diff mbox series

[1/2] fbdev/simplefb: Support memory-region property

Message ID 20231011143809.1108034-2-thierry.reding@gmail.com (mailing list archive)
State New, archived
Headers show
Series fbdev/simplefb: Add missing simple-framebuffer features | expand

Commit Message

Thierry Reding Oct. 11, 2023, 2:38 p.m. UTC 
From: Thierry Reding <treding@nvidia.com>

The simple-framebuffer bindings specify that the "memory-region"
property can be used as an alternative to the "reg" property to define
the framebuffer memory used by the display hardware. Implement support
for this in the simplefb driver.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 drivers/video/fbdev/simplefb.c | 35 +++++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

Comments

Hans de Goede Oct. 26, 2023, 12:31 p.m. UTC | #1 
Hi,

On 10/11/23 16:38, Thierry Reding wrote:
> From: Thierry Reding <treding@nvidia.com>
> 
> The simple-framebuffer bindings specify that the "memory-region"
> property can be used as an alternative to the "reg" property to define
> the framebuffer memory used by the display hardware. Implement support
> for this in the simplefb driver.
> 
> Signed-off-by: Thierry Reding <treding@nvidia.com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@redhat.com>

Regards,

Hans


> ---
>  drivers/video/fbdev/simplefb.c | 35 +++++++++++++++++++++++++++++-----
>  1 file changed, 30 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/video/fbdev/simplefb.c b/drivers/video/fbdev/simplefb.c
> index 62f99f6fccd3..18025f34fde7 100644
> --- a/drivers/video/fbdev/simplefb.c
> +++ b/drivers/video/fbdev/simplefb.c
> @@ -21,6 +21,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/clk.h>
>  #include <linux/of.h>
> +#include <linux/of_address.h>
>  #include <linux/of_clk.h>
>  #include <linux/of_platform.h>
>  #include <linux/parser.h>
> @@ -121,12 +122,13 @@ struct simplefb_params {
>  	u32 height;
>  	u32 stride;
>  	struct simplefb_format *format;
> +	struct resource memory;
>  };
>  
>  static int simplefb_parse_dt(struct platform_device *pdev,
>  			   struct simplefb_params *params)
>  {
> -	struct device_node *np = pdev->dev.of_node;
> +	struct device_node *np = pdev->dev.of_node, *mem;
>  	int ret;
>  	const char *format;
>  	int i;
> @@ -166,6 +168,23 @@ static int simplefb_parse_dt(struct platform_device *pdev,
>  		return -EINVAL;
>  	}
>  
> +	mem = of_parse_phandle(np, "memory-region", 0);
> +	if (mem) {
> +		ret = of_address_to_resource(mem, 0, &params->memory);
> +		if (ret < 0) {
> +			dev_err(&pdev->dev, "failed to parse memory-region\n");
> +			of_node_put(mem);
> +			return ret;
> +		}
> +
> +		if (of_property_present(np, "reg"))
> +			dev_warn(&pdev->dev, "preferring \"memory-region\" over \"reg\" property\n");
> +
> +		of_node_put(mem);
> +	} else {
> +		memset(&params->memory, 0, sizeof(params->memory));
> +	}
> +
>  	return 0;
>  }
>  
> @@ -193,6 +212,8 @@ static int simplefb_parse_pd(struct platform_device *pdev,
>  		return -EINVAL;
>  	}
>  
> +	memset(&params->memory, 0, sizeof(params->memory));
> +
>  	return 0;
>  }
>  
> @@ -431,10 +452,14 @@ static int simplefb_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!res) {
> -		dev_err(&pdev->dev, "No memory resource\n");
> -		return -EINVAL;
> +	if (params.memory.start == 0 && params.memory.end == 0) {
> +		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +		if (!res) {
> +			dev_err(&pdev->dev, "No memory resource\n");
> +			return -EINVAL;
> +		}
> +	} else {
> +		res = &params.memory;
>  	}
>  
>  	mem = request_mem_region(res->start, resource_size(res), "simplefb");
diff mbox series

Patch

diff --git a/drivers/video/fbdev/simplefb.c b/drivers/video/fbdev/simplefb.c
index 62f99f6fccd3..18025f34fde7 100644
--- a/drivers/video/fbdev/simplefb.c
+++ b/drivers/video/fbdev/simplefb.c
@@ -21,6 +21,7 @@ 
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/of_clk.h>
 #include <linux/of_platform.h>
 #include <linux/parser.h>
@@ -121,12 +122,13 @@  struct simplefb_params {
 	u32 height;
 	u32 stride;
 	struct simplefb_format *format;
+	struct resource memory;
 };
 
 static int simplefb_parse_dt(struct platform_device *pdev,
 			   struct simplefb_params *params)
 {
-	struct device_node *np = pdev->dev.of_node;
+	struct device_node *np = pdev->dev.of_node, *mem;
 	int ret;
 	const char *format;
 	int i;
@@ -166,6 +168,23 @@  static int simplefb_parse_dt(struct platform_device *pdev,
 		return -EINVAL;
 	}
 
+	mem = of_parse_phandle(np, "memory-region", 0);
+	if (mem) {
+		ret = of_address_to_resource(mem, 0, &params->memory);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "failed to parse memory-region\n");
+			of_node_put(mem);
+			return ret;
+		}
+
+		if (of_property_present(np, "reg"))
+			dev_warn(&pdev->dev, "preferring \"memory-region\" over \"reg\" property\n");
+
+		of_node_put(mem);
+	} else {
+		memset(&params->memory, 0, sizeof(params->memory));
+	}
+
 	return 0;
 }
 
@@ -193,6 +212,8 @@  static int simplefb_parse_pd(struct platform_device *pdev,
 		return -EINVAL;
 	}
 
+	memset(&params->memory, 0, sizeof(params->memory));
+
 	return 0;
 }
 
@@ -431,10 +452,14 @@  static int simplefb_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "No memory resource\n");
-		return -EINVAL;
+	if (params.memory.start == 0 && params.memory.end == 0) {
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+		if (!res) {
+			dev_err(&pdev->dev, "No memory resource\n");
+			return -EINVAL;
+		}
+	} else {
+		res = &params.memory;
 	}
 
 	mem = request_mem_region(res->start, resource_size(res), "simplefb");