Re: [PATCH 05/10] ARM: OMAP1: Make 770 LCD work, v2

[Tony Lindgren <tony@atomide.com>]

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* Andrew de Quincey <adq_dvb@lidskialf.net> [090528 11:44]:
> Quoting Tony Lindgren <tony@atomide.com>:
>
>> * Andrew de Quincey <adq_dvb@lidskialf.net> [090525 09:41]:
>>> Quoting Andrew de Quincey <adq_dvb@lidskialf.net>:
>>>
>>>> Quoting Russell King - ARM Linux <linux@arm.linux.org.uk>:
>>>>
>>>>> On Tue, May 19, 2009 at 04:37:32PM -0700, Tony Lindgren wrote:
>>>>>> Make 770 LCD work by passing the clock from platform data.
>>>>>> Also remove the old unused functions.
>>>>>
>>>>> I don't like this - because its passing struct clk's through platform
>>>>> data.  That's not how things are supposed to work.
>>>>>
>>>>> The way PXA solves this problem is to have clock aliases - see
>>>>> clk_add_alias().
>>>>
>>>> Interesting idea - I now have a prototype patch implementing this,
>>>> which I'll send when I get home (otherwise it would be an "it
>>>> compiles" "test" :)
>>>>
>>>> There isn't a common definition of clk_add_alias() though - that
>>>> symbol is defined in arch/arm/mach-pxa/clock.c, so I had to copy it
>>>> into arch/arm/plat-omap/clock.c
>>>
>>> Attached is a patch implementing this method. I don't like the
>>> duplication of the clk_alias code, but I imagine that could be resolved
>>> if this method was chosen....
>>
>> Andrew, can you please reply with your Signed-off-by?
>
> Sure - sorry I was holding off in case there were any comments on the  
> method...

I added a note about maybe moving the clk_add_alias() to
arch/arm/common/clkdev.c later.

Also noticed there were some whitespace errors, updated version below.

Regards,

Tony

> Signed-off-by: Andrew de Quincey <adq@lidskialf.net>
>

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From ad4db2847911f5847efe678d3693ca13bd3ac2ea Mon Sep 17 00:00:00 2001
From: Andrew de Quincey <adq_dvb@lidskialf.net>
Date: Thu, 28 May 2009 11:54:31 -0700
Subject: [PATCH] ARM: OMAP1: Make 770 LCD work

Make 770 LCD work by adding clk_add_alias().
Also remove the old unused functions.

Note that the clk_add_alias() could probably be moved
to arch/arm/clkdev.c later on.

Cc: linux-fbdev-devel@lists.sourceforge.net
Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com

--- a/arch/arm/mach-omap1/board-nokia770.c
+++ b/arch/arm/mach-omap1/board-nokia770.c
@@ -33,9 +33,11 @@
 #include <mach/common.h>
 #include <mach/dsp_common.h>
 #include <mach/omapfb.h>
+#include <mach/hwa742.h>
 #include <mach/lcd_mipid.h>
 #include <mach/mmc.h>
 #include <mach/usb.h>
+#include <mach/clock.h>

 #define ADS7846_PENDOWN_GPIO	15

@@ -163,6 +165,15 @@ static struct spi_board_info nokia770_spi_board_info[] __initdata = {
 	},
 };

+static struct hwa742_platform_data nokia770_hwa742_platform_data = {
+	.te_connected		= 1,
+};
+
+static void hwa742_dev_init(void)
+{
+	clk_add_alias("hwa_sys_ck", NULL, "bclk", NULL);
+	omapfb_set_ctrl_platform_data(&nokia770_hwa742_platform_data);
+}

 /* assume no Mini-AB port */

@@ -371,6 +382,7 @@ static void __init omap_nokia770_init(void)
 	omap_serial_init();
 	omap_register_i2c_bus(1, 100, NULL, 0);
 	omap_dsp_init();
+	hwa742_dev_init();
 	ads7846_dev_init();
 	mipid_dev_init();
 	omap_usb_init(&nokia770_usb_config);

diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index 29efc27..d137d42 100644
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -24,6 +24,7 @@
 #include <linux/debugfs.h>
 #include <linux/io.h>
 
+#include <asm/clkdev.h>
 #include <mach/clock.h>
 
 static LIST_HEAD(clocks);
@@ -359,6 +360,24 @@ static int __init clk_disable_unused(void)
 late_initcall(clk_disable_unused);
 #endif
 
