3  * Driver for I2C adapter in Rockchip RK3xxx SoC
11 #include <linux/i2c.h>
83  * struct i2c_spec_values - I2C specification values for various modes
163  * @grf_offset: offset inside the grf regmap for setting the i2c type
164  * @calc_timings: Callback function for i2c timing information calculated
174  * @adap: corresponding I2C adapter
180  * @clk_rate_nb: i2c clk rate change notify
181  * @t: I2C known timing information
182  * @lock: spinlock for the i2c bus
183  * @wait: the waitqueue to wait for i2c transfer
185  * @msg: current i2c message
186  * @addr: addr of i2c slave device
187  * @mode: mode of i2c transfer
189  * @state: state of i2c transfer
191  * @error: error code for i2c transfer
218 	/* I2C state machine */
224 static inline void i2c_writel(struct rk3x_i2c *i2c, u32 value,  in i2c_writel()  argument
227 	writel(value, i2c->regs + offset);  in i2c_writel()
230 static inline u32 i2c_readl(struct rk3x_i2c *i2c, unsigned int offset)  in i2c_readl()  argument
232 	return readl(i2c->regs + offset);  in i2c_readl()
236 static inline void rk3x_i2c_clean_ipd(struct rk3x_i2c *i2c)  in rk3x_i2c_clean_ipd()  argument
238 	i2c_writel(i2c, REG_INT_ALL, REG_IPD);  in rk3x_i2c_clean_ipd()
243  * @i2c: target controller data
245 static void rk3x_i2c_start(struct rk3x_i2c *i2c)  in rk3x_i2c_start()  argument
247 	u32 val = i2c_readl(i2c, REG_CON) & REG_CON_TUNING_MASK;  in rk3x_i2c_start()
249 	i2c_writel(i2c, REG_INT_START, REG_IEN);  in rk3x_i2c_start()
252 	val |= REG_CON_EN | REG_CON_MOD(i2c->mode) | REG_CON_START;  in rk3x_i2c_start()
255 	if (!(i2c->msg->flags & I2C_M_IGNORE_NAK))  in rk3x_i2c_start()
258 	i2c_writel(i2c, val, REG_CON);  in rk3x_i2c_start()
263  * @i2c: target controller data
266 static void rk3x_i2c_stop(struct rk3x_i2c *i2c, int error)  in rk3x_i2c_stop()  argument
270 	i2c->processed = 0;  in rk3x_i2c_stop()
271 	i2c->msg = NULL;  in rk3x_i2c_stop()
272 	i2c->error = error;  in rk3x_i2c_stop()
274 	if (i2c->is_last_msg) {  in rk3x_i2c_stop()
276 		i2c_writel(i2c, REG_INT_STOP, REG_IEN);  in rk3x_i2c_stop()
278 		i2c->state = STATE_STOP;  in rk3x_i2c_stop()
280 		ctrl = i2c_readl(i2c, REG_CON);  in rk3x_i2c_stop()
282 		i2c_writel(i2c, ctrl, REG_CON);  in rk3x_i2c_stop()
285 		i2c->busy = false;  in rk3x_i2c_stop()
286 		i2c->state = STATE_IDLE;  in rk3x_i2c_stop()
293 		ctrl = i2c_readl(i2c, REG_CON) & REG_CON_TUNING_MASK;  in rk3x_i2c_stop()
294 		i2c_writel(i2c, ctrl, REG_CON);  in rk3x_i2c_stop()
297 		wake_up(&i2c->wait);  in rk3x_i2c_stop()
302  * rk3x_i2c_prepare_read - Setup a read according to i2c->msg
303  * @i2c: target controller data
305 static void rk3x_i2c_prepare_read(struct rk3x_i2c *i2c)  in rk3x_i2c_prepare_read()  argument
307 	unsigned int len = i2c->msg->len - i2c->processed;  in rk3x_i2c_prepare_read()
310 	con = i2c_readl(i2c, REG_CON);  in rk3x_i2c_prepare_read()
324 	if (i2c->processed != 0) {  in rk3x_i2c_prepare_read()
329 	i2c_writel(i2c, con, REG_CON);  in rk3x_i2c_prepare_read()
330 	i2c_writel(i2c, len, REG_MRXCNT);  in rk3x_i2c_prepare_read()
334  * rk3x_i2c_fill_transmit_buf - Fill the transmit buffer with data from i2c->msg
