1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Copyright (C) 2009 - 2014 Xilinx, Inc.
24 #define CDNS_I2C_XFER_SIZE_OFFSET	0x14 /* Transfer Size Register, RW */
35 /* Read or Write Master transfer 0 = Transmitter, 1 = Receiver */
58  * Normal addressing mode uses [6:0] bits. Extended addressing mode uses [9:0]
59  * bits. A write access to this register always initiates a transfer if the I2C
117 #define CDNS_I2C_DATA_INTR_DEPTH	(CDNS_I2C_FIFO_DEPTH - 2)
119 /* Transfer size in multiples of data interrupt depth */
120 #define CDNS_I2C_TRANSFER_SIZE	(CDNS_I2C_MAX_TRANSFER_SIZE - 3)
122 #define DRIVER_NAME		"cdns-i2c"
131 #define cdns_i2c_readreg(offset)       readl_relaxed(id->membase + offset)
132 #define cdns_i2c_writereg(val, offset) writel_relaxed(val, id->membase + offset)
136  * enum cdns_i2c_mode - I2C Controller current operating mode
147  * enum cdns_i2c_slave_state - Slave state when I2C is operating in slave mode
161  * struct cdns_i2c - I2C device private data structure
168  * @xfer_done:		Transfer complete status
173  * @curr_recv_count:	Number of bytes to be received in current transfer
223  * cdns_i2c_clear_bus_hold - Clear bus hold bit
238 		(id->curr_recv_count == CDNS_I2C_FIFO_DEPTH + 1));  in cdns_is_holdquirk()
247 	/* Clear FIFO and transfer size */  in cdns_i2c_set_mode()
251 	id->dev_mode = mode;  in cdns_i2c_set_mode()
252 	id->slave_state = CDNS_I2C_SLAVE_STATE_IDLE;  in cdns_i2c_set_mode()
257 		cdns_i2c_writereg(id->ctrl_reg_diva_divb |  in cdns_i2c_set_mode()
270 		cdns_i2c_writereg(id->ctrl_reg_diva_divb &  in cdns_i2c_set_mode()
275 		cdns_i2c_writereg(id->slave->addr & CDNS_I2C_ADDR_MASK,  in cdns_i2c_set_mode()
291 	if (id->slave_state == CDNS_I2C_SLAVE_STATE_IDLE) {  in cdns_i2c_slave_rcv_data()
292 		id->slave_state = CDNS_I2C_SLAVE_STATE_RECV;  in cdns_i2c_slave_rcv_data()
293 		i2c_slave_event(id->slave, I2C_SLAVE_WRITE_REQUESTED, NULL);  in cdns_i2c_slave_rcv_data()
300 	while (bytes--) {  in cdns_i2c_slave_rcv_data()
302 		i2c_slave_event(id->slave, I2C_SLAVE_WRITE_RECEIVED, &data);  in cdns_i2c_slave_rcv_data()
311 	if (id->slave_state == CDNS_I2C_SLAVE_STATE_IDLE) {  in cdns_i2c_slave_send_data()
312 		id->slave_state = CDNS_I2C_SLAVE_STATE_SEND;  in cdns_i2c_slave_send_data()
313 		i2c_slave_event(id->slave, I2C_SLAVE_READ_REQUESTED, &data);  in cdns_i2c_slave_send_data()
315 		i2c_slave_event(id->slave, I2C_SLAVE_READ_PROCESSED, &data);  in cdns_i2c_slave_send_data()
323  * cdns_i2c_slave_isr - Interrupt handler for the I2C device in slave role
326  * This function handles the data interrupt and transfer complete interrupt of
343 	/* Fetch transfer mode (send/receive) */  in cdns_i2c_slave_isr()
353 			id->slave_state = CDNS_I2C_SLAVE_STATE_IDLE;  in cdns_i2c_slave_isr()
354 			i2c_slave_event(id->slave, I2C_SLAVE_STOP, NULL);  in cdns_i2c_slave_isr()
363 			id->slave_state = CDNS_I2C_SLAVE_STATE_IDLE;  in cdns_i2c_slave_isr()
364 			i2c_slave_event(id->slave, I2C_SLAVE_STOP, NULL);  in cdns_i2c_slave_isr()
371 		id->slave_state = CDNS_I2C_SLAVE_STATE_IDLE;  in cdns_i2c_slave_isr()
372 		i2c_slave_event(id->slave, I2C_SLAVE_STOP, NULL);  in cdns_i2c_slave_isr()
381  * cdns_i2c_master_isr - Interrupt handler for the I2C device in master role