+int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
+	struct device *dev)
+{
+	struct clk *r = clk_get(dev, id);
+	struct clk_lookup *l;
+
+	if (!r)
+		return -ENODEV;
+
+	l = clkdev_alloc(r, alias, alias_dev_name);
+	clk_put(r);
+	if (!l)
+		return -ENODEV;
+	clkdev_add(l);
+	return 0;
+}
+EXPORT_SYMBOL(clk_add_alias);
+
 int __init clk_init(struct clk_functions * custom_clocks)
 {
 	if (!custom_clocks) {
diff --git a/arch/arm/plat-omap/include/mach/clock.h b/arch/arm/plat-omap/include/mach/clock.h
index 073a2c5..cf32d1b 100644
--- a/arch/arm/plat-omap/include/mach/clock.h
+++ b/arch/arm/plat-omap/include/mach/clock.h
@@ -127,6 +127,8 @@ extern void propagate_rate(struct clk *clk);
 extern void recalculate_root_clocks(void);
 extern unsigned long followparent_recalc(struct clk *clk);
 extern void clk_enable_init_clocks(void);
+extern int clk_add_alias(const char *alias, const char *alias_dev_name,
+				char *id, struct device *dev);
 #ifdef CONFIG_CPU_FREQ
 extern void clk_init_cpufreq_table(struct cpufreq_frequency_table **table);
 #endif
diff --git a/arch/arm/plat-omap/include/mach/hwa742.h b/arch/arm/plat-omap/include/mach/hwa742.h
index 577f492..886248d 100644
--- a/arch/arm/plat-omap/include/mach/hwa742.h
+++ b/arch/arm/plat-omap/include/mach/hwa742.h
@@ -2,10 +2,6 @@
 #define _HWA742_H
 
 struct hwa742_platform_data {
-	void		(*power_up)(struct device *dev);
-	void		(*power_down)(struct device *dev);
-	unsigned long	(*get_clock_rate)(struct device *dev);
-
 	unsigned	te_connected:1;
 };
 
diff --git a/drivers/video/omap/hwa742.c b/drivers/video/omap/hwa742.c
index 8aa6e47..5d4f348 100644
--- a/drivers/video/omap/hwa742.c
+++ b/drivers/video/omap/hwa742.c
@@ -133,8 +133,7 @@ struct {
 	struct lcd_ctrl_extif	*extif;
 	struct lcd_ctrl		*int_ctrl;
 
-	void			(*power_up)(struct device *dev);
-	void			(*power_down)(struct device *dev);
+	struct clk		*sys_ck;
 } hwa742;
 
 struct lcd_ctrl hwa742_ctrl;
@@ -915,14 +914,13 @@ static void hwa742_suspend(void)
 	hwa742_set_update_mode(OMAPFB_UPDATE_DISABLED);
 	/* Enable sleep mode */
 	hwa742_write_reg(HWA742_POWER_SAVE, 1 << 1);
-	if (hwa742.power_down != NULL)
-		hwa742.power_down(hwa742.fbdev->dev);
+	clk_disable(hwa742.sys_ck);
 }
 
 static void hwa742_resume(void)
 {
-	if (hwa742.power_up != NULL)
-		hwa742.power_up(hwa742.fbdev->dev);
+	clk_enable(hwa742.sys_ck);
+
 	/* Disable sleep mode */
 	hwa742_write_reg(HWA742_POWER_SAVE, 0);
 	while (1) {
@@ -955,14 +953,13 @@ static int hwa742_init(struct omapfb_device *fbdev, int ext_mode,
 	omapfb_conf = fbdev->dev->platform_data;
 	ctrl_conf = omapfb_conf->ctrl_platform_data;
 
-	if (ctrl_conf == NULL || ctrl_conf->get_clock_rate == NULL) {
+	if (ctrl_conf == NULL) {
 		dev_err(fbdev->dev, "HWA742: missing platform data\n");
 		r = -ENOENT;
 		goto err1;
 	}
 
-	hwa742.power_down = ctrl_conf->power_down;
-	hwa742.power_up = ctrl_conf->power_up;
+	hwa742.sys_ck = clk_get(NULL, "hwa_sys_ck");
 
 	spin_lock_init(&hwa742.req_lock);
 
@@ -972,12 +969,11 @@ static int hwa742_init(struct omapfb_device *fbdev, int ext_mode,
 	if ((r = hwa742.extif->init(fbdev)) < 0)
 		goto err2;
 
-	ext_clk = ctrl_conf->get_clock_rate(fbdev->dev);
+	ext_clk = clk_get_rate(hwa742.sys_ck);
 	if ((r = calc_extif_timings(ext_clk, &extif_mem_div)) < 0)
 		goto err3;
 	hwa742.extif->set_timings(&hwa742.reg_timings);
-	if (hwa742.power_up != NULL)
-		hwa742.power_up(fbdev->dev);
+	clk_enable(hwa742.sys_ck);
 
 	calc_hwa742_clk_rates(ext_clk, &sys_clk, &pix_clk);
 	if ((r = calc_extif_timings(sys_clk, &extif_mem_div)) < 0)
@@ -1040,8 +1036,7 @@ static int hwa742_init(struct omapfb_device *fbdev, int ext_mode,
 
 	return 0;
 err4:
-	if (hwa742.power_down != NULL)
-		hwa742.power_down(fbdev->dev);
+	clk_disable(hwa742.sys_ck);
 err3:
 	hwa742.extif->cleanup();
 err2:
@@ -1055,8 +1050,7 @@ static void hwa742_cleanup(void)
 	hwa742_set_update_mode(OMAPFB_UPDATE_DISABLED);
 	hwa742.extif->cleanup();
 	hwa742.int_ctrl->cleanup();
-	if (hwa742.power_down != NULL)
-		hwa742.power_down(hwa742.fbdev->dev);
+	clk_disable(hwa742.sys_ck);
 }
 
 struct lcd_ctrl hwa742_ctrl = {