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This is based on the code for kernel 4.9, but a lot of 4.9 patches are backports from more recent kernel version and can be removed now. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
93 lines
2.9 KiB
Diff
93 lines
2.9 KiB
Diff
From 5f0bb9d0bc545ef53a83f7bd176fdc0736eed8e5 Mon Sep 17 00:00:00 2001
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From: Jens Kuske <jenskuske@gmail.com>
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Date: Tue, 27 Oct 2015 17:50:24 +0100
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Subject: [PATCH] reset: sunxi: Add Allwinner H3 bus resets
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The H3 bus resets have some holes between the registers, so we add
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an of_xlate() function to skip them according to the datasheet.
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Signed-off-by: Jens Kuske <jenskuske@gmail.com>
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---
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.../bindings/reset/allwinner,sunxi-clock-reset.txt | 1 +
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drivers/reset/reset-sunxi.c | 30 +++++++++++++++++++---
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2 files changed, 28 insertions(+), 3 deletions(-)
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--- a/Documentation/devicetree/bindings/reset/allwinner,sunxi-clock-reset.txt
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+++ b/Documentation/devicetree/bindings/reset/allwinner,sunxi-clock-reset.txt
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@@ -8,6 +8,7 @@ Required properties:
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- compatible: Should be one of the following:
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"allwinner,sun6i-a31-ahb1-reset"
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"allwinner,sun6i-a31-clock-reset"
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+ "allwinner,sun8i-h3-bus-reset"
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- reg: should be register base and length as documented in the
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datasheet
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- #reset-cells: 1, see below
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--- a/drivers/reset/reset-sunxi.c
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+++ b/drivers/reset/reset-sunxi.c
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@@ -77,7 +77,9 @@ static const struct reset_control_ops su
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.deassert = sunxi_reset_deassert,
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};
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-static int sunxi_reset_init(struct device_node *np)
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+static int sunxi_reset_init(struct device_node *np,
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+ int (*of_xlate)(struct reset_controller_dev *rcdev,
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+ const struct of_phandle_args *reset_spec))
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{
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struct sunxi_reset_data *data;
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struct resource res;
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@@ -110,6 +112,7 @@ static int sunxi_reset_init(struct devic
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data->rcdev.nr_resets = size * 8;
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data->rcdev.ops = &sunxi_reset_ops;
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data->rcdev.of_node = np;
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+ data->rcdev.of_xlate = of_xlate;
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return reset_controller_register(&data->rcdev);
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@@ -118,6 +121,21 @@ err_alloc:
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return ret;
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};
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+static int sun8i_h3_bus_reset_xlate(struct reset_controller_dev *rcdev,
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+ const struct of_phandle_args *reset_spec)
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+{
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+ unsigned int index = reset_spec->args[0];
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+
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+ if (index < 96)
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+ return index;
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+ else if (index < 128)
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+ return index + 32;
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+ else if (index < 160)
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+ return index + 64;
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+ else
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+ return -EINVAL;
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+}
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+
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/*
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* These are the reset controller we need to initialize early on in
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* our system, before we can even think of using a regular device
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@@ -125,15 +143,21 @@ err_alloc:
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*/
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static const struct of_device_id sunxi_early_reset_dt_ids[] __initconst = {
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{ .compatible = "allwinner,sun6i-a31-ahb1-reset", },
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+ { .compatible = "allwinner,sun8i-h3-bus-reset", .data = sun8i_h3_bus_reset_xlate, },
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{ /* sentinel */ },
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};
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void __init sun6i_reset_init(void)
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{
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struct device_node *np;
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-
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- for_each_matching_node(np, sunxi_early_reset_dt_ids)
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- sunxi_reset_init(np);
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+ const struct of_device_id *match;
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+ int (*of_xlate)(struct reset_controller_dev *rcdev,
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+ const struct of_phandle_args *reset_spec);
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+
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+ for_each_matching_node_and_match(np, sunxi_early_reset_dt_ids, &match) {
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+ of_xlate = match->data;
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+ sunxi_reset_init(np, of_xlate);
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+ }
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}
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/*
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