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Commit 9d967a61 authored by Vincent Yang's avatar Vincent Yang Committed by Ulf Hansson
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mmc: sdhci: add a voltage switch callback function 



This patch adds a callback function to do
controller-specific actions when switching voltages.
It is a preparation and will be used by Fujitsu
SDHCI controller f_sdh30 driver.

Signed-off-by: default avatarVincent Yang <Vincent.Yang@tw.fujitsu.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 29d0d161

drivers/mmc/host/sdhci.c

+4 −0
Original line number Diff line number Diff line
@@ -1829,6 +1829,10 @@ static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host, 
		ctrl |= SDHCI_CTRL_VDD_180;

		sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);



		/* Some controller need to do more when switching */

		if (host->ops->voltage_switch)

			host->ops->voltage_switch(host);



		/* 1.8V regulator output should be stable within 5 ms */

		ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);

		if (ctrl & SDHCI_CTRL_VDD_180)

drivers/mmc/host/sdhci.h

+1 −0
Original line number Diff line number Diff line
@@ -339,6 +339,7 @@ struct sdhci_ops { 
	void    (*adma_workaround)(struct sdhci_host *host, u32 intmask);

	void	(*platform_init)(struct sdhci_host *host);

	void    (*card_event)(struct sdhci_host *host);

	void	(*voltage_switch)(struct sdhci_host *host);

};



#ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS