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@xxxxxxxx>
---
drivers/mmc/host/usdhi6rol0.c | 48 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/drivers/mmc/host/usdhi6rol0.c b/drivers/mmc/host/usdhi6rol0.c
index 743e200..1bd5f1a 100644
--- a/drivers/mmc/host/usdhi6rol0.c
+++ b/drivers/mmc/host/usdhi6rol0.c
@@ -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)) {
--
2.1.4
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