MIPS: TXx9: Convert to Common Clock Framework

Replace the custom minimal clock implementation for Toshiba TXx9 by a
basic implementation using the Common Clock Framework.

The only clocks that are provided are those needed by TXx9-specific
drivers ("imbus" and "spi" (TX4938 only)), and their common parent
clock "gbus". Other clocks can be added when needed.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Reviewed-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Wim Van Sebroeck <wim@iguana.be>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: linux-clk@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-watchdog@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14239/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/txx9/Kconfig

@@ -20,7 +20,7 @@ config MACH_TXX9
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_LITTLE_ENDIAN
 	select SYS_SUPPORTS_BIG_ENDIAN
-	select HAVE_CLK
+	select COMMON_CLK
 
 config TOSHIBA_JMR3927
 	bool "Toshiba JMR-TX3927 board"

arch/mips/txx9/generic/setup.c

@@ -15,7 +15,8 @@
 #include <linux/interrupt.h>
 #include <linux/string.h>
 #include <linux/module.h>
-#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
 #include <linux/err.h>
 #include <linux/gpio/driver.h>
 #include <linux/platform_device.h>
@@ -83,40 +84,6 @@ int txx9_ccfg_toeon __initdata;
 int txx9_ccfg_toeon __initdata = 1;
 #endif
 
-/* Minimum CLK support */
-
-struct clk *clk_get(struct device *dev, const char *id)
-{
-	if (!strcmp(id, "spi-baseclk"))
-		return (struct clk *)((unsigned long)txx9_gbus_clock / 2 / 2);
-	if (!strcmp(id, "imbus_clk"))
-		return (struct clk *)((unsigned long)txx9_gbus_clock / 2);
-	return ERR_PTR(-ENOENT);
-}
-EXPORT_SYMBOL(clk_get);
-
-int clk_enable(struct clk *clk)
-{
-	return 0;
-}
-EXPORT_SYMBOL(clk_enable);
-
-void clk_disable(struct clk *clk)
-{
-}
-EXPORT_SYMBOL(clk_disable);
-
-unsigned long clk_get_rate(struct clk *clk)
-{
-	return (unsigned long)clk;
-}
-EXPORT_SYMBOL(clk_get_rate);
-
-void clk_put(struct clk *clk)
-{
-}
-EXPORT_SYMBOL(clk_put);
-
 #define BOARD_VEC(board)	extern struct txx9_board_vec board;
 #include <asm/txx9/boards.h>
 #undef BOARD_VEC
@@ -560,8 +527,41 @@ void __init plat_time_init(void)
 	txx9_board_vec->time_init();
 }
 
+static void txx9_clk_init(void)
+{
+	struct clk_hw *hw;
+	int error;
+
+	hw = clk_hw_register_fixed_rate(NULL, "gbus", NULL, 0, txx9_gbus_clock);
+	if (IS_ERR(hw)) {
+		error = PTR_ERR(hw);
+		goto fail;
+	}
+
+	hw = clk_hw_register_fixed_factor(NULL, "imbus", "gbus", 0, 1, 2);
+	error = clk_hw_register_clkdev(hw, "imbus_clk", NULL);
+	if (error)
+		goto fail;
+
+#ifdef CONFIG_CPU_TX49XX
+	if (TX4938_REV_PCODE() == 0x4938) {
+		hw = clk_hw_register_fixed_factor(NULL, "spi", "gbus", 0, 1, 4);
+		error = clk_hw_register_clkdev(hw, "spi-baseclk", NULL);
+		if (error)
+			goto fail;
+	}
+#endif
+
+	return;
+
+fail:
+	pr_err("Failed to register clocks: %d\n", error);
+}
+
 static int __init _txx9_arch_init(void)
 {
+	txx9_clk_init();
+
 	if (txx9_board_vec->arch_init)
 		txx9_board_vec->arch_init();
 	return 0;