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authorLinus Walleij <linus.walleij@linaro.org>2017-08-08 22:07:14 +0300
committerTejun Heo <tj@kernel.org>2017-08-11 20:32:09 +0300
commitd872ced29d5f847b23bb5a7bc24a234a936568bd (patch)
tree39eb654970d2e974fa946ceb970f0454cb8a94e6 /drivers/ata
parentd99058a232e78c580e92ecf2670eabdbd68a5f2c (diff)
downloadlinux-d872ced29d5f847b23bb5a7bc24a234a936568bd.tar.xz
ata: sata_gemini: Introduce explicit IDE pin control
The IDE pins are managed by the pin controller, if we want to use these, we need to ask the pin controller to explicitly enable them as by default, these pins are used for other business and most users just rely on the SATA bridge. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/sata_gemini.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/ata/sata_gemini.c b/drivers/ata/sata_gemini.c
index 071e49971f6d..46950e0267e0 100644
--- a/drivers/ata/sata_gemini.c
+++ b/drivers/ata/sata_gemini.c
@@ -15,6 +15,7 @@
#include <linux/of_device.h>
#include <linux/clk.h>
#include <linux/io.h>
+#include <linux/pinctrl/consumer.h>
#include "sata_gemini.h"
#define DRV_NAME "gemini_sata_bridge"
@@ -287,6 +288,29 @@ static int gemini_sata_bridge_init(struct sata_gemini *sg)
return 0;
}
+static int gemini_setup_ide_pins(struct device *dev)
+{
+ struct pinctrl *p;
+ struct pinctrl_state *ide_state;
+ int ret;
+
+ p = devm_pinctrl_get(dev);
+ if (IS_ERR(p))
+ return PTR_ERR(p);
+
+ ide_state = pinctrl_lookup_state(p, "ide");
+ if (IS_ERR(ide_state))
+ return PTR_ERR(ide_state);
+
+ ret = pinctrl_select_state(p, ide_state);
+ if (ret) {
+ dev_err(dev, "could not select IDE state\n");
+ return ret;
+ }
+
+ return 0;
+}
+
static int gemini_sata_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -355,6 +379,17 @@ static int gemini_sata_probe(struct platform_device *pdev)
goto out_unprep_clk;
}
+ /*
+ * Route out the IDE pins if desired.
+ * This is done by looking up a special pin control state called
+ * "ide" that will route out the IDE pins.
+ */
+ if (sg->ide_pins) {
+ ret = gemini_setup_ide_pins(dev);
+ if (ret)
+ return ret;
+ }
+
dev_info(dev, "set up the Gemini IDE/SATA nexus\n");
platform_set_drvdata(pdev, sg);
sg_singleton = sg;