RFC[PATCH 6/6] ARM: S5P64X0: Add clkdev bus lookup support

[Rajeshwari Shinde <rajeshwari.s@samsung.com>]

Bus clock alias names created and added to clkdev which will be used
by HSMMC driver.

Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
---
 .../include/mach/s5p64x0-common-sdhci.h            |    2 +
 arch/arm/mach-s5p64x0/mach-smdk6440.c              |    5 ++
 arch/arm/mach-s5p64x0/mach-smdk6450.c              |    5 ++
 arch/arm/mach-s5p64x0/s5p64x0-common-sdhci.c       |    7 +++
 arch/arm/plat-samsung/Makefile                     |    1 +
 arch/arm/plat-samsung/clkdev-busalias.c            |   44 ++++++++++++++++++++
 arch/arm/plat-samsung/include/plat/sdhci.h         |    8 ++++
 7 files changed, 72 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/plat-samsung/clkdev-busalias.c

diff --git a/arch/arm/mach-s5p64x0/include/mach/s5p64x0-common-sdhci.h b/arch/arm/mach-s5p64x0/include/mach/s5p64x0-common-sdhci.h
index a3381f0..b81e6dd 100644
--- a/arch/arm/mach-s5p64x0/include/mach/s5p64x0-common-sdhci.h
+++ b/arch/arm/mach-s5p64x0/include/mach/s5p64x0-common-sdhci.h
@@ -10,6 +10,8 @@
 
 #include <plat/sdhci.h>
 
+extern char *hsmmc_busclksrcs[4];
+
 extern struct s3c_sdhci_platdata smdk64x0_hsmmc0_pdata;
 extern struct s3c_sdhci_platdata smdk64x0_hsmmc1_pdata;
 extern struct s3c_sdhci_platdata smdk64x0_hsmmc2_pdata;
diff --git a/arch/arm/mach-s5p64x0/mach-smdk6440.c b/arch/arm/mach-s5p64x0/mach-smdk6440.c
index 065977f..ad1b49d 100644
--- a/arch/arm/mach-s5p64x0/mach-smdk6440.c
+++ b/arch/arm/mach-s5p64x0/mach-smdk6440.c
@@ -177,6 +177,11 @@ static void __init smdk6440_machine_init(void)
 	s3c_sdhci2_set_platdata(&smdk64x0_hsmmc2_pdata);
 
 	platform_add_devices(smdk6440_devices, ARRAY_SIZE(smdk6440_devices));
+
+	/* create alias for clocks required by SDHCI */
+	s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc0, hsmmc_busclksrcs);
+	s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc1, hsmmc_busclksrcs);
+	s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc2, hsmmc_busclksrcs);
 }
 
 MACHINE_START(SMDK6440, "SMDK6440")
diff --git a/arch/arm/mach-s5p64x0/mach-smdk6450.c b/arch/arm/mach-s5p64x0/mach-smdk6450.c
index 9e6fcef..f3f656e 100644
--- a/arch/arm/mach-s5p64x0/mach-smdk6450.c
+++ b/arch/arm/mach-s5p64x0/mach-smdk6450.c
@@ -196,6 +196,11 @@ static void __init smdk6450_machine_init(void)
 	s3c_sdhci2_set_platdata(&smdk64x0_hsmmc2_pdata);
 
 	platform_add_devices(smdk6450_devices, ARRAY_SIZE(smdk6450_devices));
+
+	/* create alias for clocks required by SDHCI */
+	s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc0, hsmmc_busclksrcs);
+	s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc1, hsmmc_busclksrcs);
+	s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc2, hsmmc_busclksrcs);
 }
 
 MACHINE_START(SMDK6450, "SMDK6450")
diff --git a/arch/arm/mach-s5p64x0/s5p64x0-common-sdhci.c b/arch/arm/mach-s5p64x0/s5p64x0-common-sdhci.c
index 03d89f6..9721b2d 100644
--- a/arch/arm/mach-s5p64x0/s5p64x0-common-sdhci.c
+++ b/arch/arm/mach-s5p64x0/s5p64x0-common-sdhci.c
@@ -14,6 +14,13 @@
 
 #include <mach/s5p64x0-common-sdhci.h>
 
+char *hsmmc_busclksrcs[4] = {
+	[0] = NULL,
+	[1] = NULL,
+	[2] = "sclk_mmc", /* mmc bus clock */
+	[3] = NULL,
+};
+
 struct s3c_sdhci_platdata smdk64x0_hsmmc0_pdata __initdata = {
 	.cd_type        = S3C_SDHCI_CD_NONE,
 	.clk_type       = S3C_SDHCI_CLK_DIV_EXTERNAL,
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index 853764b..0aae4fa 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_S3C_ADC)	+= adc.o
 # devices
 
 obj-y				+= platformdata.o
+obj-y				+= clkdev-busalias.o
 
 obj-$(CONFIG_S3C_DEV_HSMMC)	+= dev-hsmmc.o
 obj-$(CONFIG_S3C_DEV_HSMMC1)	+= dev-hsmmc1.o
diff --git a/arch/arm/plat-samsung/clkdev-busalias.c b/arch/arm/plat-samsung/clkdev-busalias.c
new file mode 100644
index 0000000..3e085a2
--- /dev/null
+++ b/arch/arm/plat-samsung/clkdev-busalias.c
@@ -0,0 +1,44 @@
+/* linux/arch/arm/plat-samsung/clkdev_busalias.c
+ *
+ * Copyright (c) 2011 Simtec Electronics
+ *	http://www.samsung.com
+ *
+ * Helper function to add clkdev bus clocks alias names.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+
+#include <plat/sdhci.h>
+
+#define MAX_BUS_CLK (4)
+
+void s3c_sdhci_add_busclk_alias(struct platform_device *pdev,
+				char **mmc_busclks)
+{
+	int clk_cnt = 0, ptr;
+	char devname[14];
+
+	sprintf(devname, "s3c-sdhci.%d", pdev->id);
+
+	for (ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
+		char *bus_name = mmc_busclks[ptr];
+
+		if (bus_name != NULL) {
+			char name[14];
+			sprintf(name, "mmc_busclk.%d", ptr);
+			clk_add_alias(name, devname, bus_name,
+					&pdev->dev);
+			clk_cnt++;
+		}
+	}
+
+	if (clk_cnt == 0)
+		dev_err(&pdev->dev, "No MMC bus clocks!");
+}
diff --git a/arch/arm/plat-samsung/include/plat/sdhci.h b/arch/arm/plat-samsung/include/plat/sdhci.h
index dde13aa..4933b6a 100644
--- a/arch/arm/plat-samsung/include/plat/sdhci.h
+++ b/arch/arm/plat-samsung/include/plat/sdhci.h
@@ -131,6 +131,14 @@ extern void s5p64x0_setup_sdhci1_cfg_gpio(struct platform_device *, int w);
 extern void s5p6440_setup_sdhci2_cfg_gpio(struct platform_device *, int w);
 extern void s5p6450_setup_sdhci2_cfg_gpio(struct platform_device *, int w);
 
+/*
+ * s3c_sdhci_set_busclk - Add alias to bus clocks supported, for clkdev support.
+ * @pdev: platform device to which the busclks are to be initialised.
+ * @mmc_busclks: Bus clocks suppored by SDHCI
+*/
+extern void s3c_sdhci_add_busclk_alias(struct platform_device *pdev,
+					char **mmc_busclks);
+
 /* S3C2416 SDHCI setup */
 
 #ifdef CONFIG_S3C2416_SETUP_SDHCI
-- 
1.7.4.4