[PATCH v2 5/8] mmc: sdhci-pxav2: add optional core clock

[Doug Brown <doug@schmorgal.com>]

Add ability to have an optional core clock just like the pxav3 driver.
The PXA168 needs this because its SDHC controllers have separate core
and io clocks that both need to be enabled. This also correctly matches
the documented devicetree bindings for this driver.

Signed-off-by: Doug Brown <doug@schmorgal.com>
---
 drivers/mmc/host/sdhci-pxav2.c | 40 ++++++++++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pxav2.c b/drivers/mmc/host/sdhci-pxav2.c
index 509ba5dd4a4a..1f0c3028987a 100644
--- a/drivers/mmc/host/sdhci-pxav2.c
+++ b/drivers/mmc/host/sdhci-pxav2.c
@@ -41,6 +41,10 @@
 #define MMC_CARD		0x1000
 #define MMC_WIDTH		0x0100
 
+struct sdhci_pxav2_host {
+	struct clk *clk_core;
+};
+
 static void pxav2_reset(struct sdhci_host *host, u8 mask)
 {
 	struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
@@ -176,6 +180,7 @@ static int sdhci_pxav2_probe(struct platform_device *pdev)
 {
 	struct sdhci_pltfm_host *pltfm_host;
 	struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
+	struct sdhci_pxav2_host *pxav2_host;
 	struct device *dev = &pdev->dev;
 	struct sdhci_host *host = NULL;
 	const struct of_device_id *match;
@@ -183,11 +188,12 @@ static int sdhci_pxav2_probe(struct platform_device *pdev)
 	int ret;
 	struct clk *clk;
 
-	host = sdhci_pltfm_init(pdev, NULL, 0);
+	host = sdhci_pltfm_init(pdev, NULL, sizeof(*pxav2_host));
 	if (IS_ERR(host))
 		return PTR_ERR(host);
 
 	pltfm_host = sdhci_priv(host);
+	pxav2_host = sdhci_pltfm_priv(pltfm_host);
 
 	clk = devm_clk_get(dev, "io");
 	if (IS_ERR(clk))
@@ -204,6 +210,15 @@ static int sdhci_pxav2_probe(struct platform_device *pdev)
 		goto free;
 	}
 
+	pxav2_host->clk_core = devm_clk_get(dev, "core");
+	if (!IS_ERR(pxav2_host->clk_core)) {
+		ret = clk_prepare_enable(pxav2_host->clk_core);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to enable core clock\n");
+			goto disable_io_clk;
+		}
+	}
+
 	host->quirks = SDHCI_QUIRK_BROKEN_ADMA
 		| SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
 		| SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
@@ -240,17 +255,34 @@ static int sdhci_pxav2_probe(struct platform_device *pdev)
 
 	ret = sdhci_add_host(host);
 	if (ret)
-		goto disable_clk;
+		goto disable_core_clk;
 
 	return 0;
 
-disable_clk:
+disable_core_clk:
+	if (!IS_ERR(pxav2_host->clk_core))
+		clk_disable_unprepare(pxav2_host->clk_core);
+disable_io_clk:
 	clk_disable_unprepare(clk);
 free:
 	sdhci_pltfm_free(pdev);
 	return ret;
 }
 
+static int sdhci_pxav2_remove(struct platform_device *pdev)
+{
+	struct sdhci_host *host = platform_get_drvdata(pdev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_pxav2_host *pxav2_host = sdhci_pltfm_priv(pltfm_host);
+
+	int ret = sdhci_pltfm_unregister(pdev);
+
+	if (!IS_ERR(pxav2_host->clk_core))
+		clk_disable_unprepare(pxav2_host->clk_core);
+
+	return ret;
+}
+
 static struct platform_driver sdhci_pxav2_driver = {
 	.driver		= {
 		.name	= "sdhci-pxav2",
@@ -259,7 +291,7 @@ static struct platform_driver sdhci_pxav2_driver = {
 		.pm	= &sdhci_pltfm_pmops,
 	},
 	.probe		= sdhci_pxav2_probe,
-	.remove		= sdhci_pltfm_unregister,
+	.remove		= sdhci_pxav2_remove,
 };
 
 module_platform_driver(sdhci_pxav2_driver);
-- 
2.34.1