[PATCH v2] ARM: ls1021a: add gating clocks to IP blocks.

From: Xiubo Li
Date: Mon Sep 22 2014 - 02:10:08 EST

A given application may not use all the peripherals on the device.
In this case, it may be desirable to disable unused peripherals.
DCFG provides a mechanism for gating clocks to IP blocks that are
not used when running an application.

Signed-off-by: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx>
---

Change in v2:
- Add binding support.


.../devicetree/bindings/clock/ls1021a-clock.txt | 27 +++++
arch/arm/mach-imx/Makefile | 2 +
arch/arm/mach-imx/clk-ls1021a.c | 124 +++++++++++++++++++++
arch/arm/mach-imx/clk.h | 21 ++++
include/dt-bindings/clock/ls1021a-clock.h | 54 +++++++++
5 files changed, 228 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/ls1021a-clock.txt
create mode 100644 arch/arm/mach-imx/clk-ls1021a.c
create mode 100644 include/dt-bindings/clock/ls1021a-clock.h

diff --git a/Documentation/devicetree/bindings/clock/ls1021a-clock.txt b/Documentation/devicetree/bindings/clock/ls1021a-clock.txt
new file mode 100644
index 0000000..e53d976
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/ls1021a-clock.txt
@@ -0,0 +1,27 @@
+Gating clock bindings for Freescale LS1021A SOC
+
+Required properties:
+- compatible: Should be "fsl,ls1021a-gate"
+- reg: Address and length of the register set
+- #clock-cells: Should be <1>
+
+The clock consumers should specify the desired clock by having one clock
+ID in its "clocks" phandle cell.
+Please see include/dt-bindings/clock/ls1021a-clock.h for the full list of
+LS1021A clock IDs.
+
+Example:
+
+gate: gate@1ee0000 {
+ compatible = "fsl,ls1021a-gate";
+ reg = <0x0 0x1ee0000 0x0 0x10000>;
+ #clock-cells = <1>;
+};
+
+wdog0: wdog@2ad0000 {
+ compatible = "fsl,ls1021a-wdt", "fsl,imx21-wdt";
+ reg = <0x0 0x2ad0000 0x0 0x10000>;
+ interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&gate LS1021A_CLK_WDOG12_EN>;
+ clock-names = "wdog12_en";
+};
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 6e4fcd8..f6a1544 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -110,4 +110,6 @@ obj-$(CONFIG_SOC_IMX53) += mach-imx53.o

