mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: ore@pengutronix.de, Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH master 2/3] clk: add BCM2835 auxiliary peripheral clock driver
Date: Fri, 22 Apr 2022 18:01:44 +0200	[thread overview]
Message-ID: <20220422160145.2354262-3-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20220422160145.2354262-1-a.fatoum@pengutronix.de>

Commit f6ce1103fdc4 ("ARM: rpi: move clk support to a separate driver")
replaced board code setting up clocks with clkdev_add_physbase() with a
proper cprman driver that registers fixed clocks and can be referenced
from device tree.

It was not fully equivalent though, because the mini UART's clock was no
longer registered as that is provided by a different clock controller.

Import the Linux v5.17 bcm2835-aux-clk driver to fix console usage on
Raspberry Pi 3b.

Fixes: f6ce1103fdc4 ("ARM: rpi: move clk support to a separate driver")
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/clk/Makefile              |  1 +
 drivers/clk/bcm/Makefile          |  2 +
 drivers/clk/bcm/clk-bcm2835-aux.c | 66 +++++++++++++++++++++++++++++++
 3 files changed, 69 insertions(+)
 create mode 100644 drivers/clk/bcm/Makefile
 create mode 100644 drivers/clk/bcm/clk-bcm2835-aux.c

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index ee503c1edb5f..baf452de9873 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -26,4 +26,5 @@ obj-$(CONFIG_CLK_SIFIVE)	+= sifive/
 obj-$(CONFIG_SOC_STARFIVE)	+= starfive/
 obj-$(CONFIG_COMMON_CLK_STM32F)		+= clk-stm32f4.o
 obj-$(CONFIG_MACH_RPI_COMMON)	+= clk-rpi.o
+obj-y				+= bcm/
 obj-$(CONFIG_COMMON_CLK_SCMI)	+= clk-scmi.o
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
new file mode 100644
index 000000000000..1539e9f592a8
--- /dev/null
+++ b/drivers/clk/bcm/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_ARCH_BCM283X)	+= clk-bcm2835-aux.o
diff --git a/drivers/clk/bcm/clk-bcm2835-aux.c b/drivers/clk/bcm/clk-bcm2835-aux.c
new file mode 100644
index 000000000000..385cfd5d3f06
--- /dev/null
+++ b/drivers/clk/bcm/clk-bcm2835-aux.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015 Broadcom
+ */
+
+#include <linux/clk.h>
+#include <io.h>
+#include <of_address.h>
+#include <driver.h>
+#include <init.h>
+#include <dt-bindings/clock/bcm2835-aux.h>
+
+#define BCM2835_AUXIRQ		0x00
+#define BCM2835_AUXENB		0x04
+
+static int bcm2835_aux_clk_probe(struct device_d *dev)
+{
+	struct clk_hw_onecell_data *onecell;
+	const char *parent;
+	struct clk *parent_clk;
+	void __iomem *reg, *gate;
+
+	parent_clk = clk_get(dev, NULL);
+	if (IS_ERR(parent_clk))
+		return PTR_ERR(parent_clk);
+	parent = __clk_get_name(parent_clk);
+
+	reg = of_iomap(dev->device_node, 0);
+	if (!reg)
+		return -ENOMEM;
+
+	onecell = kmalloc(struct_size(onecell, hws, BCM2835_AUX_CLOCK_COUNT),
+			  GFP_KERNEL);
+	if (!onecell)
+		return -ENOMEM;
+	onecell->num = BCM2835_AUX_CLOCK_COUNT;
+
+	gate = reg + BCM2835_AUXENB;
+	onecell->hws[BCM2835_AUX_CLOCK_UART] =
+		clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);
+
+	onecell->hws[BCM2835_AUX_CLOCK_SPI1] =
+		clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);
+
+	onecell->hws[BCM2835_AUX_CLOCK_SPI2] =
+		clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);
+
+	return of_clk_add_hw_provider(dev->device_node, of_clk_hw_onecell_get,
+				      onecell);
+}
+
+static const struct of_device_id bcm2835_aux_clk_of_match[] = {
+	{ .compatible = "brcm,bcm2835-aux", },
+	{},
+};
+
+static struct driver_d bcm2835_aux_clk_driver = {
+	.name = "bcm2835-aux-clk",
+	.of_compatible = bcm2835_aux_clk_of_match,
+	.probe          = bcm2835_aux_clk_probe,
+};
+core_platform_driver(bcm2835_aux_clk_driver);
+
+MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
+MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
+MODULE_LICENSE("GPL");
-- 
2.30.2


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox


  parent reply	other threads:[~2022-04-22 16:06 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-22 16:01 [PATCH master 0/3] ARM: rpi3: fix misc recent breakage Ahmad Fatoum
2022-04-22 16:01 ` [PATCH master 1/3] ARM: asm: fix miscompilation of 32-bit ENTRY_FUNCTION_WITHSTACK Ahmad Fatoum
2022-04-22 16:01 ` Ahmad Fatoum [this message]
2022-04-22 16:01 ` [PATCH master 3/3] clocksource: assign non-zero priorities to all clocksources Ahmad Fatoum

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20220422160145.2354262-3-a.fatoum@pengutronix.de \
    --to=a.fatoum@pengutronix.de \
    --cc=barebox@lists.infradead.org \
    --cc=ore@pengutronix.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox