From 3aa8793f751d4cfcaca886e75ab30dfb00cf1d88 Mon Sep 17 00:00:00 2001 From: Ulf Hansson Date: Fri, 28 Nov 2014 14:38:36 +0100 Subject: mmc: core: Initial support for MMC power sequences System on chip designs may specify a specific MMC power sequence. To successfully detect an (e)MMC/SD/SDIO card, that power sequence must be followed while initializing the card. To be able to handle these SOC specific power sequences, let's add a MMC power sequence interface. It provides the following functions to help the mmc core to deal with these power sequences. mmc_pwrseq_alloc() - Invoked from mmc_of_parse(), to initialize data. mmc_pwrseq_pre_power_on()- Invoked in the beginning of mmc_power_up(). mmc_pwrseq_post_power_on()- Invoked at the end in mmc_power_up(). mmc_pwrseq_power_off()- Invoked from mmc_power_off(). mmc_pwrseq_free() - Invoked from mmc_free_host(), to free data. Each MMC power sequence provider will be responsible to implement a set of callbacks. These callbacks mirrors the functions above. This patch adds the skeleton, following patches will extend the core of the MMC power sequence and add support for a specific simple MMC power sequence. Do note, since the mmc_pwrseq_alloc() is invoked from mmc_of_parse(), host drivers needs to make use of this API to enable the support for MMC power sequences. Moreover the MMC power sequence support depends on CONFIG_OF. Signed-off-by: Ulf Hansson Tested-by: Javier Martinez Canillas Reviewed-by: Javier Martinez Canillas --- drivers/mmc/core/host.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/mmc/core/host.c') diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index 0763644..8be0df7 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -30,6 +30,7 @@ #include "core.h" #include "host.h" #include "slot-gpio.h" +#include "pwrseq.h" #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev) @@ -448,7 +449,7 @@ int mmc_of_parse(struct mmc_host *host) host->dsr_req = 0; } - return 0; + return mmc_pwrseq_alloc(host); } EXPORT_SYMBOL(mmc_of_parse); @@ -588,6 +589,7 @@ EXPORT_SYMBOL(mmc_remove_host); */ void mmc_free_host(struct mmc_host *host) { + mmc_pwrseq_free(host); put_device(&host->class_dev); } -- cgit v1.1