obj-$(CONFIG_SOC_VF610) += clk-vf610.o mach-vf610.o

+obj-$(CONFIG_SOC_LS1021A) += clk-ls1021a.o
+
obj-y += devices/
diff --git a/arch/arm/mach-imx/clk-ls1021a.c b/arch/arm/mach-imx/clk-ls1021a.c
new file mode 100644
index 0000000..680b616
--- /dev/null
+++ b/arch/arm/mach-imx/clk-ls1021a.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_address.h>
+#include <dt-bindings/clock/ls1021a-clock.h>
+
+#include "clk.h"
+
+static struct clk *clk[LS1021A_CLK_END];
+static struct clk_onecell_data clk_data;
+
+static void __init ls1021a_clocks_init(struct device_node *np)
+{
+ void __iomem *dcfg_base;
+
+#define DCFG_CCSR_DEVDISR1 (dcfg_base + 0x70)
+#define DCFG_CCSR_DEVDISR2 (dcfg_base + 0x74)
+#define DCFG_CCSR_DEVDISR3 (dcfg_base + 0x78)
+#define DCFG_CCSR_DEVDISR4 (dcfg_base + 0x7c)
+#define DCFG_CCSR_DEVDISR5 (dcfg_base + 0x80)
+
+ dcfg_base = of_iomap(np, 0);
+
+ BUG_ON(!dcfg_base);
+
+ clk[LS1021A_CLK_PBL_EN] = ls1021a_clk_gate("pbl_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 0, true);
+ clk[LS1021A_CLK_ESDHC_EN] = ls1021a_clk_gate("esdhc_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 2, true);
+ clk[LS1021A_CLK_DMA1_EN] = ls1021a_clk_gate("dma1_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 8, true);
+ clk[LS1021A_CLK_DMA2_EN] = ls1021a_clk_gate("dma2_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 9, true);
+ clk[LS1021A_CLK_USB3_PHY_EN] = ls1021a_clk_gate("usb3_phy_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 12, true);
+ clk[LS1021A_CLK_USB2_EN] = ls1021a_clk_gate("usb2_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 13, true);
+ clk[LS1021A_CLK_SATA_EN] = ls1021a_clk_gate("sata_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 16, true);
+ clk[LS1021A_CLK_USB3_EN] = ls1021a_clk_gate("usb3_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 17, true);
+ clk[LS1021A_CLK_SEC_EN] = ls1021a_clk_gate("sec_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 22, true);
+ clk[LS1021A_CLK_2D_ACE_EN] = ls1021a_clk_gate("2d_ace_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 30, true);
+ clk[LS1021A_CLK_QE_EN] = ls1021a_clk_gate("qe_en", "dummy",
+ DCFG_CCSR_DEVDISR1, 31, true);
+
+ clk[LS1021A_CLK_ETSEC1_EN] = ls1021a_clk_gate("etsec1_en", "dummy",
+ DCFG_CCSR_DEVDISR2, 0, true);
+ clk[LS1021A_CLK_ETSEC2_EN] = ls1021a_clk_gate("etsec2_en", "dummy",
+ DCFG_CCSR_DEVDISR2, 1, true);
+ clk[LS1021A_CLK_ETSEC3_EN] = ls1021a_clk_gate("etsec3_en", "dummy",
+ DCFG_CCSR_DEVDISR2, 2, true);
+
+ clk[LS1021A_CLK_PEX1_EN] = ls1021a_clk_gate("pex1_en", "dummy",
+ DCFG_CCSR_DEVDISR3, 0, true);
+ clk[LS1021A_CLK_PEX2_EN] = ls1021a_clk_gate("pex2_en", "dummy",
+ DCFG_CCSR_DEVDISR3, 1, true);
+
+ clk[LS1021A_CLK_DUART1_EN] = ls1021a_clk_gate("duart1_en", "dummy",
+ DCFG_CCSR_DEVDISR4, 2, true);
+ clk[LS1021A_CLK_DUART2_EN] = ls1021a_clk_gate("duart2_en", "dummy",
+ DCFG_CCSR_DEVDISR4, 3, true);
+ clk[LS1021A_CLK_QSPI_EN] = ls1021a_clk_gate("qspi_en", "dummy",
+ DCFG_CCSR_DEVDISR4, 4, true);
+
+ clk[LS1021A_CLK_DDR_EN] = ls1021a_clk_gate("ddr_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 0, true);
+ clk[LS1021A_CLK_OCRAM1_EN] = ls1021a_clk_gate("ocram1_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 4, true);
+ clk[LS1021A_CLK_IFC_EN] = ls1021a_clk_gate("ifc_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 8, true);
+ clk[LS1021A_CLK_GPIO_EN] = ls1021a_clk_gate("gpio_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 9, true);
+ clk[LS1021A_CLK_DBG_EN] = ls1021a_clk_gate("dbg_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 10, true);
+ clk[LS1021A_CLK_FLEXCAN1_EN] = ls1021a_clk_gate("flexcan1_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 12, true);
+ clk[LS1021A_CLK_FLEXCAN234_EN] = ls1021a_clk_gate("flexcan234_en",
+ "dummy", DCFG_CCSR_DEVDISR5, 13, true);
+ /* For flextiemr 2/3/4/5/6/7/8 */
+ clk[LS1021A_CLK_FLEXTIMER_EN] = ls1021a_clk_gate("flextimer_en",
+ "dummy", DCFG_CCSR_DEVDISR5, 14, true);
+ clk[LS1021A_CLK_SECMON_EN] = ls1021a_clk_gate("secmon_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 17, true);
+ clk[LS1021A_CLK_WDOG12_EN] = ls1021a_clk_gate("wdog12_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 21, true);
+ clk[LS1021A_CLK_I2C23_EN] = ls1021a_clk_gate("i2c23_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 22, true);
+ /* For SAI 1/2/3/4 */
+ clk[LS1021A_CLK_SAI_EN] = ls1021a_clk_gate("sai_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 23, true);
+ /* For lpuart 2/3/4/5/6 */
+ clk[LS1021A_CLK_LPUART_EN] = ls1021a_clk_gate("lpuart_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 24, true);
+ clk[LS1021A_CLK_DSPI12_EN] = ls1021a_clk_gate("dspi12_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 25, true);
+ clk[LS1021A_CLK_ASRC_EN] = ls1021a_clk_gate("asrc_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 26, true);
+ clk[LS1021A_CLK_SPDIF_EN] = ls1021a_clk_gate("spdif_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 27, true);
+ clk[LS1021A_CLK_I2C1_EN] = ls1021a_clk_gate("i2c1_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 29, true);
+ clk[LS1021A_CLK_LPUART1_EN] = ls1021a_clk_gate("lpuart1_en", "dummy",
+ DCFG_CCSR_DEVDISR5, 30, true);
+ clk[LS1021A_CLK_FLEXTIMER1_EN] = ls1021a_clk_gate("flextimer1_en",
+ "dummy", DCFG_CCSR_DEVDISR5, 31, true);
+
+ /* Add the clocks to provider list */
+ 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(ls1021a, "fsl,ls1021a-gate", ls1021a_clocks_init);
diff --git a/arch/arm/mach-imx/clk.h b/arch/arm/mach-imx/clk.h
index 4cdf8b6..dd9e369 100644
--- a/arch/arm/mach-imx/clk.h
+++ b/arch/arm/mach-imx/clk.h
@@ -107,6 +107,27 @@ static inline struct clk *imx_clk_gate_dis(const char *name, const char *parent,
shift, CLK_GATE_SET_TO_DISABLE, &imx_ccm_lock);
}

