[PATCH v2 3/3] ARM: i.MX1 clk: Add devicetree support
Alexander Shiyan
shc_work at mail.ru
Tue May 13 09:05:16 PDT 2014
This patch adds devicetree support CCM module for i.MX1 (MC9328MX1) CPUs.
Signed-off-by: Alexander Shiyan <shc_work at mail.ru>
---
.../devicetree/bindings/clock/imx1-clock.txt | 28 +++++
arch/arm/mach-imx/clk-imx1.c | 138 +++++++++++++--------
include/dt-bindings/clock/imx1-clock.h | 40 ++++++
3 files changed, 153 insertions(+), 53 deletions(-)
create mode 100644 Documentation/devicetree/bindings/clock/imx1-clock.txt
create mode 100644 include/dt-bindings/clock/imx1-clock.h
diff --git a/Documentation/devicetree/bindings/clock/imx1-clock.txt b/Documentation/devicetree/bindings/clock/imx1-clock.txt
new file mode 100644
index 0000000..bae9216
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/imx1-clock.txt
@@ -0,0 +1,28 @@
+* Clock bindings for Freescale i.MX1 CPUs
+
+Required properties:
+- compatible: Should be "fsl,imx1-ccm".
+- reg: Address and length of the register set.
+- interrupts: Should contain CCM interrupt.
+- #clock-cells: Should be <1>.
+
+The clock consumer should specify the desired clock by having the clock
+ID in its "clocks" phandle cell. See include/dt-bindings/clock/imx1-clock.h
+for the full list of i.MX1 clock IDs.
+
+Examples:
+ clks: ccm at 0021b000 {
+ #clock-cells = <1>;
+ compatible = "fsl,imx1-ccm";
+ reg = <0x0021b000 0x1000>;
+ interrupts = <59>;
+ };
+
+ pwm: pwm at 00208000 {
+ #pwm-cells = <2>;
+ compatible = "fsl,imx1-pwm";
+ reg = <0x00208000 0x1000>;
+ interrupts = <34>;
+ clocks = <&clks IMX1_CLK_DUMMY>, <&clks IMX1_CLK_PER1>;
+ clock-names = "ipg", "per";
+ };
diff --git a/arch/arm/mach-imx/clk-imx1.c b/arch/arm/mach-imx/clk-imx1.c
index 7f739be..0901490 100644
--- a/arch/arm/mach-imx/clk-imx1.c
+++ b/arch/arm/mach-imx/clk-imx1.c
@@ -20,7 +20,10 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
#include <linux/err.h>
+#include <linux/of.h>
+#include <dt-bindings/clock/imx1-clock.h>
#include "clk.h"
#include "common.h"
@@ -43,72 +46,101 @@ static const char *prem_sel_clks[] = { "clk32_premult", "clk16m", };
static const char *clko_sel_clks[] = { "per1", "hclk", "clk48m", "clk16m",
"prem", "fclk", };
-enum imx1_clks {
- dummy, clk32, clk16m_ext, clk16m, clk32_premult, prem, mpll, mpll_gate,
- spll, spll_gate, mcu, fclk, hclk, clk48m, per1, per2, per3, clko,
- uart3_gate, ssi2_gate, brom_gate, dma_gate, csi_gate, mma_gate,
- usbd_gate, clk_max
-};
-
-static struct clk *clk[clk_max];
+static struct clk *clk[IMX1_CLK_MAX];
+static struct clk_onecell_data clk_data;
int __init mx1_clocks_init(unsigned long fref)
{
int i;
- clk[dummy] = imx_clk_fixed("dummy", 0);
- clk[clk32] = imx_clk_fixed("clk32", fref);
- clk[clk16m_ext] = imx_clk_fixed("clk16m_ext", 16000000);
- clk[clk16m] = imx_clk_gate("clk16m", "clk16m_ext", CCM_CSCR, 17);
- clk[clk32_premult] = imx_clk_fixed_factor("clk32_premult", "clk32", 512, 1);
- clk[prem] = imx_clk_mux("prem", CCM_CSCR, 16, 1, prem_sel_clks,
- ARRAY_SIZE(prem_sel_clks));
- clk[mpll] = imx_clk_pllv1("mpll", "clk32_premult", CCM_MPCTL0);
- clk[mpll_gate] = imx_clk_gate("mpll_gate", "mpll", CCM_CSCR, 0);
- clk[spll] = imx_clk_pllv1("spll", "prem", CCM_SPCTL0);
- clk[spll_gate] = imx_clk_gate("spll_gate", "spll", CCM_CSCR, 1);
- clk[mcu] = imx_clk_divider("mcu", "clk32_premult", CCM_CSCR, 15, 1);
- clk[fclk] = imx_clk_divider("fclk", "mpll_gate", CCM_CSCR, 15, 1);
