map_ip_v1; @@ -1033,7 +1061,7 @@ omap_i2c_probe(struct platform_device *pdev) if (dev->rev <= OMAP_I2C_REV_ON_3430) dev->errata |= I2C_OMAP3_1P153; - if (!(pdata->flags & OMAP_I2C_FLAG_NO_FIFO)) { + if (!(dev->flags & OMAP_I2C_FLAG_NO_FIFO)) { u16 s; /* Set up the fifo size - Get total size */ @@ -1056,7 +1084,7 @@ omap_i2c_probe(struct platform_device *pdev) /* calculate wakeup latency constraint for MPU */ if (dev->set_mpu_wkup_lat != NULL) dev->latency = (1000000 * dev->fifo_size) / - (1000 * speed / 8); + (1000 * dev->speed / 8); } /* reset ASAP, clearing any IRQs */ @@ -1072,7 +1100,7 @@ omap_i2c_probe(struct platform_device *pdev) } dev_info(dev->dev, "bus %d rev%d.%d.%d at %d kHz\n", pdev->id, - pdata->rev, dev->rev >> 4, dev->rev & 0xf, dev->speed); + dev->dtrev, dev->rev >> 4, dev->rev & 0xf, dev->speed); pm_runtime_put(dev->dev); @@ -1083,6 +1111,7 @@ omap_i2c_probe(struct platform_device *pdev) strlcpy(adap->name, "OMAP I2C adapter", sizeof(adap->name)); adap->algo = &omap_i2c_algo; adap->dev.parent = &pdev->dev; + adap->dev.of_node = pdev->dev.of_node; /* i2c device drivers may be active on return from add_adapter() */ adap->nr = pdev->id; @@ -1092,6 +1121,8 @@ omap_i2c_probe(struct platform_device *pdev) goto err_free_irq; } + of_i2c_register_devices(adap); + return 0; err_free_irq: @@ -1164,6 +1195,7 @@ static struct platform_driver omap_i2c_driver = { .name = "omap_i2c", .owner = THIS_MODULE, .pm = OMAP_I2C_PM_OPS, + .of_match_table = of_match_ptr(omap_i2c_of_match), }, }; -- 2.39.5