+/* The DCFG registers are in big endian mode on LS1021A SoC */
+static inline u8 ls1021a_clk_calculate_shift(u8 shift)
+{
+ int m, n;
+
+ m = shift / 8;
+ n = shift % 8;
+
+ return (3 - m) * 8 + n;
+}
+
+static inline struct clk *ls1021a_clk_gate(const char *name, const char *parent,
+ void __iomem *reg, u8 shift, bool big_endian)
+{
+ if (big_endian)
+ shift = ls1021a_clk_calculate_shift(shift);
+
+ return clk_register_gate(NULL, name, parent, CLK_SET_RATE_PARENT, reg,
+ shift, CLK_GATE_SET_TO_DISABLE, &imx_ccm_lock);
+}
+
static inline struct clk *imx_clk_mux(const char *name, void __iomem *reg,
u8 shift, u8 width, const char **parents, int num_parents)
{
diff --git a/include/dt-bindings/clock/ls1021a-clock.h b/include/dt-bindings/clock/ls1021a-clock.h
new file mode 100644
index 0000000..f259882
--- /dev/null
+++ b/include/dt-bindings/clock/ls1021a-clock.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_LS1021A_H
+#define __DT_BINDINGS_CLOCK_LS1021A_H
+
+#define LS1021A_CLK_DUMMY 0
+#define LS1021A_CLK_PBL_EN 1
+#define LS1021A_CLK_ESDHC_EN 2
+#define LS1021A_CLK_DMA1_EN 3
+#define LS1021A_CLK_DMA2_EN 4
+#define LS1021A_CLK_USB3_PHY_EN 5
+#define LS1021A_CLK_USB2_EN 6
+#define LS1021A_CLK_SATA_EN 7
+#define LS1021A_CLK_USB3_EN 8
+#define LS1021A_CLK_SEC_EN 9
+#define LS1021A_CLK_2D_ACE_EN 10
+#define LS1021A_CLK_QE_EN 11
+#define LS1021A_CLK_ETSEC1_EN 12
+#define LS1021A_CLK_ETSEC2_EN 13
+#define LS1021A_CLK_ETSEC3_EN 14
+#define LS1021A_CLK_PEX1_EN 15
+#define LS1021A_CLK_PEX2_EN 16
+#define LS1021A_CLK_DUART1_EN 17
+#define LS1021A_CLK_DUART2_EN 18
+#define LS1021A_CLK_QSPI_EN 19
+#define LS1021A_CLK_DDR_EN 20
+#define LS1021A_CLK_OCRAM1_EN 21
+#define LS1021A_CLK_IFC_EN 22
+#define LS1021A_CLK_GPIO_EN 23
+#define LS1021A_CLK_DBG_EN 24
+#define LS1021A_CLK_FLEXCAN1_EN 25
+#define LS1021A_CLK_FLEXCAN234_EN 26
+#define LS1021A_CLK_FLEXTIMER_EN 27
+#define LS1021A_CLK_SECMON_EN 28
+#define LS1021A_CLK_WDOG12_EN 28
+#define LS1021A_CLK_I2C23_EN 30
+#define LS1021A_CLK_SAI_EN 31
+#define LS1021A_CLK_LPUART_EN 32
+#define LS1021A_CLK_DSPI12_EN 33
+#define LS1021A_CLK_ASRC_EN 34
+#define LS1021A_CLK_SPDIF_EN 35
+#define LS1021A_CLK_I2C1_EN 36
+#define LS1021A_CLK_LPUART1_EN 37
+#define LS1021A_CLK_FLEXTIMER1_EN 38
+#define LS1021A_CLK_END 39
+
+#endif /* __DT_BINDINGS_CLOCK_LS1021A_H */
--
2.1.0.27.g96db324

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