384  * This function handles the data interrupt, transfer complete interrupt and
401 	id->err_status = 0;  in cdns_i2c_master_isr()
410 	 * Check if transfer size register needs to be updated again for a  in cdns_i2c_master_isr()
414 	if (id->recv_count > id->curr_recv_count)  in cdns_i2c_master_isr()
417 	hold_quirk = (id->quirks & CDNS_I2C_BROKEN_HOLD_BIT) && updatetx;  in cdns_i2c_master_isr()
420 	if (id->p_recv_buf &&  in cdns_i2c_master_isr()
426 			if (id->recv_count > 0) {  in cdns_i2c_master_isr()
427 				*(id->p_recv_buf)++ =  in cdns_i2c_master_isr()
429 				id->recv_count--;  in cdns_i2c_master_isr()
430 				id->curr_recv_count--;  in cdns_i2c_master_isr()
437 				if (id->recv_count <= CDNS_I2C_FIFO_DEPTH &&  in cdns_i2c_master_isr()
438 				    !id->bus_hold_flag)  in cdns_i2c_master_isr()
442 				dev_err(id->adap.dev.parent,  in cdns_i2c_master_isr()
444 				id->err_status |= CDNS_I2C_IXR_TO;  in cdns_i2c_master_isr()
453 		 * The controller sends NACK to the slave when transfer size  in cdns_i2c_master_isr()
456 		 * maintain transfer size non-zero while performing a large  in cdns_i2c_master_isr()
462 			       (id->curr_recv_count - CDNS_I2C_FIFO_DEPTH))  in cdns_i2c_master_isr()
467 			 * transfer size and update register accordingly.  in cdns_i2c_master_isr()
469 			if (((int)(id->recv_count) - CDNS_I2C_FIFO_DEPTH) >  in cdns_i2c_master_isr()
473 				id->curr_recv_count = CDNS_I2C_TRANSFER_SIZE +  in cdns_i2c_master_isr()
476 				cdns_i2c_writereg(id->recv_count -  in cdns_i2c_master_isr()
479 				id->curr_recv_count = id->recv_count;  in cdns_i2c_master_isr()
481 		} else if (id->recv_count && !hold_quirk &&  in cdns_i2c_master_isr()
482 						!id->curr_recv_count) {  in cdns_i2c_master_isr()
485 			cdns_i2c_writereg(id->p_msg->addr & CDNS_I2C_ADDR_MASK,  in cdns_i2c_master_isr()
488 			if (id->recv_count > CDNS_I2C_TRANSFER_SIZE) {  in cdns_i2c_master_isr()
491 				id->curr_recv_count = CDNS_I2C_TRANSFER_SIZE;  in cdns_i2c_master_isr()
493 				cdns_i2c_writereg(id->recv_count,  in cdns_i2c_master_isr()
495 				id->curr_recv_count = id->recv_count;  in cdns_i2c_master_isr()
500 		if ((isr_status & CDNS_I2C_IXR_COMP) && !id->recv_count) {  in cdns_i2c_master_isr()
501 			if (!id->bus_hold_flag)  in cdns_i2c_master_isr()
509 	/* When sending, handle transfer complete interrupt */  in cdns_i2c_master_isr()
510 	if ((isr_status & CDNS_I2C_IXR_COMP) && !id->p_recv_buf) {  in cdns_i2c_master_isr()
515 		if (id->send_count) {  in cdns_i2c_master_isr()
516 			avail_bytes = CDNS_I2C_FIFO_DEPTH -  in cdns_i2c_master_isr()
518 			if (id->send_count > avail_bytes)  in cdns_i2c_master_isr()
521 				bytes_to_send = id->send_count;  in cdns_i2c_master_isr()
523 			while (bytes_to_send--) {  in cdns_i2c_master_isr()
525 					(*(id->p_send_buf)++),  in cdns_i2c_master_isr()
527 				id->send_count--;  in cdns_i2c_master_isr()
537 		if (!id->send_count && !id->bus_hold_flag)  in cdns_i2c_master_isr()
544 	id->err_status |= isr_status & CDNS_I2C_IXR_ERR_INTR_MASK;  in cdns_i2c_master_isr()
545 	if (id->err_status)  in cdns_i2c_master_isr()
549 		complete(&id->xfer_done);  in cdns_i2c_master_isr()
555  * cdns_i2c_isr - Interrupt handler for the I2C device
569 	if (id->dev_mode == CDNS_I2C_MODE_SLAVE)  in cdns_i2c_isr()
