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mmc: usdhi6rol0: add pinctrl to set pin drive strength 

Some boards need different pin drive strength for the UHS mode. Add an
optional pinctrl setting with two pin states covering UHS speeds and
other speeds.

Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Lars Persson 2016-04-27 17:21:29 +02:00 committed by Ulf Hansson
parent 0cd59df9f0
commit 488aab3d0c
1 changed files with 48 additions and 0 deletions
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48
drivers/mmc/host/usdhi6rol0.c
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@ -22,6 +22,7 @@
#include <linux/mmc/sdio.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/string.h>
@ -198,6 +199,11 @@ struct usdhi6_host {
struct dma_chan *chan_rx;
struct dma_chan *chan_tx;
bool dma_active;
/* Pin control */
struct pinctrl *pinctrl;
struct pinctrl_state *pins_default;
struct pinctrl_state *pins_uhs;
};
/* I/O primitives */
@ -1147,12 +1153,35 @@ static void usdhi6_enable_sdio_irq(struct mmc_host *mmc, int enable)
}
}
static int usdhi6_set_pinstates(struct usdhi6_host *host, int voltage)
{
if (IS_ERR(host->pins_uhs))
return 0;
switch (voltage) {
case MMC_SIGNAL_VOLTAGE_180:
case MMC_SIGNAL_VOLTAGE_120:
return pinctrl_select_state(host->pinctrl,
host->pins_uhs);
default:
return pinctrl_select_state(host->pinctrl,
host->pins_default);
}
}
static int usdhi6_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
{
int ret;
ret = mmc_regulator_set_vqmmc(mmc, ios);
if (ret < 0)
return ret;
ret = usdhi6_set_pinstates(mmc_priv(mmc), ios->signal_voltage);
if (ret)
dev_warn_once(mmc_dev(mmc),
"Failed to set pinstate err=%d\n", ret);
return ret;
}
@ -1740,6 +1769,25 @@ static int usdhi6_probe(struct platform_device *pdev)
host->wait = USDHI6_WAIT_FOR_REQUEST;
host->timeout = msecs_to_jiffies(4000);
host->pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR(host->pinctrl)) {
ret = PTR_ERR(host->pinctrl);
goto e_free_mmc;
}
host->pins_uhs = pinctrl_lookup_state(host->pinctrl, "state_uhs");
if (!IS_ERR(host->pins_uhs)) {
host->pins_default = pinctrl_lookup_state(host->pinctrl,
PINCTRL_STATE_DEFAULT);
if (IS_ERR(host->pins_default)) {
dev_err(dev,
"UHS pinctrl requires a default pin state.\n");
ret = PTR_ERR(host->pins_default);
goto e_free_mmc;
}
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
host->base = devm_ioremap_resource(dev, res);
if (IS_ERR(host->base)) {