mmc: sdhci_am654: Add support for clkbuf_sel property

Add support for writing new clkbuf_sel property for the J721e 4 bit IP.
Signed-off-by: NFaiz Abbas <faiz_abbas@ti.com>
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Link: https://lore.kernel.org/r/20200619125801.9530-7-faiz_abbas@ti.comSigned-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci_am654.c

@@ -47,6 +47,8 @@
 #define SEL100_MASK		BIT(SEL100_SHIFT)
 #define FREQSEL_SHIFT		8
 #define FREQSEL_MASK		GENMASK(10, 8)
+#define CLKBUFSEL_SHIFT		0
+#define CLKBUFSEL_MASK		GENMASK(2, 0)
 #define DLL_TRIM_ICP_SHIFT	4
 #define DLL_TRIM_ICP_MASK	GENMASK(7, 4)
 #define DR_TY_SHIFT		20
@@ -86,6 +88,7 @@ struct sdhci_am654_data {
 	struct regmap *base;
 	bool legacy_otapdly;
 	int otap_del_sel[11];
+	int clkbuf_sel;
 	int trm_icp;
 	int drv_strength;
 	bool dll_on;
@@ -238,6 +241,9 @@ static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock)
 		regmap_update_bits(sdhci_am654->base, PHY_CTRL5,
 				   SELDLYTXCLK_MASK, 1 << SELDLYTXCLK_SHIFT);
 	}
+
+	regmap_update_bits(sdhci_am654->base, PHY_CTRL5, CLKBUFSEL_MASK,
+			   sdhci_am654->clkbuf_sel);
 }
 
 static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host,
@@ -260,6 +266,9 @@ static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host,
 	      (otap_del_sel << OTAPDLYSEL_SHIFT);
 	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val);
 
+	regmap_update_bits(sdhci_am654->base, PHY_CTRL5, CLKBUFSEL_MASK,
+			   sdhci_am654->clkbuf_sel);
+
 	sdhci_set_clock(host, clock);
 }
 
@@ -582,6 +591,8 @@ static int sdhci_am654_get_of_property(struct platform_device *pdev,
 	}
 
 	device_property_read_u32(dev, "ti,strobe-sel", &sdhci_am654->strb_sel);
+	device_property_read_u32(dev, "ti,clkbuf-sel",
+				 &sdhci_am654->clkbuf_sel);
 
 	sdhci_get_of_property(pdev);