| Message ID | dd37f7a914509bf1c731dc6ffb457bb0e02ff694.1727963347.git.geert+renesas@glider.be (mailing list archive) |
|---|---|
| State | Under Review |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
| Series | Add Renesas R-Car Gen4 E-FUSE support | expand |
diff --git a/arch/arm64/boot/dts/renesas/r8a779f4.dtsi b/arch/arm64/boot/dts/renesas/r8a779f4.dtsi index ebed41892df3346c..dfa3c015e04b740c 100644 --- a/arch/arm64/boot/dts/renesas/r8a779f4.dtsi +++ b/arch/arm64/boot/dts/renesas/r8a779f4.dtsi @@ -10,3 +10,15 @@ / { compatible = "renesas,r8a779f4", "renesas,r8a779f0"; }; + +&fuse { + nvmem-layout { + compatible = "fixed-layout"; + #address-cells = <1>; + #size-cells = <1>; + + ufs_tune: calib@144 { + reg = <0x144 0x08>; + }; + }; +};
Describe the location in the E-FUSE block of the PLL and AFE tuning parameters for the Universal Flash Storage controller. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- v3: - New. After adding: &ufs { nvmem-cells = <&ufs_tune>; nvmem-cell-names = "calibration"; }; The calibration data can be retrieved using the following sample code: #include <linux/nvmem-consumer.h> static int nvmem_dump_cell(struct platform_device *pdev, const char *name) { struct device *dev = &pdev->dev; struct nvmem_cell *cell; int res = 0; void *data; size_t len; cell = nvmem_cell_get(dev, name); if (IS_ERR(cell)) return dev_err_probe(dev, PTR_ERR(cell), "Failed to get cell %s\n", name); data = nvmem_cell_read(cell, &len); if (IS_ERR(data)) { res = dev_err_probe(dev, PTR_ERR(data), "Failed to read cell %s\n", name); goto put; } pr_info("Cell %s contains %zu bytes of data\n", name, len); print_hex_dump(KERN_INFO, "| ", DUMP_PREFIX_NONE, 32, 1, data, len, 0); kfree(data); put: nvmem_cell_put(cell); return res; } Calling nvmem_dump_cell(pdev, "calibration") from ufs_renesas_probe() on the R-Car S4 Starter Kit development board gives: Cell calibration contains 8 bytes of data | 23 51 23 51 52 98 52 98 --- arch/arm64/boot/dts/renesas/r8a779f4.dtsi | 12 ++++++++++++ 1 file changed, 12 insertions(+)