335  * @i2c: target controller data
337 static void rk3x_i2c_fill_transmit_buf(struct rk3x_i2c *i2c)  in rk3x_i2c_fill_transmit_buf()  argument
347 			if ((i2c->processed == i2c->msg->len) && (cnt != 0))  in rk3x_i2c_fill_transmit_buf()
350 			if (i2c->processed == 0 && cnt == 0)  in rk3x_i2c_fill_transmit_buf()
351 				byte = (i2c->addr & 0x7f) << 1;  in rk3x_i2c_fill_transmit_buf()
353 				byte = i2c->msg->buf[i2c->processed++];  in rk3x_i2c_fill_transmit_buf()
359 		i2c_writel(i2c, val, TXBUFFER_BASE + 4 * i);  in rk3x_i2c_fill_transmit_buf()
361 		if (i2c->processed == i2c->msg->len)  in rk3x_i2c_fill_transmit_buf()
365 	i2c_writel(i2c, cnt, REG_MTXCNT);  in rk3x_i2c_fill_transmit_buf()
371 static void rk3x_i2c_handle_start(struct rk3x_i2c *i2c, unsigned int ipd)  in rk3x_i2c_handle_start()  argument
374 		rk3x_i2c_stop(i2c, -EIO);  in rk3x_i2c_handle_start()
375 		dev_warn(i2c->dev, "unexpected irq in START: 0x%x\n", ipd);  in rk3x_i2c_handle_start()
376 		rk3x_i2c_clean_ipd(i2c);  in rk3x_i2c_handle_start()
381 	i2c_writel(i2c, REG_INT_START, REG_IPD);  in rk3x_i2c_handle_start()
384 	i2c_writel(i2c, i2c_readl(i2c, REG_CON) & ~REG_CON_START, REG_CON);  in rk3x_i2c_handle_start()
387 	if (i2c->mode == REG_CON_MOD_TX) {  in rk3x_i2c_handle_start()
388 		i2c_writel(i2c, REG_INT_MBTF | REG_INT_NAKRCV, REG_IEN);  in rk3x_i2c_handle_start()
389 		i2c->state = STATE_WRITE;  in rk3x_i2c_handle_start()
390 		rk3x_i2c_fill_transmit_buf(i2c);  in rk3x_i2c_handle_start()
393 		i2c_writel(i2c, REG_INT_MBRF | REG_INT_NAKRCV, REG_IEN);  in rk3x_i2c_handle_start()
394 		i2c->state = STATE_READ;  in rk3x_i2c_handle_start()
395 		rk3x_i2c_prepare_read(i2c);  in rk3x_i2c_handle_start()
399 static void rk3x_i2c_handle_write(struct rk3x_i2c *i2c, unsigned int ipd)  in rk3x_i2c_handle_write()  argument
402 		rk3x_i2c_stop(i2c, -EIO);  in rk3x_i2c_handle_write()
403 		dev_err(i2c->dev, "unexpected irq in WRITE: 0x%x\n", ipd);  in rk3x_i2c_handle_write()
404 		rk3x_i2c_clean_ipd(i2c);  in rk3x_i2c_handle_write()
409 	i2c_writel(i2c, REG_INT_MBTF, REG_IPD);  in rk3x_i2c_handle_write()
412 	if (i2c->processed == i2c->msg->len)  in rk3x_i2c_handle_write()
413 		rk3x_i2c_stop(i2c, i2c->error);  in rk3x_i2c_handle_write()
415 		rk3x_i2c_fill_transmit_buf(i2c);  in rk3x_i2c_handle_write()
418 static void rk3x_i2c_handle_read(struct rk3x_i2c *i2c, unsigned int ipd)  in rk3x_i2c_handle_read()  argument
421 	unsigned int len = i2c->msg->len - i2c->processed;  in rk3x_i2c_handle_read()
430 	i2c_writel(i2c, REG_INT_MBRF | REG_INT_START, REG_IPD);  in rk3x_i2c_handle_read()
439 			val = i2c_readl(i2c, RXBUFFER_BASE + (i / 4) * 4);  in rk3x_i2c_handle_read()
442 		i2c->msg->buf[i2c->processed++] = byte;  in rk3x_i2c_handle_read()
446 	if (i2c->processed == i2c->msg->len)  in rk3x_i2c_handle_read()
447 		rk3x_i2c_stop(i2c, i2c->error);  in rk3x_i2c_handle_read()
449 		rk3x_i2c_prepare_read(i2c);  in rk3x_i2c_handle_read()
452 static void rk3x_i2c_handle_stop(struct rk3x_i2c *i2c, unsigned int ipd)  in rk3x_i2c_handle_stop()  argument
457 		rk3x_i2c_stop(i2c, -EIO);  in rk3x_i2c_handle_stop()
458 		dev_err(i2c->dev, "unexpected irq in STOP: 0x%x\n", ipd);  in rk3x_i2c_handle_stop()
459 		rk3x_i2c_clean_ipd(i2c);  in rk3x_i2c_handle_stop()
464 	i2c_writel(i2c, REG_INT_STOP, REG_IPD);  in rk3x_i2c_handle_stop()
467 	con = i2c_readl(i2c, REG_CON);  in rk3x_i2c_handle_stop()
469 	i2c_writel(i2c, con, REG_CON);  in rk3x_i2c_handle_stop()
471 	i2c->busy = false;  in rk3x_i2c_handle_stop()
472 	i2c->state = STATE_IDLE;  in rk3x_i2c_handle_stop()
475 	wake_up(&i2c->wait);  in rk3x_i2c_handle_stop()
480 	struct rk3x_i2c *i2c = dev_id;  in rk3x_i2c_irq()  local
483 	spin_lock(&i2c->lock);  in rk3x_i2c_irq()
485 	ipd = i2c_readl(i2c, REG_IPD);  in rk3x_i2c_irq()
486 	if (i2c->state == STATE_IDLE) {  in rk3x_i2c_irq()
487 		dev_warn(i2c->dev, "irq in STATE_IDLE, ipd = 0x%x\n", ipd);  in rk3x_i2c_irq()
488 		rk3x_i2c_clean_ipd(i2c);  in rk3x_i2c_irq()
492 	dev_dbg(i2c->dev, "IRQ: state %d, ipd: %x\n", i2c->state, ipd);  in rk3x_i2c_irq()
503 		i2c_writel(i2c, REG_INT_NAKRCV, REG_IPD);  in rk3x_i2c_irq()
507 		if (!(i2c->msg->flags & I2C_M_IGNORE_NAK))  in rk3x_i2c_irq()
508 			rk3x_i2c_stop(i2c, -ENXIO);  in rk3x_i2c_irq()
515 	switch (i2c->state) {  in rk3x_i2c_irq()
517 		rk3x_i2c_handle_start(i2c, ipd);  in rk3x_i2c_irq()
520 		rk3x_i2c_handle_write(i2c, ipd);  in rk3x_i2c_irq()
523 		rk3x_i2c_handle_read(i2c, ipd);  in rk3x_i2c_irq()
526 		rk3x_i2c_handle_stop(i2c, ipd);  in rk3x_i2c_irq()
533 	spin_unlock(&i2c->lock);  in rk3x_i2c_irq()
538  * rk3x_i2c_get_spec - Get timing values of I2C specification
555  * @clk_rate: I2C input clock rate
556  * @t: Known I2C timing information
592 	 *		meet I2C specification, should include fall time.  in rk3x_i2c_v0_calc_timings()
594 	 *		meet I2C specification, should include rise time.  in rk3x_i2c_v0_calc_timings()
596 	 *		I2C specification.  in rk3x_i2c_v0_calc_timings()
599 	 *	 This is because the i2c host on Rockchip holds the data line  in rk3x_i2c_v0_calc_timings()
715  * @clk_rate: I2C input clock rate
716  * @t: Known I2C timing information
771 	 *	       meet I2C specification, should include fall time.  in rk3x_i2c_v1_calc_timings()
773 	 *	        meet I2C specification, should include rise time.  in rk3x_i2c_v1_calc_timings()
790 	 * hardware would not output the i2c clk.  in rk3x_i2c_v1_calc_timings()
872 static void rk3x_i2c_adapt_div(struct rk3x_i2c *i2c, unsigned long clk_rate)  in rk3x_i2c_adapt_div()  argument
874 	struct i2c_timings *t = &i2c->t;  in rk3x_i2c_adapt_div()
881 	ret = i2c->soc_data->calc_timings(clk_rate, t, &calc);  in rk3x_i2c_adapt_div()
884 	clk_enable(i2c->pclk);  in rk3x_i2c_adapt_div()
886 	spin_lock_irqsave(&i2c->lock, flags);  in rk3x_i2c_adapt_div()
887 	val = i2c_readl(i2c, REG_CON);  in rk3x_i2c_adapt_div()
890 	i2c_writel(i2c, val, REG_CON);  in rk3x_i2c_adapt_div()
891 	i2c_writel(i2c, (calc.div_high << 16) | (calc.div_low & 0xffff),  in rk3x_i2c_adapt_div()
893 	spin_unlock_irqrestore(&i2c->lock, flags);  in rk3x_i2c_adapt_div()
895 	clk_disable(i2c->pclk);  in rk3x_i2c_adapt_div()
900 	dev_dbg(i2c->dev,  in rk3x_i2c_adapt_div()
918  * Code adapted from i2c-cadence.c.
928 	struct rk3x_i2c *i2c = container_of(nb, struct rk3x_i2c, clk_rate_nb);  in rk3x_i2c_clk_notifier_cb()  local
938 		if (i2c->soc_data->calc_timings(ndata->new_rate, &i2c->t,  in rk3x_i2c_clk_notifier_cb()
944 			rk3x_i2c_adapt_div(i2c, ndata->new_rate);  in rk3x_i2c_clk_notifier_cb()
950 			rk3x_i2c_adapt_div(i2c, ndata->new_rate);  in rk3x_i2c_clk_notifier_cb()
955 			rk3x_i2c_adapt_div(i2c, ndata->old_rate);  in rk3x_i2c_clk_notifier_cb()
963  * rk3x_i2c_setup - Setup I2C registers for an I2C operation specified by msgs, num.
964  * @i2c: target controller data
965  * @msgs: I2C msgs to process
968  * Must be called with i2c->lock held.
970  * Return: Number of I2C msgs processed or negative in case of error
972 static int rk3x_i2c_setup(struct rk3x_i2c *i2c, struct i2c_msg *msgs, int num)  in rk3x_i2c_setup()  argument
978 	 * The I2C adapter can issue a small (len < 4) write packet before  in rk3x_i2c_setup()
989 		dev_dbg(i2c->dev, "Combined write/read from addr 0x%x\n",  in rk3x_i2c_setup()
999 		i2c->msg = &msgs[1];  in rk3x_i2c_setup()
1001 		i2c->mode = REG_CON_MOD_REGISTER_TX;  in rk3x_i2c_setup()
1003 		i2c_writel(i2c, addr | REG_MRXADDR_VALID(0), REG_MRXADDR);  in rk3x_i2c_setup()
1004 		i2c_writel(i2c, reg_addr, REG_MRXRADDR);  in rk3x_i2c_setup()
1020 			i2c->mode = REG_CON_MOD_REGISTER_TX;  in rk3x_i2c_setup()
1021 			i2c_writel(i2c, addr | REG_MRXADDR_VALID(0),  in rk3x_i2c_setup()
1023 			i2c_writel(i2c, 0, REG_MRXRADDR);  in rk3x_i2c_setup()
1025 			i2c->mode = REG_CON_MOD_TX;  in rk3x_i2c_setup()
1028 		i2c->msg = &msgs[0];  in rk3x_i2c_setup()
1033 	i2c->addr = msgs[0].addr;  in rk3x_i2c_setup()
1034 	i2c->busy = true;  in rk3x_i2c_setup()
1035 	i2c->state = STATE_START;  in rk3x_i2c_setup()
1036 	i2c->processed = 0;  in rk3x_i2c_setup()
1037 	i2c->error = 0;  in rk3x_i2c_setup()
1039 	rk3x_i2c_clean_ipd(i2c);  in rk3x_i2c_setup()
1044 static int rk3x_i2c_wait_xfer_poll(struct rk3x_i2c *i2c)  in rk3x_i2c_wait_xfer_poll()  argument
1048 	while (READ_ONCE(i2c->busy) &&  in rk3x_i2c_wait_xfer_poll()
1051 		rk3x_i2c_irq(0, i2c);  in rk3x_i2c_wait_xfer_poll()
1054 	return !i2c->busy;  in rk3x_i2c_wait_xfer_poll()
1060 	struct rk3x_i2c *i2c = (struct rk3x_i2c *)adap->algo_data;  in rk3x_i2c_xfer_common()  local
1066 	spin_lock_irqsave(&i2c->lock, flags);  in rk3x_i2c_xfer_common()
1068 	clk_enable(i2c->clk);  in rk3x_i2c_xfer_common()
1069 	clk_enable(i2c->pclk);  in rk3x_i2c_xfer_common()
1071 	i2c->is_last_msg = false;  in rk3x_i2c_xfer_common()
1078 		ret = rk3x_i2c_setup(i2c, msgs + i, num - i);  in rk3x_i2c_xfer_common()
1081 			dev_err(i2c->dev, "rk3x_i2c_setup() failed\n");  in rk3x_i2c_xfer_common()
1086 			i2c->is_last_msg = true;  in rk3x_i2c_xfer_common()
1088 		spin_unlock_irqrestore(&i2c->lock, flags);  in rk3x_i2c_xfer_common()
1090 		rk3x_i2c_start(i2c);  in rk3x_i2c_xfer_common()
1093 			timeout = wait_event_timeout(i2c->wait, !i2c->busy,  in rk3x_i2c_xfer_common()
1096 			timeout = rk3x_i2c_wait_xfer_poll(i2c);  in rk3x_i2c_xfer_common()
1099 		spin_lock_irqsave(&i2c->lock, flags);  in rk3x_i2c_xfer_common()
1102 			dev_err(i2c->dev, "timeout, ipd: 0x%02x, state: %d\n",  in rk3x_i2c_xfer_common()
1103 				i2c_readl(i2c, REG_IPD), i2c->state);  in rk3x_i2c_xfer_common()
1106 			i2c_writel(i2c, 0, REG_IEN);  in rk3x_i2c_xfer_common()
1107 			val = i2c_readl(i2c, REG_CON) & REG_CON_TUNING_MASK;  in rk3x_i2c_xfer_common()
1109 			i2c_writel(i2c, val, REG_CON);  in rk3x_i2c_xfer_common()
1111 			i2c->state = STATE_IDLE;  in rk3x_i2c_xfer_common()
1117 		if (i2c->error) {  in rk3x_i2c_xfer_common()
1118 			ret = i2c->error;  in rk3x_i2c_xfer_common()
1123 	clk_disable(i2c->pclk);  in rk3x_i2c_xfer_common()
1124 	clk_disable(i2c->clk);  in rk3x_i2c_xfer_common()
1126 	spin_unlock_irqrestore(&i2c->lock, flags);  in rk3x_i2c_xfer_common()
1145 	struct rk3x_i2c *i2c = dev_get_drvdata(dev);  in rk3x_i2c_resume()  local
1147 	rk3x_i2c_adapt_div(i2c, clk_get_rate(i2c->clk));  in rk3x_i2c_resume()
1200 		.compatible = "rockchip,rv1108-i2c",
1204 		.compatible = "rockchip,rv1126-i2c",
1208 		.compatible = "rockchip,rk3066-i2c",
1212 		.compatible = "rockchip,rk3188-i2c",
1216 		.compatible = "rockchip,rk3228-i2c",
1220 		.compatible = "rockchip,rk3288-i2c",
1224 		.compatible = "rockchip,rk3399-i2c",
1235 	struct rk3x_i2c *i2c;  in rk3x_i2c_probe()  local
1242 	i2c = devm_kzalloc(&pdev->dev, sizeof(struct rk3x_i2c), GFP_KERNEL);  in rk3x_i2c_probe()
1243 	if (!i2c)  in rk3x_i2c_probe()
1247 	i2c->soc_data = match->data;  in rk3x_i2c_probe()
1249 	/* use common interface to get I2C timing properties */  in rk3x_i2c_probe()
1250 	i2c_parse_fw_timings(&pdev->dev, &i2c->t, true);  in rk3x_i2c_probe()
1252 	strscpy(i2c->adap.name, "rk3x-i2c", sizeof(i2c->adap.name));  in rk3x_i2c_probe()
1253 	i2c->adap.owner = THIS_MODULE;  in rk3x_i2c_probe()
1254 	i2c->adap.algo = &rk3x_i2c_algorithm;  in rk3x_i2c_probe()
1255 	i2c->adap.retries = 3;  in rk3x_i2c_probe()
1256 	i2c->adap.dev.of_node = np;  in rk3x_i2c_probe()
1257 	i2c->adap.algo_data = i2c;  in rk3x_i2c_probe()
1258 	i2c->adap.dev.parent = &pdev->dev;  in rk3x_i2c_probe()
1260 	i2c->dev = &pdev->dev;  in rk3x_i2c_probe()
1262 	spin_lock_init(&i2c->lock);  in rk3x_i2c_probe()
1263 	init_waitqueue_head(&i2c->wait);  in rk3x_i2c_probe()
