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| author | Shawn Guo <shawn.guo@linaro.org> | 2021-12-15 08:23:22 +0800 |
|---|---|---|
| committer | Georgi Djakov <djakov@kernel.org> | 2021-12-15 07:12:56 +0200 |
| commit | e39bf2972c6e82eb7c51a78ca990d839aafeb124 (patch) | |
| tree | 5ca0783925b2aaa6c6dc3890f376a37d972df53a /drivers/interconnect/qcom/icc-rpm.c | |
| parent | 08c590409f303d61461b8fcaa9083438e4300448 (diff) | |
| download | linux-e39bf2972c6e82eb7c51a78ca990d839aafeb124.tar.gz linux-e39bf2972c6e82eb7c51a78ca990d839aafeb124.tar.bz2 linux-e39bf2972c6e82eb7c51a78ca990d839aafeb124.zip | |
interconnect: icc-rpm: Support child NoC device probe
As shown in downstream DT[1], the System NoC of QCM2290 is modelled
using 4 fab/noc devices: sys_noc + qup_virt + mmnrt_virt + mmrt_virt.
Among those 3 virtual devices, qup is owned by RPM and has no regmap
resource, while mmnrt and mmrt are owned by AP and share the same
regmap as sys_noc. So it's logical to represent these virtual devices
as child nodes of sys_noc in DT, so that such configuration can be
supported with a couple of changes on qnoc_probe():
- If there are child nodes, populate them.
- If the device descriptor has .regmap_cfg but there is no IOMEM
resource for the device, use parent's regmap.
[1] https://android.googlesource.com/kernel/msm-extra/devicetree/+/refs/tags/android-11.0.0_r0.56/qcom/scuba-bus.dtsi
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Link: https://lore.kernel.org/r/20211215002324.1727-4-shawn.guo@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>
Diffstat (limited to 'drivers/interconnect/qcom/icc-rpm.c')
| -rw-r--r-- | drivers/interconnect/qcom/icc-rpm.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/interconnect/qcom/icc-rpm.c b/drivers/interconnect/qcom/icc-rpm.c index d8ea9bb479b1..34125e8f8b60 100644 --- a/drivers/interconnect/qcom/icc-rpm.c +++ b/drivers/interconnect/qcom/icc-rpm.c @@ -349,8 +349,13 @@ int qnoc_probe(struct platform_device *pdev) void __iomem *mmio; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) + if (!res) { + /* Try parent's regmap */ + qp->regmap = dev_get_regmap(dev->parent, NULL); + if (qp->regmap) + goto regmap_done; return -ENODEV; + } mmio = devm_ioremap_resource(dev, res); @@ -366,6 +371,7 @@ int qnoc_probe(struct platform_device *pdev) } } +regmap_done: ret = devm_clk_bulk_get(dev, qp->num_clks, qp->bus_clks); if (ret) return ret; @@ -417,6 +423,10 @@ int qnoc_probe(struct platform_device *pdev) platform_set_drvdata(pdev, qp); + /* Populate child NoC devices if any */ + if (of_get_child_count(dev->of_node) > 0) + return of_platform_populate(dev->of_node, NULL, NULL, dev); + return 0; err: icc_nodes_remove(provider); |