[src/trunk]: src/sys/dev/i2c Add clk provider

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8ba32e33a2d2
branches:  trunk
changeset: 466715:8ba32e33a2d2
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Wed Jan 01 00:38:30 2020 +0000

description:
Add clk provider

diffstat:

 sys/dev/i2c/rkpmic.c |  113 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 111 insertions(+), 2 deletions(-)

diffs (169 lines):

diff -r 06a193f17a1a -r 8ba32e33a2d2 sys/dev/i2c/rkpmic.c
--- a/sys/dev/i2c/rkpmic.c      Wed Jan 01 00:24:52 2020 +0000
+++ b/sys/dev/i2c/rkpmic.c      Wed Jan 01 00:38:30 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: rkpmic.c,v 1.5 2019/09/18 15:12:37 tnn Exp $ */
+/* $NetBSD: rkpmic.c,v 1.6 2020/01/01 00:38:30 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2018 Jared McNeill <jmcneill%invisible.ca@localhost>
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rkpmic.c,v 1.5 2019/09/18 15:12:37 tnn Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rkpmic.c,v 1.6 2020/01/01 00:38:30 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -41,6 +41,8 @@
 
 #include <dev/i2c/i2cvar.h>
 
+#include <dev/clk/clk_backend.h>
+
 #include <dev/fdt/fdtvar.h>
 
 #define        SECONDS_REG             0x00
@@ -67,6 +69,9 @@
 #define        CHIP_NAME_REG           0x17
 #define        CHIP_VER_REG            0x18
 
+#define        CLK32OUT_REG            0x20
+#define        CLK32OUT_CLKOUT2_EN     __BIT(0)
+
 struct rkpmic_ctrl {
        const char *    name;
        uint8_t         enable_reg;
@@ -187,6 +192,12 @@
        .nctrl = __arraycount(rk808_ctrls),
 };
 
+struct rkpmic_softc;
+
+struct rkpmic_clk {
+       struct clk      base;
+};
+
 struct rkpmic_softc {
        device_t        sc_dev;
        i2c_tag_t       sc_i2c;
@@ -194,6 +205,8 @@
        int             sc_phandle;
        struct todr_chip_handle sc_todr;
        struct rkpmic_config *sc_conf;
+       struct clk_domain sc_clkdom;
+       struct rkpmic_clk sc_clk[2];
 };
 
 struct rkreg_softc {
@@ -316,6 +329,87 @@
        return 0;
 }
 
+static struct clk *
+rkpmic_clk_decode(device_t dev, int cc_phandle, const void *data, size_t len)
+{
+       struct rkpmic_softc * const sc = device_private(dev);
+
+       if (len != 4)
+               return NULL;
+
+       const u_int id = be32dec(data);
+       if (id >= __arraycount(sc->sc_clk))
+               return NULL;
+
+       return &sc->sc_clk[id].base;
+}
+
+static const struct fdtbus_clock_controller_func rkpmic_clk_fdt_funcs = {
+       .decode = rkpmic_clk_decode
+};
+
+static struct clk *
+rkpmic_clk_get(void *priv, const char *name)
+{
+       struct rkpmic_softc * const sc = priv;
+       u_int n;
+
+       for (n = 0; n < __arraycount(sc->sc_clk); n++) {
+               if (strcmp(name, sc->sc_clk[n].base.name) == 0)
+                       return &sc->sc_clk[n].base;
+       }
+
+       return NULL;
+}
+
+static u_int
+rkpmic_clk_get_rate(void *priv, struct clk *clk)
+{
+       return 32768;
+}
+
+static int
+rkpmic_clk_enable(void *priv, struct clk *clk)
+{
+       struct rkpmic_softc * const sc = priv;
+       uint8_t val;
+
+       if (clk != &sc->sc_clk[1].base)
+               return 0;
+
+       I2C_LOCK(sc);
+       val = I2C_READ(sc, CLK32OUT_REG);
+       val |= CLK32OUT_CLKOUT2_EN;
+       I2C_WRITE(sc, CLK32OUT_REG, val);
+       I2C_UNLOCK(sc);
+
+       return 0;
+}
+
+static int
+rkpmic_clk_disable(void *priv, struct clk *clk)
+{
+       struct rkpmic_softc * const sc = priv;
+       uint8_t val;
+
+       if (clk != &sc->sc_clk[1].base)
+               return EIO;
+
+       I2C_LOCK(sc);
+       val = I2C_READ(sc, CLK32OUT_REG);
+       val &= ~CLK32OUT_CLKOUT2_EN;
+       I2C_WRITE(sc, CLK32OUT_REG, val);
+       I2C_UNLOCK(sc);
+
+       return 0;
+}
+
+static const struct clk_funcs rkpmic_clk_funcs = {
+       .get = rkpmic_clk_get,
+       .get_rate = rkpmic_clk_get_rate,
+       .enable = rkpmic_clk_enable,
+       .disable = rkpmic_clk_disable,
+};
 
 static int
 rkpmic_match(device_t parent, cfdata_t match, void *aux)
@@ -367,6 +461,21 @@
 
        fdtbus_todr_attach(self, sc->sc_phandle, &sc->sc_todr);
 
+       sc->sc_clkdom.name = device_xname(self);
+       sc->sc_clkdom.funcs = &rkpmic_clk_funcs;
+       sc->sc_clkdom.priv = sc;
+
+       sc->sc_clk[0].base.domain = &sc->sc_clkdom;
+       sc->sc_clk[0].base.name = "xin32k";
+       clk_attach(&sc->sc_clk[0].base);
+
+       sc->sc_clk[1].base.domain = &sc->sc_clkdom;
+       sc->sc_clk[1].base.name = "clkout2";
+       clk_attach(&sc->sc_clk[1].base);
+
+       fdtbus_register_clock_controller(self, sc->sc_phandle,
+           &rkpmic_clk_fdt_funcs);
+
        regulators = of_find_firstchild_byname(sc->sc_phandle, "regulators");
        if (regulators < 0)
                return;