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      1 /*	$NetBSD: imx_i2c.c,v 1.4 2025/09/16 11:55:16 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2019 Genetec Corporation.  All rights reserved.
      5  * Written by Hashimoto Kenichi for Genetec Corporation.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: imx_i2c.c,v 1.4 2025/09/16 11:55:16 thorpej Exp $");
     31 
     32 #include <sys/bus.h>
     33 
     34 #include <arm/imx/imxi2cvar.h>
     35 
     36 #include <dev/fdt/fdtvar.h>
     37 
     38 static const struct device_compatible_entry compat_data[] = {
     39 	{ .compat = "fsl,imx21-i2c" },
     40 	DEVICE_COMPAT_EOL
     41 };
     42 
     43 int
     44 imxi2c_match(device_t parent, cfdata_t cf, void *aux)
     45 {
     46 	struct fdt_attach_args * const faa = aux;
     47 
     48 	return of_compatible_match(faa->faa_phandle, compat_data);
     49 }
     50 
     51 void
     52 imxi2c_attach(device_t parent __unused, device_t self, void *aux)
     53 {
     54 	struct imxi2c_softc *imxsc = device_private(self);
     55 	struct fdt_attach_args * const faa = aux;
     56 	const int phandle = faa->faa_phandle;
     57 	bus_space_tag_t bst = faa->faa_bst;
     58 	bus_addr_t addr;
     59 	bus_size_t size;
     60 	int error;
     61 
     62 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     63 		aprint_error(": couldn't get registers\n");
     64 		return;
     65 	}
     66 
     67 	imxsc->sc_clk = fdtbus_clock_get_index(phandle, 0);
     68 	if (imxsc->sc_clk == NULL) {
     69 		aprint_error(": couldn't get clock\n");
     70 		return;
     71 	}
     72 
     73 	error = clk_enable(imxsc->sc_clk);
     74 	if (error) {
     75 		aprint_error_dev(self, "couldn't enable: %d\n", error);
     76 		return;
     77 	}
     78 
     79 	u_int freq;
     80 	error = of_getprop_uint32(phandle, "clock-frequency", &freq);
     81 	if (error)
     82 		freq = 100000;
     83 
     84 	imxi2c_attach_common(self, bst, addr, size,
     85 	    clk_get_rate(imxsc->sc_clk), freq);
     86 }
     87