Hi,
On Tuesday, January 23, 2018 08:34:56 PM Kunihiko Hayashi wrote:
> Enables 'memory-region' property referring to the memory description on
> the reserved-memory node in case of devicetree use.
> If there is no 'reg' property that specifies the address and size of
> the framebuffer, the address and size written in the memory description
> on the reserved-memory node can be used for the framebuffer.
>
> Furthermore, the reserved-memory node needs to have "no-map" attributes
> because simplefb driver maps the region by ioremap_wc().
>
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
This needs an ACK from Rob or Mark (DT bindings Maintainers).
> ---
> .../bindings/display/simple-framebuffer.txt | 3 ++
> drivers/video/fbdev/simplefb.c | 32 ++++++++++++++++++++++
> 2 files changed, 35 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/display/simple-framebuffer.txt b/Documentation/devicetree/bindings/display/simple-framebuffer.txt
> index 5a9ce51..be5139f 100644
> --- a/Documentation/devicetree/bindings/display/simple-framebuffer.txt
> +++ b/Documentation/devicetree/bindings/display/simple-framebuffer.txt
> @@ -56,6 +56,9 @@ Optional properties:
> framebuffer remains active.
>
> - display : phandle pointing to the primary display hardware node
> +- memory-region: phandle to a node describing memory region as framebuffer
> + memory instead of reg property. The node should include
> + 'no-map'.
>
> Example:
>
> diff --git a/drivers/video/fbdev/simplefb.c b/drivers/video/fbdev/simplefb.c
> index a3c44ec..aefc4b1 100644
> --- a/drivers/video/fbdev/simplefb.c
> +++ b/drivers/video/fbdev/simplefb.c
> @@ -29,6 +29,7 @@
> #include <linux/clk.h>
> #include <linux/clk-provider.h>
> #include <linux/of.h>
> +#include <linux/of_address.h>
> #include <linux/of_platform.h>
> #include <linux/parser.h>
> #include <linux/regulator/consumer.h>
> @@ -294,6 +295,35 @@ static void simplefb_clocks_enable(struct simplefb_par *par,
> static void simplefb_clocks_destroy(struct simplefb_par *par) { }
> #endif
>
> +#if defined CONFIG_OF
> +static struct resource *simplefb_parse_dt_reserved_mem(struct device *dev)
> +{
> + static struct resource res;
> + struct device_node *np;
> + int ret;
> +
> + np = of_parse_phandle(dev->of_node, "memory-region", 0);
> + if (!np)
> + return NULL;
> +
> + ret = of_address_to_resource(np, 0, &res);
> + if (ret < 0)
> + return NULL;
> +
> + if (!of_find_property(np, "no-map", NULL)) {
> + dev_err(dev, "Can't apply mapped reserved-memory\n");
> + return NULL;
> + }
> +
> + return &res;
> +}
> +#else
> +static struct resource *simplefb_parse_dt_reserved_mem(struct device *dev)
> +{
> + return NULL;
> +}
> +#endif
> +
> #if defined CONFIG_OF && defined CONFIG_REGULATOR
>
> #define SUPPLY_SUFFIX "-supply"
> @@ -428,6 +458,8 @@ static int simplefb_probe(struct platform_device *pdev)
> return ret;
>
> mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!mem)
> + mem = simplefb_parse_dt_reserved_mem(&pdev->dev);
> if (!mem) {
> dev_err(&pdev->dev, "No memory resource\n");
> return -EINVAL;
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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