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103 lines
3.2 KiB
Diff
103 lines
3.2 KiB
Diff
6 years ago
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From 7a4c12de72b705c93482f3dd28b230ced588052f Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Mon, 13 Feb 2017 17:20:08 +0000
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Subject: [PATCH 027/454] clk-bcm2835: Add claim-clocks property
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The claim-clocks property can be used to prevent PLLs and dividers
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from being marked as critical. It contains a vector of clock IDs,
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as defined by dt-bindings/clock/bcm2835.h.
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Use this mechanism to claim PLLD_DSI0, PLLD_DSI1, PLLH_AUX and
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PLLH_PIX for the vc4_kms_v3d driver.
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/clk/bcm/clk-bcm2835.c | 34 ++++++++++++++++++++++++++++++++--
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1 file changed, 32 insertions(+), 2 deletions(-)
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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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@@ -1329,6 +1329,8 @@ static const struct clk_ops bcm2835_vpu_
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.debug_init = bcm2835_clock_debug_init,
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};
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+static bool bcm2835_clk_is_claimed(const char *name);
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+
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static struct clk_hw *bcm2835_register_pll(struct bcm2835_cprman *cprman,
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const struct bcm2835_pll_data *data)
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{
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@@ -1345,6 +1347,9 @@ static struct clk_hw *bcm2835_register_p
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init.ops = &bcm2835_pll_clk_ops;
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init.flags = CLK_IGNORE_UNUSED;
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+ if (!bcm2835_clk_is_claimed(data->name))
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+ init.flags |= CLK_IS_CRITICAL;
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+
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pll = kzalloc(sizeof(*pll), GFP_KERNEL);
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if (!pll)
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return NULL;
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@@ -1398,8 +1403,10 @@ bcm2835_register_pll_divider(struct bcm2
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divider->div.table = NULL;
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if (!(cprman_read(cprman, data->cm_reg) & data->hold_mask)) {
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- init.flags |= CLK_IS_CRITICAL;
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- divider->div.flags |= CLK_IS_CRITICAL;
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+ if (!bcm2835_clk_is_claimed(data->source_pll))
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+ init.flags |= CLK_IS_CRITICAL;
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+ if (!bcm2835_clk_is_claimed(data->name))
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+ divider->div.flags |= CLK_IS_CRITICAL;
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}
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divider->cprman = cprman;
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@@ -2152,6 +2159,8 @@ static const struct bcm2835_clk_desc clk
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.ctl_reg = CM_PERIICTL),
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};
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+static bool bcm2835_clk_claimed[ARRAY_SIZE(clk_desc_array)];
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+
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/*
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* Permanently take a reference on the parent of the SDRAM clock.
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*
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@@ -2171,6 +2180,19 @@ static int bcm2835_mark_sdc_parent_criti
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return clk_prepare_enable(parent);
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}
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+static bool bcm2835_clk_is_claimed(const char *name)
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+{
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+ int i;
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+
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+ for (i = 0; i < ARRAY_SIZE(clk_desc_array); i++) {
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+ const char *clk_name = *(const char **)(clk_desc_array[i].data);
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+ if (!strcmp(name, clk_name))
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+ return bcm2835_clk_claimed[i];
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+ }
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+
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+ return false;
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+}
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+
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static int bcm2835_clk_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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@@ -2180,6 +2202,7 @@ static int bcm2835_clk_probe(struct plat
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const struct bcm2835_clk_desc *desc;
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const size_t asize = ARRAY_SIZE(clk_desc_array);
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size_t i;
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+ u32 clk_id;
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int ret;
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cprman = devm_kzalloc(dev, sizeof(*cprman) +
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@@ -2195,6 +2218,13 @@ 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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+ memset(bcm2835_clk_claimed, 0, sizeof(bcm2835_clk_claimed));
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+ for (i = 0;
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+ !of_property_read_u32_index(pdev->dev.of_node, "claim-clocks",
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+ i, &clk_id);
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+ i++)
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+ bcm2835_clk_claimed[clk_id]= true;
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+
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memcpy(cprman->real_parent_names, cprman_parent_names,
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sizeof(cprman_parent_names));
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of_clk_parent_fill(dev->of_node, cprman->real_parent_names,
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