[src/trunk]: src/sys/arch/arm/nvidia If the "vqmmc-supply" regulator is prese...

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

details:   https://anonhg.NetBSD.org/src/rev/ae83f835bc99
branches:  trunk
changeset: 823436:ae83f835bc99
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Apr 22 21:50:49 2017 +0000

description:
If the "vqmmc-supply" regulator is present, use it to set signal voltage.

diffstat:

 sys/arch/arm/nvidia/tegra_sdhc.c |  40 ++++++++++++++++++++++++++++++++++++++--
 1 files changed, 38 insertions(+), 2 deletions(-)

diffs (79 lines):

diff -r 7ff71e9be6d9 -r ae83f835bc99 sys/arch/arm/nvidia/tegra_sdhc.c
--- a/sys/arch/arm/nvidia/tegra_sdhc.c  Sat Apr 22 21:50:13 2017 +0000
+++ b/sys/arch/arm/nvidia/tegra_sdhc.c  Sat Apr 22 21:50:49 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: tegra_sdhc.c,v 1.18 2017/04/22 17:41:20 jmcneill Exp $ */
+/* $NetBSD: tegra_sdhc.c,v 1.19 2017/04/22 21:50:49 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2015 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -31,7 +31,7 @@
 #include "locators.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: tegra_sdhc.c,v 1.18 2017/04/22 17:41:20 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: tegra_sdhc.c,v 1.19 2017/04/22 21:50:49 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -54,6 +54,7 @@
 
 static int     tegra_sdhc_card_detect(struct sdhc_softc *);
 static int     tegra_sdhc_write_protect(struct sdhc_softc *);
+static int     tegra_sdhc_signal_voltage(struct sdhc_softc *, int);
 
 struct tegra_sdhc_softc {
        struct sdhc_softc       sc;
@@ -70,6 +71,8 @@
        struct fdtbus_gpio_pin  *sc_pin_cd;
        struct fdtbus_gpio_pin  *sc_pin_power;
        struct fdtbus_gpio_pin  *sc_pin_wp;
+
+       struct fdtbus_regulator *sc_reg_vqmmc;
 };
 
 CFATTACH_DECL_NEW(tegra_sdhc, sizeof(struct tegra_sdhc_softc),
@@ -154,6 +157,12 @@
                sc->sc.sc_vendor_write_protect = tegra_sdhc_write_protect;
        }
 
+       sc->sc_reg_vqmmc = fdtbus_regulator_acquire(faa->faa_phandle,
+           "vqmmc-supply");
+       if (sc->sc_reg_vqmmc) {
+               sc->sc.sc_vendor_signal_voltage = tegra_sdhc_signal_voltage;
+       }
+
        sc->sc_clk = fdtbus_clock_get_index(faa->faa_phandle, 0);
        if (sc->sc_clk == NULL) {
                aprint_error(": couldn't get clock\n");
@@ -235,3 +244,30 @@
 
        return fdtbus_gpio_read(sc->sc_pin_wp);
 }
+
+static int
+tegra_sdhc_signal_voltage(struct sdhc_softc *ssc, int signal_voltage)
+{
+       struct tegra_sdhc_softc *sc = device_private(ssc->sc_dev);
+       u_int uvol;
+       int error;
+
+       KASSERT(sc->sc_reg_vqmmc != NULL);
+
+       switch (signal_voltage) {
+       case SDMMC_SIGNAL_VOLTAGE_330:
+               uvol = 3300000;
+               break;
+       case SDMMC_SIGNAL_VOLTAGE_180:
+               uvol = 1800000;
+               break;
+       default:
+               return EINVAL;
+       }
+
+       error = fdtbus_regulator_set_voltage(sc->sc_reg_vqmmc, uvol, uvol);
+       if (error != 0)
+               return error;
+
+       return fdtbus_regulator_enable(sc->sc_reg_vqmmc);
+}