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mmc: usdhi6rol0: add pinctrl to set pin drive strength

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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)) {