576  * cdns_i2c_mrecv - Prepare and start a master receive operation
589 	id->p_recv_buf = id->p_msg->buf;  in cdns_i2c_mrecv()
590 	id->recv_count = id->p_msg->len;  in cdns_i2c_mrecv()
596 	if (id->p_msg->flags & I2C_M_RECV_LEN)  in cdns_i2c_mrecv()
597 		id->recv_count = I2C_SMBUS_BLOCK_MAX + 1;  in cdns_i2c_mrecv()
599 	id->curr_recv_count = id->recv_count;  in cdns_i2c_mrecv()
605 	if (id->recv_count > CDNS_I2C_FIFO_DEPTH)  in cdns_i2c_mrecv()
616 	 * max transfer size. Set transfer size register with no of bytes  in cdns_i2c_mrecv()
617 	 * receive if it is less than transfer size and transfer size if  in cdns_i2c_mrecv()
620 	if (id->recv_count > CDNS_I2C_TRANSFER_SIZE) {  in cdns_i2c_mrecv()
623 		id->curr_recv_count = CDNS_I2C_TRANSFER_SIZE;  in cdns_i2c_mrecv()
625 		cdns_i2c_writereg(id->recv_count, CDNS_I2C_XFER_SIZE_OFFSET);  in cdns_i2c_mrecv()
629 	if (!id->bus_hold_flag &&  in cdns_i2c_mrecv()
630 	    ((id->p_msg->flags & I2C_M_RECV_LEN) != I2C_M_RECV_LEN) &&  in cdns_i2c_mrecv()
631 	    (id->recv_count <= CDNS_I2C_FIFO_DEPTH)) {  in cdns_i2c_mrecv()
634 			if (id->quirks & CDNS_I2C_BROKEN_HOLD_BIT)  in cdns_i2c_mrecv()
639 	addr = id->p_msg->addr;  in cdns_i2c_mrecv()
645 		 * In case of Xilinx Zynq SOC, clear the HOLD bit before transfer size  in cdns_i2c_mrecv()
646 		 * register reaches '0'. This is an IP bug which causes transfer size  in cdns_i2c_mrecv()
669  * cdns_i2c_msend - Prepare and start a master send operation
679 	id->p_recv_buf = NULL;  in cdns_i2c_msend()
680 	id->p_send_buf = id->p_msg->buf;  in cdns_i2c_msend()
681 	id->send_count = id->p_msg->len;  in cdns_i2c_msend()
692 	if (id->send_count > CDNS_I2C_FIFO_DEPTH)  in cdns_i2c_msend()
705 	avail_bytes = CDNS_I2C_FIFO_DEPTH -  in cdns_i2c_msend()
708 	if (id->send_count > avail_bytes)  in cdns_i2c_msend()
711 		bytes_to_send = id->send_count;  in cdns_i2c_msend()
713 	while (bytes_to_send--) {  in cdns_i2c_msend()
714 		cdns_i2c_writereg((*(id->p_send_buf)++), CDNS_I2C_DATA_OFFSET);  in cdns_i2c_msend()
715 		id->send_count--;  in cdns_i2c_msend()
722 	if (!id->bus_hold_flag && !id->send_count)  in cdns_i2c_msend()
724 	/* Set the slave address in address register - triggers operation. */  in cdns_i2c_msend()
725 	cdns_i2c_writereg(id->p_msg->addr & CDNS_I2C_ADDR_MASK,  in cdns_i2c_msend()
732  * cdns_i2c_master_reset - Reset the interface
740 	struct cdns_i2c *id = adap->algo_data;  in cdns_i2c_master_reset()
766 	id->p_msg = msg;  in cdns_i2c_process_msg()
767 	id->err_status = 0;  in cdns_i2c_process_msg()
768 	reinit_completion(&id->xfer_done);  in cdns_i2c_process_msg()
772 	if (msg->flags & I2C_M_TEN) {  in cdns_i2c_process_msg()
783 	if (msg->flags & I2C_M_RD)  in cdns_i2c_process_msg()
789 	time_left = wait_for_completion_timeout(&id->xfer_done, adap->timeout);  in cdns_i2c_process_msg()
792 		dev_err(id->adap.dev.parent,  in cdns_i2c_process_msg()
794 		return -ETIMEDOUT;  in cdns_i2c_process_msg()
801 	if (id->err_status & CDNS_I2C_IXR_ARB_LOST)  in cdns_i2c_process_msg()
802 		return -EAGAIN;  in cdns_i2c_process_msg()
808  * cdns_i2c_master_xfer - The main i2c transfer function
811  * @num:	the number of messages to transfer
813  * Initiates the send/recv activity based on the transfer message received.
818 				int num)  in cdns_i2c_master_xfer()  argument
822 	struct cdns_i2c *id = adap->algo_data;  in cdns_i2c_master_xfer()
828 	ret = pm_runtime_resume_and_get(id->dev);  in cdns_i2c_master_xfer()
834 	if (id->dev_mode == CDNS_I2C_MODE_SLAVE) {  in cdns_i2c_master_xfer()
835 		if (id->slave_state != CDNS_I2C_SLAVE_STATE_IDLE)  in cdns_i2c_master_xfer()
836 			return -EAGAIN;  in cdns_i2c_master_xfer()
848 		ret = -EAGAIN;  in cdns_i2c_master_xfer()
852 	hold_quirk = !!(id->quirks & CDNS_I2C_BROKEN_HOLD_BIT);  in cdns_i2c_master_xfer()
857 	if (num > 1) {  in cdns_i2c_master_xfer()
865 		for (count = 0; (count < num - 1 && hold_quirk); count++) {  in cdns_i2c_master_xfer()
867 				dev_warn(adap->dev.parent,  in cdns_i2c_master_xfer()
869 				ret = -EOPNOTSUPP;  in cdns_i2c_master_xfer()
873 		id->bus_hold_flag = 1;  in cdns_i2c_master_xfer()
878 		id->bus_hold_flag = 0;  in cdns_i2c_master_xfer()
882 	for (count = 0; count < num; count++, msgs++) {  in cdns_i2c_master_xfer()
883 		if (count == (num - 1))  in cdns_i2c_master_xfer()
884 			id->bus_hold_flag = 0;  in cdns_i2c_master_xfer()
891 		if (id->err_status) {  in cdns_i2c_master_xfer()
894 			if (id->err_status & CDNS_I2C_IXR_NACK) {  in cdns_i2c_master_xfer()
895 				ret = -ENXIO;  in cdns_i2c_master_xfer()
898 			ret = -EIO;  in cdns_i2c_master_xfer()
903 	ret = num;  in cdns_i2c_master_xfer()
913 	pm_runtime_mark_last_busy(id->dev);  in cdns_i2c_master_xfer()
914 	pm_runtime_put_autosuspend(id->dev);  in cdns_i2c_master_xfer()
919  * cdns_i2c_func - Returns the supported features of the I2C driver
941 	struct cdns_i2c *id = container_of(slave->adapter, struct cdns_i2c,  in cdns_reg_slave()
944 	if (id->slave)  in cdns_reg_slave()
945 		return -EBUSY;  in cdns_reg_slave()
947 	if (slave->flags & I2C_CLIENT_TEN)  in cdns_reg_slave()
948 		return -EAFNOSUPPORT;  in cdns_reg_slave()
950 	ret = pm_runtime_resume_and_get(id->dev);  in cdns_reg_slave()
955 	id->slave = slave;  in cdns_reg_slave()
965 	struct cdns_i2c *id = container_of(slave->adapter, struct cdns_i2c,  in cdns_unreg_slave()
968 	pm_runtime_put(id->dev);  in cdns_unreg_slave()
971 	id->slave = NULL;  in cdns_unreg_slave()
990  * cdns_i2c_calc_divs - Calculate clock dividers
1016 		return -EINVAL;  in cdns_i2c_calc_divs()
1018 	last_error = -1;  in cdns_i2c_calc_divs()
1024 		div_b--;  in cdns_i2c_calc_divs()
1031 		current_error = ((actual_fscl > fscl) ? (actual_fscl - fscl) :  in cdns_i2c_calc_divs()
1032 							(fscl - actual_fscl));  in cdns_i2c_calc_divs()
1050  * cdns_i2c_setclk - This function sets the serial clock rate for the I2C device
1070 	unsigned long fscl = id->i2c_clk;  in cdns_i2c_setclk()
1076 	ctrl_reg = id->ctrl_reg;  in cdns_i2c_setclk()
1080 	id->ctrl_reg = ctrl_reg;  in cdns_i2c_setclk()
