于 2018年6月25日 GMT+08:00 下午11:58:05, Maxime Ripard [off-list ref] 写到:

On Fri, Jun 22, 2018 at 08:45:36PM +0800, Icenowy Zheng wrote:

quoted

The "Display Engine 2.0" (usually called DE2) on the Allwinner A64

SoC

quoted

is different from the ones on other Allwinner SoCs. It requires a

SRAM

quoted

region to be claimed, otherwise all DE2 subblocks won't be

accessible.

quoted

Add a bus driver for the Allwinner A64 DE2 part which claims the SRAM
region when probing.

Signed-off-by: Icenowy Zheng <redacted>
---
No changes since v1.

 drivers/bus/Kconfig      | 10 ++++++++
 drivers/bus/Makefile     |  1 +
 drivers/bus/sun50i-de2.c | 49

++++++++++++++++++++++++++++++++++++++++

quoted

 3 files changed, 60 insertions(+)
 create mode 100644 drivers/bus/sun50i-de2.c

diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index d1c0b60e9326..1851112ccc29 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig

@@ -103,6 +103,16 @@ config SIMPLE_PM_BUS
 	  Controller (BSC, sometimes called "LBSC within Bus Bridge", or
 	  "External Bus Interface") as found on several Renesas ARM SoCs.
 
+config SUN50I_DE2_BUS
+	bool "Allwinner A64 DE2 Bus Driver"
+	  default ARM64
+	  depends on ARCH_SUNXI
+	  select SUNXI_SRAM
+	  help

The alignment here should be one tab.

quoted

+static int sun50i_de2_bus_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	int ret;
+
+	ret = sunxi_sram_claim(&pdev->dev);
+	if (ret) {
+		dev_err(&pdev->dev, "Error couldn't map SRAM to device\n");
+		return ret;
+	}
+
+	if (np)
+		of_platform_populate(np, NULL, NULL, &pdev->dev);

Why do you need to test np here?

Oh thanks. Currently it's only probeable via dt.

Maxime

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