- clk[hclk] = imx_clk_divider("hclk", "spll_gate", CCM_CSCR, 10, 4);
- clk[clk48m] = imx_clk_divider("clk48m", "spll_gate", CCM_CSCR, 26, 3);
- clk[per1] = imx_clk_divider("per1", "spll_gate", CCM_PCDR, 0, 4);
- clk[per2] = imx_clk_divider("per2", "spll_gate", CCM_PCDR, 4, 4);
- clk[per3] = imx_clk_divider("per3", "spll_gate", CCM_PCDR, 16, 7);
- clk[clko] = imx_clk_mux("clko", CCM_CSCR, 29, 3, clko_sel_clks,
- ARRAY_SIZE(clko_sel_clks));
- clk[uart3_gate] = imx_clk_gate("uart3_gate", "hclk", SCM_GCCR, 6);
- clk[ssi2_gate] = imx_clk_gate("ssi2_gate", "hclk", SCM_GCCR, 5);
- clk[brom_gate] = imx_clk_gate("brom_gate", "hclk", SCM_GCCR, 4);
- clk[dma_gate] = imx_clk_gate("dma_gate", "hclk", SCM_GCCR, 3);
- clk[csi_gate] = imx_clk_gate("csi_gate", "hclk", SCM_GCCR, 2);
- clk[mma_gate] = imx_clk_gate("mma_gate", "hclk", SCM_GCCR, 1);
- clk[usbd_gate] = imx_clk_gate("usbd_gate", "clk48m", SCM_GCCR, 0);
+ clk[IMX1_CLK_DUMMY] =
+ imx_clk_fixed("dummy", 0);
+ clk[IMX1_CLK_CLK32] =
+ imx_obtain_fixed_clock("clk32", fref);
+ clk[IMX1_CLK_CLK16M_EXT] =
+ imx_clk_fixed("clk16m_ext", 16000000);
+ clk[IMX1_CLK_CLK16M] =
+ imx_clk_gate("clk16m", "clk16m_ext", CCM_CSCR, 17);
+ clk[IMX1_CLK_CLK32_PREMULT] =
+ imx_clk_fixed_factor("clk32_premult", "clk32", 512, 1);
+ clk[IMX1_CLK_PREM] =
+ imx_clk_mux("prem", CCM_CSCR, 16, 1, prem_sel_clks,
+ ARRAY_SIZE(prem_sel_clks));
+ clk[IMX1_CLK_MPLL] =
+ imx_clk_pllv1("mpll", "clk32_premult", CCM_MPCTL0);
+ clk[IMX1_CLK_MPLL_GATE] =
+ imx_clk_gate("mpll_gate", "mpll", CCM_CSCR, 0);
+ clk[IMX1_CLK_SPLL] =
+ imx_clk_pllv1("spll", "prem", CCM_SPCTL0);
+ clk[IMX1_CLK_SPLL_GATE] =
+ imx_clk_gate("spll_gate", "spll", CCM_CSCR, 1);
+ clk[IMX1_CLK_MCU] =
+ imx_clk_divider("mcu", "clk32_premult", CCM_CSCR, 15, 1);
+ clk[IMX1_CLK_FCLK] =
+ imx_clk_divider("fclk", "mpll_gate", CCM_CSCR, 15, 1);
+ clk[IMX1_CLK_HCLK] =
+ imx_clk_divider("hclk", "spll_gate", CCM_CSCR, 10, 4);
+ clk[IMX1_CLK_CLK48M] =
+ imx_clk_divider("clk48m", "spll_gate", CCM_CSCR, 26, 3);
+ clk[IMX1_CLK_PER1] =
+ imx_clk_divider("per1", "spll_gate", CCM_PCDR, 0, 4);
+ clk[IMX1_CLK_PER2] =
+ imx_clk_divider("per2", "spll_gate", CCM_PCDR, 4, 4);
+ clk[IMX1_CLK_PER3] =
+ imx_clk_divider("per3", "spll_gate", CCM_PCDR, 16, 7);
+ clk[IMX1_CLK_CLKO] =
+ imx_clk_mux("clko", CCM_CSCR, 29, 3, clko_sel_clks,
+ ARRAY_SIZE(clko_sel_clks));
+ clk[IMX1_CLK_UART3_GATE] =
+ imx_clk_gate("uart3_gate", "hclk", SCM_GCCR, 6);
+ clk[IMX1_CLK_SSI2_GATE] =
+ imx_clk_gate("ssi2_gate", "hclk", SCM_GCCR, 5);
+ clk[IMX1_CLK_BROM_GATE] =
+ imx_clk_gate("brom_gate", "hclk", SCM_GCCR, 4);
+ clk[IMX1_CLK_DMA_GATE] =
+ imx_clk_gate("dma_gate", "hclk", SCM_GCCR, 3);
+ clk[IMX1_CLK_CSI_GATE] =
+ imx_clk_gate("csi_gate", "hclk", SCM_GCCR, 2);
+ clk[IMX1_CLK_MMA_GATE] =
+ imx_clk_gate("mma_gate", "hclk", SCM_GCCR, 1);
+ clk[IMX1_CLK_USBD_GATE] =
+ imx_clk_gate("usbd_gate", "clk48m", SCM_GCCR, 0);
for (i = 0; i < ARRAY_SIZE(clk); i++)
if (IS_ERR(clk[i]))
pr_err("imx1 clk %d: register failed with %ld\n",
i, PTR_ERR(clk[i]));
- clk_register_clkdev(clk[dma_gate], "ahb", "imx1-dma");
- clk_register_clkdev(clk[hclk], "ipg", "imx1-dma");
- clk_register_clkdev(clk[per1], "per", "imx-gpt.0");
- clk_register_clkdev(clk[hclk], "ipg", "imx-gpt.0");
- clk_register_clkdev(clk[per1], "per", "imx1-uart.0");
- clk_register_clkdev(clk[hclk], "ipg", "imx1-uart.0");
- clk_register_clkdev(clk[per1], "per", "imx1-uart.1");