1083 	id->ctrl_reg_diva_divb = ctrl_reg & (CDNS_I2C_CR_DIVA_MASK |  in cdns_i2c_setclk()
1090  * cdns_i2c_clk_notifier_cb - Clock rate change callback
1098  * New dividers are written to the HW in the pre- or post change notification
1111 	if (pm_runtime_suspended(id->dev))  in cdns_i2c_clk_notifier_cb()
1117 		unsigned long input_clk = ndata->new_rate;  in cdns_i2c_clk_notifier_cb()
1118 		unsigned long fscl = id->i2c_clk;  in cdns_i2c_clk_notifier_cb()
1124 			dev_warn(id->adap.dev.parent,  in cdns_i2c_clk_notifier_cb()
1130 		if (ndata->new_rate > ndata->old_rate)  in cdns_i2c_clk_notifier_cb()
1131 			cdns_i2c_setclk(ndata->new_rate, id);  in cdns_i2c_clk_notifier_cb()
1136 		id->input_clk = ndata->new_rate;  in cdns_i2c_clk_notifier_cb()
1138 		if (ndata->new_rate < ndata->old_rate)  in cdns_i2c_clk_notifier_cb()
1139 			cdns_i2c_setclk(ndata->new_rate, id);  in cdns_i2c_clk_notifier_cb()
1143 		if (ndata->new_rate > ndata->old_rate)  in cdns_i2c_clk_notifier_cb()
1144 			cdns_i2c_setclk(ndata->old_rate, id);  in cdns_i2c_clk_notifier_cb()
1152  * cdns_i2c_runtime_suspend -  Runtime suspend method for the driver
1163 	clk_disable(xi2c->clk);  in cdns_i2c_runtime_suspend()
1169  * cdns_i2c_init -  Controller initialisation
1177 	cdns_i2c_writereg(id->ctrl_reg, CDNS_I2C_CR_OFFSET);  in cdns_i2c_init()
1189  * cdns_i2c_runtime_resume - Runtime resume
1201 	ret = clk_enable(xi2c->clk);  in cdns_i2c_runtime_resume()
1221 	{ .compatible = "cdns,i2c-r1p10", .data = &r1p10_i2c_def },
1222 	{ .compatible = "cdns,i2c-r1p14",},
1228  * cdns_i2c_probe - Platform registration call
1244 	id = devm_kzalloc(&pdev->dev, sizeof(*id), GFP_KERNEL);  in cdns_i2c_probe()
1246 		return -ENOMEM;  in cdns_i2c_probe()
1248 	id->dev = &pdev->dev;  in cdns_i2c_probe()
1251 	match = of_match_node(cdns_i2c_of_match, pdev->dev.of_node);  in cdns_i2c_probe()
1252 	if (match && match->data) {  in cdns_i2c_probe()
1253 		const struct cdns_platform_data *data = match->data;  in cdns_i2c_probe()
1254 		id->quirks = data->quirks;  in cdns_i2c_probe()
1257 	id->membase = devm_platform_get_and_ioremap_resource(pdev, 0, &r_mem);  in cdns_i2c_probe()
1258 	if (IS_ERR(id->membase))  in cdns_i2c_probe()
1259 		return PTR_ERR(id->membase);  in cdns_i2c_probe()
1264 	id->irq = ret;  in cdns_i2c_probe()
1266 	id->adap.owner = THIS_MODULE;  in cdns_i2c_probe()
1267 	id->adap.dev.of_node = pdev->dev.of_node;  in cdns_i2c_probe()
1268 	id->adap.algo = &cdns_i2c_algo;  in cdns_i2c_probe()
1269 	id->adap.timeout = CDNS_I2C_TIMEOUT;  in cdns_i2c_probe()
1270 	id->adap.retries = 3;		/* Default retry value. */  in cdns_i2c_probe()
1271 	id->adap.algo_data = id;  in cdns_i2c_probe()
1272 	id->adap.dev.parent = &pdev->dev;  in cdns_i2c_probe()
1273 	init_completion(&id->xfer_done);  in cdns_i2c_probe()
1274 	snprintf(id->adap.name, sizeof(id->adap.name),  in cdns_i2c_probe()
