[PATCH 1/5] dm: core: Fix devfdt_get_addr_ptr return value

[Matthias Brugger <mbrugger@suse.com>]

On 27/05/2020 08:41, Ovidiu Panait wrote:
> According to the description of devfdt_get_addr_ptr, this function should
> return NULL on failure, but currently it returns (void *)FDT_ADDR_T_NONE.
> 
> This is also a problem because there are two definitions for
> dev_read_addr_ptr, depending on CONFIG_DM_DEV_READ_INLINE:
> 
> 1. one returning NULL on failure (drivers/core/read.c):
> void *dev_read_addr_ptr(const struct udevice *dev)
> {
>         fdt_addr_t addr = dev_read_addr(dev);
> 
>         return (addr == FDT_ADDR_T_NONE) ? NULL : map_sysmem(addr, 0);
> }
> 
> 2. another one, which is a wrapper over devfdt_get_addr_ptr, returning
> (void *)FDT_ADDR_T_NONE (include/dm/read.h)
> 
> static inline void *dev_read_addr_ptr(const struct udevice *dev)
> {
>         return devfdt_get_addr_ptr(dev);
> }
> 
> Currently, some drivers which make use of devfdt_get_addr_ptr check the
> return value for NULL:
> drivers/i2c/mvtwsi.c
> drivers/i2c/designware_i2c.c
> drivers/usb/host/ehci-zynq.c
> 
> while others check the return value for (void *)FDT_ADDR_T_NONE:
> drivers/pinctrl/mvebu/pinctrl-mvebu.c
> drivers/timer/ast_timer.c
> drivers/watchdog/ast_wdt.c
> 
> Fix this by making devfdt_get_addr_ptr return NULL on failure, as
> described in the function comments. Also, update the drivers currently
> checking (void *)FDT_ADDR_T_NONE to check for NULL.
> 
> Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>

Reviewed-by: Matthias Brugger <mbrugger@suse.com>

Simon can you have a look. If it's OK for you I can queue the series through my
tree.

Regards,
Matthias

> ---
> 
>  drivers/clk/aspeed/clk_ast2500.c      | 4 ++--
>  drivers/core/fdtaddr.c                | 5 ++++-
>  drivers/i2c/ast_i2c.c                 | 4 ++--
>  drivers/pinctrl/mvebu/pinctrl-mvebu.c | 2 +-
>  drivers/timer/ast_timer.c             | 4 ++--
>  drivers/watchdog/ast_wdt.c            | 4 ++--
>  6 files changed, 13 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/clk/aspeed/clk_ast2500.c b/drivers/clk/aspeed/clk_ast2500.c
> index ccfeded30c..284f5f58d6 100644
> --- a/drivers/clk/aspeed/clk_ast2500.c
> +++ b/drivers/clk/aspeed/clk_ast2500.c
> @@ -498,8 +498,8 @@ static int ast2500_clk_ofdata_to_platdata(struct udevice *dev)
>  	struct ast2500_clk_priv *priv = dev_get_priv(dev);
>  
>  	priv->scu = devfdt_get_addr_ptr(dev);
> -	if (IS_ERR(priv->scu))
> -		return PTR_ERR(priv->scu);
> +	if (!priv->scu)
> +		return -EINVAL;
>  
>  	return 0;
>  }
> diff --git a/drivers/core/fdtaddr.c b/drivers/core/fdtaddr.c
> index dfcb868f65..044d5871b0 100644
> --- a/drivers/core/fdtaddr.c
> +++ b/drivers/core/fdtaddr.c
> @@ -14,6 +14,7 @@
>  #include <log.h>
>  #include <asm/io.h>
>  #include <dm/device-internal.h>
> +#include <mapmem.h>
>  
>  DECLARE_GLOBAL_DATA_PTR;
>  
> @@ -154,7 +155,9 @@ fdt_addr_t devfdt_get_addr(const struct udevice *dev)
>  
>  void *devfdt_get_addr_ptr(const struct udevice *dev)
>  {
> -	return (void *)(uintptr_t)devfdt_get_addr_index(dev, 0);
> +	fdt_addr_t addr = devfdt_get_addr_index(dev, 0);
> +
> +	return (addr == FDT_ADDR_T_NONE) ? NULL : map_sysmem(addr, 0);
>  }
>  
>  void *devfdt_remap_addr_index(const struct udevice *dev, int index)
> diff --git a/drivers/i2c/ast_i2c.c b/drivers/i2c/ast_i2c.c
> index 214362d04b..253e653666 100644
> --- a/drivers/i2c/ast_i2c.c
> +++ b/drivers/i2c/ast_i2c.c
> @@ -93,8 +93,8 @@ static int ast_i2c_ofdata_to_platdata(struct udevice *dev)
>  	int ret;
>  
>  	priv->regs = devfdt_get_addr_ptr(dev);
> -	if (IS_ERR(priv->regs))
> -		return PTR_ERR(priv->regs);
> +	if (!priv->regs)
> +		return -EINVAL;
>  
>  	ret = clk_get_by_index(dev, 0, &priv->clk);
>  	if (ret < 0) {
> diff --git a/drivers/pinctrl/mvebu/pinctrl-mvebu.c b/drivers/pinctrl/mvebu/pinctrl-mvebu.c
> index 2206e958ec..ac0377e796 100644
> --- a/drivers/pinctrl/mvebu/pinctrl-mvebu.c
> +++ b/drivers/pinctrl/mvebu/pinctrl-mvebu.c
> @@ -194,7 +194,7 @@ int mvebu_pinctl_probe(struct udevice *dev)
>  	}
>  
>  	priv->base_reg = devfdt_get_addr_ptr(dev);
> -	if (priv->base_reg == (void *)FDT_ADDR_T_NONE) {
> +	if (!priv->base_reg) {
>  		debug("%s: Failed to get base address\n", __func__);
>  		return -EINVAL;
>  	}
> diff --git a/drivers/timer/ast_timer.c b/drivers/timer/ast_timer.c
> index 3838601f54..9f28cbfcf9 100644
> --- a/drivers/timer/ast_timer.c
> +++ b/drivers/timer/ast_timer.c
> @@ -65,8 +65,8 @@ static int ast_timer_ofdata_to_platdata(struct udevice *dev)
>  	struct ast_timer_priv *priv = dev_get_priv(dev);
>  
>  	priv->regs = devfdt_get_addr_ptr(dev);
> -	if (IS_ERR(priv->regs))
> -		return PTR_ERR(priv->regs);
> +	if (!priv->regs)
> +		return -EINVAL;
>  
>  	priv->tmc = ast_get_timer_counter(priv->regs, AST_TICK_TIMER);
>  
> diff --git a/drivers/watchdog/ast_wdt.c b/drivers/watchdog/ast_wdt.c
> index 7e11465a57..a21f9a4d14 100644
> --- a/drivers/watchdog/ast_wdt.c
> +++ b/drivers/watchdog/ast_wdt.c
> @@ -91,8 +91,8 @@ static int ast_wdt_ofdata_to_platdata(struct udevice *dev)
>  	struct ast_wdt_priv *priv = dev_get_priv(dev);
>  
>  	priv->regs = devfdt_get_addr_ptr(dev);
> -	if (IS_ERR(priv->regs))
> -		return PTR_ERR(priv->regs);
> +	if (!priv->regs)
> +		return -EINVAL;
>  
>  	return 0;
>  }
>