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126 lines
3.9 KiB
Diff
126 lines
3.9 KiB
Diff
From b0fde8ea889e47505e4112d89da4be9469a37775 Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Thu, 14 Apr 2016 15:13:53 -0700
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Subject: [PATCH] clk: bcm2835: Do appropriate name lookups for DSI1's parents
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as well.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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.../bindings/clock/brcm,bcm2835-cprman.txt | 12 ++++-
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drivers/clk/bcm/clk-bcm2835.c | 54 +++++++++++++++++-----
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2 files changed, 54 insertions(+), 12 deletions(-)
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--- a/Documentation/devicetree/bindings/clock/brcm,bcm2835-cprman.txt
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+++ b/Documentation/devicetree/bindings/clock/brcm,bcm2835-cprman.txt
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@@ -16,7 +16,17 @@ Required properties:
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- #clock-cells: Should be <1>. The permitted clock-specifier values can be
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found in include/dt-bindings/clock/bcm2835.h
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- reg: Specifies base physical address and size of the registers
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-- clocks: The external oscillator clock phandle
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+- clocks: phandles to the parent clocks used as input to the module, in
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+ the following order:
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+
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+ - External oscillator
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+ - DSI1 byte clock
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+ - DSI1 DDR2 clock
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+ - DSI1 DDR clock
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+
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+ Only external oscillator is required. The DSI clocks may
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+ not be present, in which case their children will be
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+ unusable.
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Example:
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--- a/drivers/clk/bcm/clk-bcm2835.c
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+++ b/drivers/clk/bcm/clk-bcm2835.c
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@@ -297,11 +297,29 @@
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#define LOCK_TIMEOUT_NS 100000000
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#define BCM2835_MAX_FB_RATE 1750000000u
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+/*
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+ * Names of clocks used within the driver that need to be replaced
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+ * with an external parent's name. This array is in the order that
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+ * the clocks node in the DT references external clocks.
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+ */
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+static const char *cprman_parent_names[] = {
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+ "xosc",
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+ "dsi1_byte",
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+ "dsi1_ddr2",
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+ "dsi1_ddr",
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+};
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+
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struct bcm2835_cprman {
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struct device *dev;
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void __iomem *regs;
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spinlock_t regs_lock; /* spinlock for all clocks */
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- const char *osc_name;
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+
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+ /*
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+ * Real names of cprman clock parents looked up through
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+ * of_clk_get_parent_name(), which will be used in the
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+ * parent_names[] arrays for clock registration.
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+ */
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+ const char *real_parent_names[ARRAY_SIZE(cprman_parent_names)];
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struct clk_onecell_data onecell;
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struct clk *clks[];
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@@ -1168,7 +1186,7 @@ static struct clk *bcm2835_register_pll(
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memset(&init, 0, sizeof(init));
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/* All of the PLLs derive from the external oscillator. */
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- init.parent_names = &cprman->osc_name;
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+ init.parent_names = &cprman->real_parent_names[0];
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init.num_parents = 1;
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init.name = data->name;
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init.ops = &bcm2835_pll_clk_ops;
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@@ -1251,17 +1269,21 @@ static struct clk *bcm2835_register_cloc
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struct bcm2835_clock *clock;
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struct clk_init_data init;
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const char *parents[1 << CM_SRC_BITS];
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- size_t i;
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+ size_t i, j;
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/*
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- * Replace our "xosc" references with the oscillator's
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- * actual name.
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+ * Replace our strings referencing parent clocks with the
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+ * actual clock-output-name of the parent.
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*/
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for (i = 0; i < data->num_mux_parents; i++) {
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- if (strcmp(data->parents[i], "xosc") == 0)
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- parents[i] = cprman->osc_name;
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- else
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- parents[i] = data->parents[i];
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+ parents[i] = data->parents[i];
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+
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+ for (j = 0; j < ARRAY_SIZE(cprman_parent_names); j++) {
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+ if (strcmp(parents[i], cprman_parent_names[j]) == 0) {
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+ parents[i] = cprman->real_parent_names[j];
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+ break;
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+ }
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+ }
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}
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memset(&init, 0, sizeof(init));
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@@ -1883,8 +1905,18 @@ static int bcm2835_clk_probe(struct plat
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if (IS_ERR(cprman->regs))
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return PTR_ERR(cprman->regs);
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- cprman->osc_name = of_clk_get_parent_name(dev->of_node, 0);
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- if (!cprman->osc_name)
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+ for (i = 0; i < ARRAY_SIZE(cprman_parent_names); i++) {
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+ cprman->real_parent_names[i] =
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+ of_clk_get_parent_name(dev->of_node, i);
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+ }
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+ /*
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+ * Make sure the external oscillator has been registered.
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+ *
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+ * The other (DSI) clocks are not present on older device
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+ * trees, which we still need to support for backwards
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+ * compatibility.
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+ */
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+ if (!cprman->real_parent_names[0])
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return -ENODEV;
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platform_set_drvdata(pdev, cprman);
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