[PATCH 8/8] omap_hsmmc: allow for a shared VccQ

Adrian Hunter
2010-01-13T11:41:09Z

>From e9f84e6199b09525bef9daf4673ea2b56c4c7151 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@nokia.com>
Date: Thu, 7 Jan 2010 13:54:45 +0200
Subject: [PATCH] omap_hsmmc: allow for a shared VccQ

EMMC can have two voltage supplies, Vcc and VccQ
which are implemented in the code as consumer
supplies vmmc and vmmc_aux.

If the regulator that supplies vmmc_aux is shared
with other consumers, then sending it to sleep
will disrupt those consumers. However, the
TWL4030-family regulators may have OFF remapped
to SLEEP, in which case 'regulator_disable()'
will put the regulator to sleep only when all
consumers are disabled - which is the desired
behaviour.

This patch adds a platform data field to allow
that option.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
---
arch/arm/mach-omap2/hsmmc.c | 3 +++
arch/arm/mach-omap2/hsmmc.h | 1 +
arch/arm/plat-omap/include/plat/mmc.h | 3 +++
drivers/mmc/host/omap_hsmmc.c | 6 +++++-
4 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
index 457ac48..bd8d19b 100644
--- a/arch/arm/mach-omap2/hsmmc.c
+++ b/arch/arm/mach-omap2/hsmmc.c
@@ -95,6 +95,9 @@ void __init omap2_hsmmc_init(struct omap2_hsmmc_info *controllers)
if (c->no_off)
mmc->slots[0].no_off = 1;

+ if (c->vcc_aux_disable_is_sleep)
+ mmc->slots[0].vcc_aux_disable_is_sleep = 1;
+
/* NOTE: MMC slots should have a Vcc regulator set up.
* This may be from a TWL4030-family chip, another
* controllable regulator, or a fixed supply.
diff --git a/arch/arm/mach-omap2/hsmmc.h b/arch/arm/mach-omap2/hsmmc.h
index 1887e4b..88e4459 100644
--- a/arch/arm/mach-omap2/hsmmc.h
+++ b/arch/arm/mach-omap2/hsmmc.h
@@ -15,6 +15,7 @@ struct omap2_hsmmc_info {
bool nonremovable; /* Nonremovable e.g. eMMC */
bool power_saving; /* Try to sleep or power off when possible */
bool no_off; /* power_saving and power is not to go off */
+ bool vcc_aux_disable_is_sleep; /* Regulator off remapped to sleep */
int gpio_cd; /* or -EINVAL */
int gpio_wp; /* or -EINVAL */
char *name; /* or NULL for default */
diff --git a/arch/arm/plat-omap/include/plat/mmc.h b/arch/arm/plat-omap/include/plat/mmc.h
index b6cd39c..865644b 100644
--- a/arch/arm/plat-omap/include/plat/mmc.h
+++ b/arch/arm/plat-omap/include/plat/mmc.h
@@ -102,6 +102,9 @@ struct omap_mmc_platform_data {
/* If using power_saving and the MMC power is not to go off */
unsigned no_off:1;

+ /* Regulator off remapped to sleep */
+ unsigned vcc_aux_disable_is_sleep:1;
+
int switch_pin; /* gpio (card detect) */
int gpio_wp; /* gpio (write protect) */

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 677be61..2b09659 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -425,7 +425,11 @@ static int omap_hsmmc_23_set_sleep(struct device *dev, int slot, int sleep,
err = regulator_set_mode(host->vcc, mode);
if (err)
return err;
- return regulator_set_mode(host->vcc_aux, mode);
+
+ if (mmc_slot(host).vcc_aux_disable_is_sleep)
+ return regulator_disable(host->vcc_aux);
+ else
+ return regulator_set_mode(host->vcc_aux, mode);
}

static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata)
--
1.6.0.4