- clk_register_clkdev(clk[hclk], "ipg", "imx1-uart.1");
- clk_register_clkdev(clk[per1], "per", "imx1-uart.2");
- clk_register_clkdev(clk[uart3_gate], "ipg", "imx1-uart.2");
- clk_register_clkdev(clk[hclk], NULL, "imx1-i2c.0");
- clk_register_clkdev(clk[per2], "per", "imx1-cspi.0");
- clk_register_clkdev(clk[dummy], "ipg", "imx1-cspi.0");
- clk_register_clkdev(clk[per2], "per", "imx1-cspi.1");
- clk_register_clkdev(clk[dummy], "ipg", "imx1-cspi.1");
- clk_register_clkdev(clk[per2], "per", "imx1-fb.0");
- clk_register_clkdev(clk[dummy], "ipg", "imx1-fb.0");
- clk_register_clkdev(clk[dummy], "ahb", "imx1-fb.0");
+ clk_register_clkdev(clk[IMX1_CLK_DMA_GATE], "ahb", "imx1-dma");
+ clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx1-dma");
+ clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx-gpt.0");
+ clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx-gpt.0");
+ clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx1-uart.0");
+ clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx1-uart.0");
+ clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx1-uart.1");
+ clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx1-uart.1");
+ clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx1-uart.2");
+ clk_register_clkdev(clk[IMX1_CLK_UART3_GATE], "ipg", "imx1-uart.2");
+ clk_register_clkdev(clk[IMX1_CLK_HCLK], NULL, "imx1-i2c.0");
+ clk_register_clkdev(clk[IMX1_CLK_PER2], "per", "imx1-cspi.0");
+ clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ipg", "imx1-cspi.0");
+ clk_register_clkdev(clk[IMX1_CLK_PER2], "per", "imx1-cspi.1");
+ clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ipg", "imx1-cspi.1");
+ clk_register_clkdev(clk[IMX1_CLK_PER2], "per", "imx1-fb.0");
+ clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ipg", "imx1-fb.0");
+ clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ahb", "imx1-fb.0");
mxc_timer_init(MX1_IO_ADDRESS(MX1_TIM1_BASE_ADDR), MX1_TIM1_INT);
return 0;
}
+
+static void __init mx1_clocks_init_dt(struct device_node *np)
+{
+ mx1_clocks_init(32768);
+
+ clk_data.clks = clk;
+ clk_data.clk_num = ARRAY_SIZE(clk);
+ of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
+}
+CLK_OF_DECLARE(imx1_ccm, "fsl,imx1-ccm", mx1_clocks_init_dt);
diff --git a/include/dt-bindings/clock/imx1-clock.h b/include/dt-bindings/clock/imx1-clock.h
new file mode 100644
index 0000000..607bf01
--- /dev/null
+++ b/include/dt-bindings/clock/imx1-clock.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2014 Alexander Shiyan <shc_work at mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_IMX1_H
+#define __DT_BINDINGS_CLOCK_IMX1_H
+
+#define IMX1_CLK_DUMMY 0
+#define IMX1_CLK_CLK32 1
+#define IMX1_CLK_CLK16M_EXT 2
+#define IMX1_CLK_CLK16M 3
+#define IMX1_CLK_CLK32_PREMULT 4
+#define IMX1_CLK_PREM 5
+#define IMX1_CLK_MPLL 6
+#define IMX1_CLK_MPLL_GATE 7
+#define IMX1_CLK_SPLL 8
+#define IMX1_CLK_SPLL_GATE 9
+#define IMX1_CLK_MCU 10
+#define IMX1_CLK_FCLK 11
+#define IMX1_CLK_HCLK 12
+#define IMX1_CLK_CLK48M 13
+#define IMX1_CLK_PER1 14
+#define IMX1_CLK_PER2 15
+#define IMX1_CLK_PER3 16
+#define IMX1_CLK_CLKO 17
+#define IMX1_CLK_UART3_GATE 18
+#define IMX1_CLK_SSI2_GATE 19
+#define IMX1_CLK_BROM_GATE 20
+#define IMX1_CLK_DMA_GATE 21
+#define IMX1_CLK_CSI_GATE 22
+#define IMX1_CLK_MMA_GATE 23
+#define IMX1_CLK_USBD_GATE 24
+#define IMX1_CLK_MAX 25
+
+#endif
--
1.8.3.2
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