1275 		 "Cadence I2C at %08lx", (unsigned long)r_mem->start);  in cdns_i2c_probe()
1277 	id->clk = devm_clk_get(&pdev->dev, NULL);  in cdns_i2c_probe()
1278 	if (IS_ERR(id->clk))  in cdns_i2c_probe()
1279 		return dev_err_probe(&pdev->dev, PTR_ERR(id->clk),  in cdns_i2c_probe()
1282 	ret = clk_prepare_enable(id->clk);  in cdns_i2c_probe()
1284 		dev_err(&pdev->dev, "Unable to enable clock.\n");  in cdns_i2c_probe()
1286 	pm_runtime_set_autosuspend_delay(id->dev, CNDS_I2C_PM_TIMEOUT);  in cdns_i2c_probe()
1287 	pm_runtime_use_autosuspend(id->dev);  in cdns_i2c_probe()
1288 	pm_runtime_set_active(id->dev);  in cdns_i2c_probe()
1289 	pm_runtime_enable(id->dev);  in cdns_i2c_probe()
1291 	id->clk_rate_change_nb.notifier_call = cdns_i2c_clk_notifier_cb;  in cdns_i2c_probe()
1292 	if (clk_notifier_register(id->clk, &id->clk_rate_change_nb))  in cdns_i2c_probe()
1293 		dev_warn(&pdev->dev, "Unable to register clock notifier.\n");  in cdns_i2c_probe()
1294 	id->input_clk = clk_get_rate(id->clk);  in cdns_i2c_probe()
1296 	ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",  in cdns_i2c_probe()
1297 			&id->i2c_clk);  in cdns_i2c_probe()
1298 	if (ret || (id->i2c_clk > I2C_MAX_FAST_MODE_FREQ))  in cdns_i2c_probe()
1299 		id->i2c_clk = I2C_MAX_STANDARD_MODE_FREQ;  in cdns_i2c_probe()
1303 	id->dev_mode = CDNS_I2C_MODE_MASTER;  in cdns_i2c_probe()
1304 	id->slave_state = CDNS_I2C_SLAVE_STATE_IDLE;  in cdns_i2c_probe()
1306 	id->ctrl_reg = CDNS_I2C_CR_ACK_EN | CDNS_I2C_CR_NEA | CDNS_I2C_CR_MS;  in cdns_i2c_probe()
1308 	ret = cdns_i2c_setclk(id->input_clk, id);  in cdns_i2c_probe()
1310 		dev_err(&pdev->dev, "invalid SCL clock: %u Hz\n", id->i2c_clk);  in cdns_i2c_probe()
1311 		ret = -EINVAL;  in cdns_i2c_probe()
1315 	ret = devm_request_irq(&pdev->dev, id->irq, cdns_i2c_isr, 0,  in cdns_i2c_probe()
1318 		dev_err(&pdev->dev, "cannot get irq %d\n", id->irq);  in cdns_i2c_probe()
1323 	ret = i2c_add_adapter(&id->adap);  in cdns_i2c_probe()
1327 	dev_info(&pdev->dev, "%u kHz mmio %08lx irq %d\n",  in cdns_i2c_probe()
1328 		 id->i2c_clk / 1000, (unsigned long)r_mem->start, id->irq);  in cdns_i2c_probe()
1333 	clk_disable_unprepare(id->clk);  in cdns_i2c_probe()
1334 	pm_runtime_disable(&pdev->dev);  in cdns_i2c_probe()
1335 	pm_runtime_set_suspended(&pdev->dev);  in cdns_i2c_probe()
1340  * cdns_i2c_remove - Unregister the device after releasing the resources
1351 	pm_runtime_disable(&pdev->dev);  in cdns_i2c_remove()
1352 	pm_runtime_set_suspended(&pdev->dev);  in cdns_i2c_remove()
1353 	pm_runtime_dont_use_autosuspend(&pdev->dev);  in cdns_i2c_remove()
1355 	i2c_del_adapter(&id->adap);  in cdns_i2c_remove()
1356 	clk_notifier_unregister(id->clk, &id->clk_rate_change_nb);  in cdns_i2c_remove()
1357 	clk_disable_unprepare(id->clk);  in cdns_i2c_remove()