1265 	i2c->regs = devm_platform_ioremap_resource(pdev, 0);  in rk3x_i2c_probe()
1266 	if (IS_ERR(i2c->regs))  in rk3x_i2c_probe()
1267 		return PTR_ERR(i2c->regs);  in rk3x_i2c_probe()
1269 	/* Try to set the I2C adapter number from dt */  in rk3x_i2c_probe()
1270 	bus_nr = of_alias_get_id(np, "i2c");  in rk3x_i2c_probe()
1276 	if (i2c->soc_data->grf_offset >= 0) {  in rk3x_i2c_probe()
1282 				"rk3x-i2c needs 'rockchip,grf' property\n");  in rk3x_i2c_probe()
1287 			dev_err(&pdev->dev, "rk3x-i2c needs i2cX alias");  in rk3x_i2c_probe()
1294 		ret = regmap_write(grf, i2c->soc_data->grf_offset, value);  in rk3x_i2c_probe()
1296 			dev_err(i2c->dev, "Could not write to GRF: %d\n", ret);  in rk3x_i2c_probe()
1307 			       0, dev_name(&pdev->dev), i2c);  in rk3x_i2c_probe()
1313 	platform_set_drvdata(pdev, i2c);  in rk3x_i2c_probe()
1315 	if (i2c->soc_data->calc_timings == rk3x_i2c_v0_calc_timings) {  in rk3x_i2c_probe()
1317 		i2c->clk = devm_clk_get(&pdev->dev, NULL);  in rk3x_i2c_probe()
1318 		i2c->pclk = i2c->clk;  in rk3x_i2c_probe()
1320 		i2c->clk = devm_clk_get(&pdev->dev, "i2c");  in rk3x_i2c_probe()
1321 		i2c->pclk = devm_clk_get(&pdev->dev, "pclk");  in rk3x_i2c_probe()
1324 	if (IS_ERR(i2c->clk))  in rk3x_i2c_probe()
1325 		return dev_err_probe(&pdev->dev, PTR_ERR(i2c->clk),  in rk3x_i2c_probe()
1328 	if (IS_ERR(i2c->pclk))  in rk3x_i2c_probe()
1329 		return dev_err_probe(&pdev->dev, PTR_ERR(i2c->pclk),  in rk3x_i2c_probe()
1332 	ret = clk_prepare(i2c->clk);  in rk3x_i2c_probe()
1337 	ret = clk_prepare(i2c->pclk);  in rk3x_i2c_probe()
1343 	i2c->clk_rate_nb.notifier_call = rk3x_i2c_clk_notifier_cb;  in rk3x_i2c_probe()
1344 	ret = clk_notifier_register(i2c->clk, &i2c->clk_rate_nb);  in rk3x_i2c_probe()
1350 	ret = clk_enable(i2c->clk);  in rk3x_i2c_probe()
1356 	clk_rate = clk_get_rate(i2c->clk);  in rk3x_i2c_probe()
1357 	rk3x_i2c_adapt_div(i2c, clk_rate);  in rk3x_i2c_probe()
1358 	clk_disable(i2c->clk);  in rk3x_i2c_probe()
1360 	ret = i2c_add_adapter(&i2c->adap);  in rk3x_i2c_probe()
1367 	clk_notifier_unregister(i2c->clk, &i2c->clk_rate_nb);  in rk3x_i2c_probe()
1369 	clk_unprepare(i2c->pclk);  in rk3x_i2c_probe()
1371 	clk_unprepare(i2c->clk);  in rk3x_i2c_probe()
1377 	struct rk3x_i2c *i2c = platform_get_drvdata(pdev);  in rk3x_i2c_remove()  local
1379 	i2c_del_adapter(&i2c->adap);  in rk3x_i2c_remove()
1381 	clk_notifier_unregister(i2c->clk, &i2c->clk_rate_nb);  in rk3x_i2c_remove()
1382 	clk_unprepare(i2c->pclk);  in rk3x_i2c_remove()
1383 	clk_unprepare(i2c->clk);  in rk3x_i2c_remove()
1392 		.name  = "rk3x-i2c",
1400 MODULE_DESCRIPTION("Rockchip RK3xxx I2C Bus driver");