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spmi: spmi-pmic-arb-debug: add support for fuse enable bit

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Add support for detecting a fuse bit that enables instead of
disables SPMI PMIC arbiter debug bus hardware.

Change-Id: Ia5190c1cc53a8f65ea83294dafd0ddc8861293ba
Signed-off-by: David Collins <collinsd@codeaurora.org>
This commit is contained in:
David Collins 2020-11-19 13:38:59 -08:00 committed by David Collins
parent a3c59b8c16
commit 2b37abe396
1 changed files with 12 additions and 4 deletions
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16
drivers/spmi/spmi-pmic-arb-debug.c
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@ -1,5 +1,5 @@
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved. */
/* Copyright (c) 2012-2018, 2020, The Linux Foundation. All rights reserved. */
#include <linux/clk.h>
#include <linux/delay.h>
@ -248,13 +248,21 @@ static int spmi_pmic_arb_debug_probe(struct platform_device *pdev)
int rc;
u32 fuse_val, fuse_bit;
void __iomem *fuse_addr;
bool is_disable_fuse = true;
/* Check if the debug bus is disabled by a fuse. */
/* Check if the debug bus is enabled or disabled by a fuse. */
rc = of_property_read_u32(pdev->dev.of_node, "qcom,fuse-disable-bit",
&fuse_bit);
if (rc) {
is_disable_fuse = false;
rc = of_property_read_u32(pdev->dev.of_node,
"qcom,fuse-enable-bit",
&fuse_bit);
}
if (!rc) {
if (fuse_bit > 31) {
dev_err(&pdev->dev, "qcom,fuse-disable-bit supports values 0 to 31, but %u specified\n",
dev_err(&pdev->dev, "qcom,fuse-%s-bit supports values 0 to 31, but %u specified\n",
is_disable_fuse ? "disable" : "enable",
fuse_bit);
return -EINVAL;
}
@ -273,7 +281,7 @@ static int spmi_pmic_arb_debug_probe(struct platform_device *pdev)
fuse_val = readl_relaxed(fuse_addr);
iounmap(fuse_addr);
if (fuse_val & BIT(fuse_bit)) {
if (!!(fuse_val & BIT(fuse_bit)) == is_disable_fuse) {
dev_err(&pdev->dev, "SPMI PMIC arbiter debug bus disabled by fuse\n");
return -ENODEV;
}