1 /* $NetBSD: imx_i2c.c,v 1.2 2021/01/27 03:10:20 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 1.2 2021/01/27 03:10:20 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 *sc = 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 sc->sc_clk = fdtbus_clock_get_index(phandle, 0); 68 if (sc->sc_clk == NULL) { 69 aprint_error(": couldn't get clock\n"); 70 return; 71 } 72 73 error = clk_enable(sc->sc_clk); 74 if (error) { 75 aprint_error_dev(sc->sc_dev, "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 imxi2c_set_freq(self, clk_get_rate(sc->sc_clk), freq); 84 85 sc->sc_motoi2c.sc_phandle = phandle; 86 87 imxi2c_attach_common(parent, self, bst, addr, size, -1, 0); 88 } 89 90