spi: rb4xx: null pointer bug fix

This patch fixes a null pointer bug in the spi driver spi-rb4xx.c by moving the private data initialization to earlier in probe

---
 drivers/spi/spi-rb4xx.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

index 4c9620e0d18c..17e1a77dc132 100644
@@ -158,6 +158,11 @@ static int rb4xx_spi_probe(struct platform_device *pdev)
 	master->transfer_one = rb4xx_transfer_one;
 	master->set_cs = rb4xx_set_cs;
 
+	rbspi = spi_master_get_devdata(master);
+	rbspi->base = spi_base;
+	rbspi->clk = ahb_clk;
+	platform_set_drvdata(pdev, rbspi);
+
 	err = devm_spi_register_master(&pdev->dev, master);
 	if (err) {
 		dev_err(&pdev->dev, "failed to register SPI master\n");

@@ -168,11 +173,6 @@ static int rb4xx_spi_probe(struct platform_device *pdev)
 	if (err)
 		return err;
 
-	rbspi = spi_master_get_devdata(master);
-	rbspi->base = spi_base;
-	rbspi->clk = ahb_clk;
-	platform_set_drvdata(pdev, rbspi);
-
 	/* Enable SPI */
 	rb4xx_write(rbspi, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
 

2.25.1

This patch updates the spi driver spi-rb4xx.c to be device tree aware

---
 drivers/spi/spi-rb4xx.c | 9 +++++++++
 1 file changed, 9 insertions(+)

index 17e1a77dc132..8aa51beb4ff3 100644
@@ -14,6 +14,7 @@
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/spi/spi.h>
+#include <linux/of.h>
 
 #include <asm/mach-ath79/ar71xx_regs.h>
 

@@ -150,6 +151,7 @@ static int rb4xx_spi_probe(struct platform_device *pdev)
 	if (IS_ERR(ahb_clk))
 		return PTR_ERR(ahb_clk);
 
+	master->dev.of_node = pdev->dev.of_node;
 	master->bus_num = 0;
 	master->num_chipselect = 3;
 	master->mode_bits = SPI_TX_DUAL;

@@ -188,11 +190,18 @@ static int rb4xx_spi_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id rb4xx_spi_dt_match[] = {
+	{ .compatible = "mikrotik,rb4xx-spi" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, rb4xx_spi_dt_match);
+
 static struct platform_driver rb4xx_spi_drv = {
 	.probe = rb4xx_spi_probe,
 	.remove = rb4xx_spi_remove,
 	.driver = {
 		.name = "rb4xx-spi",
+		.of_match_table = of_match_ptr(rb4xx_spi_dt_match),
 	},
 };
 

2.25.1

This patch adds the correcsponding MikroTik vendor and device tree documentation

---
 .../bindings/spi/mikrotik,rb4xx-spi.yaml      | 36 +++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 ++
 2 files changed, 38 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/mikrotik,rb4xx-spi.yaml

new file mode 100644
index 000000000000..4ddb42a4ae05
@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/mikrotik,rb4xx-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MikroTik RB4xx series SPI master
+
+maintainers:
+  - Gabor Juhos <[email protected]>
+  - Bert Vermeulen <[email protected]>
+
+allOf:
+  - $ref: "spi-controller.yaml#"
+
+properties:
+  compatible:
+    const: mikrotik,rb4xx-spi
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    spi: spi@1f000000 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        compatible = "mikrotik,rb4xx-spi";
+        reg = <0x1f000000 0x10>;
+    };
+
+...
\ No newline at end of file

index d3891386d671..d3277fe6640b 100644
@@ -633,6 +633,8 @@ patternProperties:
     description: Microsoft Corporation
   "^mikroe,.*":
     description: MikroElektronika d.o.o.
+  "^mikrotik,.*":
+    description: MikroTik
   "^miniand,.*":
     description: Miniand Tech
   "^minix,.*":

2.25.1

Applied to

https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/3] spi: rb4xx: null pointer bug fix

      commit: 678e5e1e42d74f77a6e2e9feb6f95ed72a996251
[2/3] spi: rb4xx: update driver to be device tree aware
      commit: 9a436c62fbb4c57c6f0be01e4fc368ed5da6b730
[3/3] spi: rb4xx: add corresponding device tree documentation
      commit: 39690c8d1fa3cda70aaed9afc8cba3c0a8eb1f53

All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying to this mail.

Thanks,
Mark