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author | Gregory Bean <gbean@codeaurora.org> | 2010-08-28 17:05:44 (GMT) |
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committer | Daniel Walker <dwalker@codeaurora.org> | 2010-10-06 16:01:15 (GMT) |
commit | 1963a2afc81afe6d85e7a12538b74a9919d958ae (patch) | |
tree | f1486399cfce632819509cb86639d3106d539805 /arch/arm/mach-msm/gpiomux-8x60.c | |
parent | 846afbd1fe015e082c89d56dd42c484d896ef58e (diff) | |
download | linux-1963a2afc81afe6d85e7a12538b74a9919d958ae.tar.xz |
msm: add gpiomux api for gpio multiplex & configuration.
Add the 'gpiomux' api, which addresses the following shortcomings
of existing tlmm api:
- gpio power-collapse, which is managed by a peripheral processor on
other targets, must be managed by the application processor on the 8x60.
- The enable/disable flag of the legacy gpio_tlmm_config api
is not applicable on the 8x60, and causes confusion.
- The gpio 'direction' bits are meaningless for all func_sel
configurations except for generic-gpio mode (func_sel 0), in which
case the gpio_direction_* functions should be used. Having these
bits in the tlmm api leads to confusion and misuse of the gpiolib
api, and they have been removed in gpiomux.
- The functional api of the legacy system ran contrary to the typical
use-case, which is a single massive configuration at boot. Rather
than forcing hundreds of 'config' function calls, the new api
allows data to be configured with a single table.
gpiomux_get and gpiomux_put are meant to be called automatically
when gpio_request and gpio_free are called, giving automatic
gpiomux/tlmm control to those drivers/lines with simple
power profiles - in the simplest cases, an entry in the gpiomux table
and the correct usage of gpiolib is all that is required to get proper
gpio power control.
Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
Diffstat (limited to 'arch/arm/mach-msm/gpiomux-8x60.c')
-rw-r--r-- | arch/arm/mach-msm/gpiomux-8x60.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/gpiomux-8x60.c b/arch/arm/mach-msm/gpiomux-8x60.c new file mode 100644 index 0000000..7b380b3 --- /dev/null +++ b/arch/arm/mach-msm/gpiomux-8x60.c @@ -0,0 +1,19 @@ +/* Copyright (c) 2010, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ +#include "gpiomux.h" + +struct msm_gpiomux_config msm_gpiomux_configs[GPIOMUX_NGPIOS] = {}; |