linux-kernel - [PATCH v4 7/8] wlcore: sdio: get clocks from device tree

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Message-ID: <1375189476-21557-8-git-send-email-coelho@ti.com>
Date:	Tue, 30 Jul 2013 16:04:35 +0300
From:	Luciano Coelho <coelho@...com>
To:	<linux-wireless@...r.kernel.org>, <tony@...mide.com>,
	<nsekhar@...com>
CC:	<coelho@...com>, <luca@...lho.fi>, <mturquette@...aro.org>,
	<mark.rutland@....com>, <balbi@...com>, <grant.likely@...aro.org>,
	<rob.herring@...xeda.com>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <nm@...com>,
	<martinez.javier@...il.com>
Subject: [PATCH v4 7/8] wlcore: sdio: get clocks from device tree

Read the clock nodes from the device tree and use them to set the
frequency for the refclock and the tcxo clock.

Also, call sdio_set_drvdata() earlier, so the glue is already set in
the driver data when we call wlcore_get_pdata_from_of() and we don't
need to pass it as a parameter.

Signed-off-by: Luciano Coelho <coelho@...com>
Reviewed-by: Felipe Balbi <balbi@...com>
---
 drivers/net/wireless/ti/wlcore/sdio.c | 36 +++++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ti/wlcore/sdio.c b/drivers/net/wireless/ti/wlcore/sdio.c
index 980bf3d..60fce49 100644
--- a/drivers/net/wireless/ti/wlcore/sdio.c
+++ b/drivers/net/wireless/ti/wlcore/sdio.c
@@ -53,6 +53,7 @@ static bool dump = false;
 struct wl12xx_sdio_glue {
 	struct device *dev;
 	struct platform_device *core;
+	struct clk *refclock, *tcxoclock;
 };
 
 static const struct sdio_device_id wl1271_devices[] = {
@@ -224,6 +225,7 @@ static struct wl12xx_platform_data *wlcore_get_pdata_from_of(struct device *dev)
 	struct wl12xx_platform_data *pdata;
 	struct device_node *np = dev->of_node;
 	struct device_node *clock_node;
+	struct wl12xx_sdio_glue *glue = sdio_get_drvdata(dev_to_sdio_func(dev));
 
 	if (!np) {
 		np = of_find_matching_node(NULL, dev->driver->of_match_table);
@@ -250,6 +252,26 @@ static struct wl12xx_platform_data *wlcore_get_pdata_from_of(struct device *dev)
 	for_each_matching_node(clock_node, wlcore_sdio_of_clk_match_table)
 		of_fixed_clk_setup(clock_node);
 
+	/* TODO: make sure we have this when needed (ie. for WL6 and WL7) */
+	glue->refclock = of_clk_get_by_name(np, "refclock");
+	if (IS_ERR(glue->refclock)) {
+		dev_err(dev, "couldn't find refclock on the device tree\n");
+		glue->refclock = NULL;
+	} else {
+		clk_prepare_enable(glue->refclock);
+		pdata->ref_clock_freq = clk_get_rate(glue->refclock);
+	}
+
+	/* TODO: make sure we have this when needed (ie. for WL7) */
+	glue->tcxoclock = of_clk_get_by_name(np, "tcxoclock");
+	if (IS_ERR(glue->tcxoclock)) {
+		dev_err(dev, "couldn't find tcxoclock on the device tree\n");
+		glue->tcxoclock = NULL;
+	} else {
+		clk_prepare_enable(glue->tcxoclock);
+		pdata->ref_clock_freq = clk_get_rate(glue->tcxoclock);
+	}
+
 	goto out;
 
 out_free:
@@ -294,6 +316,8 @@ static int wl1271_probe(struct sdio_func *func,
 	/* Use block mode for transferring over one block size of data */
 	func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
 
+	sdio_set_drvdata(func, glue);
+
 	/* The pdata allocated here is freed when the device is freed,
 	 * so we don't need an additional out label to free it in case
 	 * of error further on.
@@ -319,8 +343,6 @@ static int wl1271_probe(struct sdio_func *func,
 	if (mmcflags & MMC_PM_KEEP_POWER)
 		pdev_data->pwr_in_suspend = true;
 
-	sdio_set_drvdata(func, glue);
-
 	/* Tell PM core that we don't need the card to be powered now */
 	pm_runtime_put_noidle(&func->dev);
 
@@ -387,6 +409,16 @@ static void wl1271_remove(struct sdio_func *func)
 {
 	struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);
 
+	if (glue->refclock) {
+		clk_disable_unprepare(glue->refclock);
+		clk_put(glue->refclock);
+	}
+
+	if (glue->tcxoclock) {
+		clk_disable_unprepare(glue->tcxoclock);
+		clk_put(glue->tcxoclock);
+	}
+
 	/* Undo decrement done above in wl1271_probe */
 	pm_runtime_get_noresume(&func->dev);
 
-- 
1.8.3.2

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