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clk-bcm2835: Add claim-clocks property

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The claim-clocks property can be used to prevent PLLs and dividers
from being marked as critical. It contains a vector of clock IDs,
as defined by dt-bindings/clock/bcm2835.h.

Use this mechanism to claim PLLD_DSI0, PLLD_DSI1, PLLH_AUX and
PLLH_PIX for the vc4_kms_v3d driver.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
This commit is contained in:
Phil Elwell
2017-02-13 17:20:08 +00:00
committed by popcornmix
parent 5c083e5fbc
commit 204050d0ea
2 changed files with 46 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts
View File

@@ -5,6 +5,8 @@
/dts-v1/;
/plugin/;
#include <dt-bindings/clock/bcm2835.h>
/ {
compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
@@ -155,6 +157,18 @@
};
};
fragment@19 {
target = <&clocks>;
__overlay__ {
claim-clocks = <
BCM2835_PLLD_DSI0
BCM2835_PLLD_DSI1
BCM2835_PLLH_AUX
BCM2835_PLLH_PIX
>;
};
};
__overrides__ {
cma-256 = <0>,"+0-1-2-3-4";
cma-192 = <0>,"-0+1-2-3-4";

30
drivers/clk/bcm/clk-bcm2835.c
View File

@@ -1298,6 +1298,8 @@ static const struct clk_ops bcm2835_vpu_clock_clk_ops = {
.debug_init = bcm2835_clock_debug_init,
};
static bool bcm2835_clk_is_claimed(const char *name);
static struct clk_hw *bcm2835_register_pll(struct bcm2835_cprman *cprman,
const struct bcm2835_pll_data *data)
{
@@ -1314,6 +1316,9 @@ static struct clk_hw *bcm2835_register_pll(struct bcm2835_cprman *cprman,
init.ops = &bcm2835_pll_clk_ops;
init.flags = CLK_IGNORE_UNUSED;
if (!bcm2835_clk_is_claimed(data->name))
init.flags |= CLK_IS_CRITICAL;
pll = kzalloc(sizeof(*pll), GFP_KERNEL);
if (!pll)
return NULL;
@@ -1367,7 +1372,9 @@ bcm2835_register_pll_divider(struct bcm2835_cprman *cprman,
divider->div.table = NULL;
if (!(cprman_read(cprman, data->cm_reg) & data->hold_mask)) {
if (!bcm2835_clk_is_claimed(data->source_pll))
init.flags |= CLK_IS_CRITICAL;
if (!bcm2835_clk_is_claimed(data->name))
divider->div.flags |= CLK_IS_CRITICAL;
}
@@ -2104,6 +2111,8 @@ static const struct bcm2835_clk_desc clk_desc_array[] = {
.ctl_reg = CM_PERIICTL),
};
static bool bcm2835_clk_claimed[ARRAY_SIZE(clk_desc_array)];
/*
* Permanently take a reference on the parent of the SDRAM clock.
*
@@ -2123,6 +2132,19 @@ static int bcm2835_mark_sdc_parent_critical(struct clk *sdc)
return clk_prepare_enable(parent);
}
static bool bcm2835_clk_is_claimed(const char *name)
{
int i;
for (i = 0; i < ARRAY_SIZE(clk_desc_array); i++) {
const char *clk_name = *(const char **)(clk_desc_array[i].data);
if (!strcmp(name, clk_name))
return bcm2835_clk_claimed[i];
}
return false;
}
static int bcm2835_clk_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -2132,6 +2154,7 @@ static int bcm2835_clk_probe(struct platform_device *pdev)
const struct bcm2835_clk_desc *desc;
const size_t asize = ARRAY_SIZE(clk_desc_array);
size_t i;
u32 clk_id;
int ret;
cprman = devm_kzalloc(dev, sizeof(*cprman) +
@@ -2147,6 +2170,13 @@ static int bcm2835_clk_probe(struct platform_device *pdev)
if (IS_ERR(cprman->regs))
return PTR_ERR(cprman->regs);
memset(bcm2835_clk_claimed, 0, sizeof(bcm2835_clk_claimed));
for (i = 0;
!of_property_read_u32_index(pdev->dev.of_node, "claim-clocks",
i, &clk_id);
i++)
bcm2835_clk_claimed[clk_id]= true;
memcpy(cprman->real_parent_names, cprman_parent_names,
sizeof(cprman_parent_names));
of_clk_parent_fill(dev->of_node, cprman->real_parent_names,