[01/36] ARM: samsung: make S3C24XX_MISCCR access indirect
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Message ID 20191010203043.1241612-1-arnd@arndb.de
State Under Review
Headers show
Series
  • ARM: samsung platform cleanup
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Commit Message

Arnd Bergmann Oct. 10, 2019, 8:29 p.m. UTC
The clk driver uses both a function call into an exported
platform file and a direct register access to a hardcoded
virtual address for accessing the MISCCR register, both
become are a problem for a multiplatform kernel because
of the header file dependency.

Make this an indirect function call through platform data
instead.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/mach-s3c24xx/common.c         |  3 +++
 drivers/clk/samsung/clk-s3c2410-dclk.c | 10 ++++------
 2 files changed, 7 insertions(+), 6 deletions(-)

Comments

Tomasz Figa Oct. 15, 2019, 2:52 p.m. UTC | #1
Hi Arnd,

2019年10月11日(金) 5:30 Arnd Bergmann <arnd@arndb.de>:
>
> The clk driver uses both a function call into an exported
> platform file and a direct register access to a hardcoded
> virtual address for accessing the MISCCR register, both
> become are a problem for a multiplatform kernel because
> of the header file dependency.
>
> Make this an indirect function call through platform data
> instead.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  arch/arm/mach-s3c24xx/common.c         |  3 +++
>  drivers/clk/samsung/clk-s3c2410-dclk.c | 10 ++++------
>  2 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/mach-s3c24xx/common.c b/arch/arm/mach-s3c24xx/common.c
> index 3dc029c2d2cb..ebf6bde67816 100644
> --- a/arch/arm/mach-s3c24xx/common.c
> +++ b/arch/arm/mach-s3c24xx/common.c
> @@ -667,5 +667,8 @@ struct platform_device s3c2410_device_dclk = {
>         .id             = 0,
>         .num_resources  = ARRAY_SIZE(s3c2410_dclk_resource),
>         .resource       = s3c2410_dclk_resource,
> +       .dev            = {
> +               .platform_data = s3c2410_modify_misccr,

Thanks for the patch!

Just one minor nit: It doesn't look very nice to pass a function
pointer directly as platform data. Could we have a struct defined
instead - with a kerneldoc comment describing the function pointer
field?

Best regards,
Tomasz

Patch
diff mbox series

diff --git a/arch/arm/mach-s3c24xx/common.c b/arch/arm/mach-s3c24xx/common.c
index 3dc029c2d2cb..ebf6bde67816 100644
--- a/arch/arm/mach-s3c24xx/common.c
+++ b/arch/arm/mach-s3c24xx/common.c
@@ -667,5 +667,8 @@  struct platform_device s3c2410_device_dclk = {
 	.id		= 0,
 	.num_resources	= ARRAY_SIZE(s3c2410_dclk_resource),
 	.resource	= s3c2410_dclk_resource,
+	.dev		= {
+		.platform_data = s3c2410_modify_misccr,
+	},
 };
 #endif
diff --git a/drivers/clk/samsung/clk-s3c2410-dclk.c b/drivers/clk/samsung/clk-s3c2410-dclk.c
index 1281672cb00e..fbcec0252c45 100644
--- a/drivers/clk/samsung/clk-s3c2410-dclk.c
+++ b/drivers/clk/samsung/clk-s3c2410-dclk.c
@@ -14,10 +14,6 @@ 
 #include <linux/module.h>
 #include "clk.h"
 
-/* legacy access to misccr, until dt conversion is finished */
-#include <mach/hardware.h>
-#include <mach/regs-gpio.h>
-
 #define MUX_DCLK0	0
 #define MUX_DCLK1	1
 #define DIV_DCLK0	2
@@ -52,6 +48,7 @@  struct s3c24xx_clkout {
 	struct clk_hw		hw;
 	u32			mask;
 	u8			shift;
+	unsigned int (*modify_misccr)(unsigned int clr, unsigned int chg);
 };
 
 #define to_s3c24xx_clkout(_hw) container_of(_hw, struct s3c24xx_clkout, hw)
@@ -62,7 +59,7 @@  static u8 s3c24xx_clkout_get_parent(struct clk_hw *hw)
 	int num_parents = clk_hw_get_num_parents(hw);
 	u32 val;
 
-	val = readl_relaxed(S3C24XX_MISCCR) >> clkout->shift;
+	val = clkout->modify_misccr(0, 0) >> clkout->shift;
 	val >>= clkout->shift;
 	val &= clkout->mask;
 
@@ -76,7 +73,7 @@  static int s3c24xx_clkout_set_parent(struct clk_hw *hw, u8 index)
 {
 	struct s3c24xx_clkout *clkout = to_s3c24xx_clkout(hw);
 
-	s3c2410_modify_misccr((clkout->mask << clkout->shift),
+	clkout->modify_misccr((clkout->mask << clkout->shift),
 			      (index << clkout->shift));
 
 	return 0;
@@ -110,6 +107,7 @@  static struct clk_hw *s3c24xx_register_clkout(struct device *dev,
 	clkout->shift = shift;
 	clkout->mask = mask;
 	clkout->hw.init = &init;
+	clkout->modify_misccr = dev->platform_data;
 
 	ret = clk_hw_register(dev, &clkout->hw);
 	if (ret)