[PATCH v4 03/39] mmc: msm_sdhci: use modern clock handling

[Caleb Connolly]

Use the clk_* helper functions and the correct property name for clocks.

Reviewed-by: Neil Armstrong <neil.armstrong at linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
---
 drivers/mmc/msm_sdhci.c | 69 +++++++++++++++++++++++++++++++++----------------
 1 file changed, 47 insertions(+), 22 deletions(-)

diff --git a/drivers/mmc/msm_sdhci.c b/drivers/mmc/msm_sdhci.c
index fe1e754bfde0..b63538fce20c 100644
--- a/drivers/mmc/msm_sdhci.c
+++ b/drivers/mmc/msm_sdhci.c
@@ -44,6 +44,7 @@ struct msm_sdhc_plat {
 struct msm_sdhc {
 	struct sdhci_host host;
 	void *base;
+	struct clk_bulk clks;
 };
 
 struct msm_sdhc_variant_info {
@@ -54,35 +55,57 @@ DECLARE_GLOBAL_DATA_PTR;
 
 static int msm_sdc_clk_init(struct udevice *dev)
 {
-	int node = dev_of_offset(dev);
-	uint clk_rate = fdtdec_get_uint(gd->fdt_blob, node, "clock-frequency",
-					400000);
-	uint clkd[2]; /* clk_id and clk_no */
-	int clk_offset;
-	struct udevice *clk_dev;
-	struct clk clk;
-	int ret;
+	struct msm_sdhc *prv = dev_get_priv(dev);
+	ofnode node = dev_ofnode(dev);
+	uint clk_rate;
+	int ret, i = 0, n_clks;
+	const char *clk_name;
 
-	ret = fdtdec_get_int_array(gd->fdt_blob, node, "clock", clkd, 2);
+	ret = ofnode_read_u32(node, "clock-frequency", &clk_rate);
 	if (ret)
-		return ret;
+		clk_rate = 400000;
 
-	clk_offset = fdt_node_offset_by_phandle(gd->fdt_blob, clkd[0]);
-	if (clk_offset < 0)
-		return clk_offset;
-
-	ret = uclass_get_device_by_of_offset(UCLASS_CLK, clk_offset, &clk_dev);
-	if (ret)
+	ret = clk_get_bulk(dev, &prv->clks);
+	if (ret) {
+		log_warning("Couldn't get mmc clocks: %d\n", ret);
 		return ret;
+	}
 
-	clk.id = clkd[1];
-	ret = clk_request(clk_dev, &clk);
-	if (ret < 0)
+	ret = clk_enable_bulk(&prv->clks);
+	if (ret) {
+		log_warning("Couldn't enable mmc clocks: %d\n", ret);
 		return ret;
+	}
 
-	ret = clk_set_rate(&clk, clk_rate);
-	if (ret < 0)
-		return ret;
+	/* If clock-names is unspecified, then the first clock is the core clock */
+	if (!ofnode_get_property(node, "clock-names", &n_clks)) {
+		if (!clk_set_rate(&prv->clks.clks[0], clk_rate)) {
+			log_warning("Couldn't set core clock rate: %d\n", ret);
+			return -EINVAL;
+		}
+	}
+
+	/* Find the index of the "core" clock */
+	while (i < n_clks) {
+		ofnode_read_string_index(node, "clock-names", i, &clk_name);
+		if (!strcmp(clk_name, "core"))
+			break;
+		i++;
+	}
+
+	if (i >= prv->clks.count) {
+		log_warning("Couldn't find core clock (index %d but only have %d clocks)\n", i,
+		       prv->clks.count);
+		return -EINVAL;
+	}
+
+	/* The clock is already enabled by the clk_bulk above */
+	ret = clk_set_rate(&prv->clks.clks[i], clk_rate);
+	/* If we get a rate of 0 then something has probably gone wrong. */
+	if (ret == 0) {
+		log_warning("Couldn't set core clock rate to %u! Driver returned rate of 0\n", clk_rate);
+		return -EINVAL;
+	}
 
 	return 0;
 }
@@ -187,6 +210,8 @@ static int msm_sdc_remove(struct udevice *dev)
 	if (!var_info->mci_removed)
 		writel(0, priv->base + SDCC_MCI_HC_MODE);
 
+	clk_release_bulk(&priv->clks);
+
 	return 0;
 }
 

-- 
2.43.1