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authorH. Peter Anvin <hpa@zytor.com>2010-04-29 16:53:17 -0700
committerH. Peter Anvin <hpa@zytor.com>2010-04-29 16:53:17 -0700
commitd9c5841e22231e4e49fd0a1004164e6fce59b7a6 (patch)
treee1f589c46b3ff79bbe7b1b2469f6362f94576da6 /arch/arm/mach-davinci/include
parentb701a47ba48b698976fb2fe05fb285b0edc1d26a (diff)
parent5967ed87ade85a421ef814296c3c7f182b08c225 (diff)
Merge branch 'x86/asm' into x86/atomic
Merge reason: Conflict between LOCK_PREFIX_HERE and relative alternatives pointers Resolved Conflicts: arch/x86/include/asm/alternative.h arch/x86/kernel/alternative.c Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/arm/mach-davinci/include')
-rw-r--r--arch/arm/mach-davinci/include/mach/cdce949.h19
-rw-r--r--arch/arm/mach-davinci/include/mach/common.h2
-rw-r--r--arch/arm/mach-davinci/include/mach/cpuidle.h1
-rw-r--r--arch/arm/mach-davinci/include/mach/da8xx.h26
-rw-r--r--arch/arm/mach-davinci/include/mach/debug-macro.S2
-rw-r--r--arch/arm/mach-davinci/include/mach/dm365.h11
-rw-r--r--arch/arm/mach-davinci/include/mach/dm644x.h2
-rw-r--r--arch/arm/mach-davinci/include/mach/dm646x.h4
-rw-r--r--arch/arm/mach-davinci/include/mach/edma.h2
-rw-r--r--arch/arm/mach-davinci/include/mach/emac.h36
-rw-r--r--arch/arm/mach-davinci/include/mach/hardware.h2
-rw-r--r--arch/arm/mach-davinci/include/mach/i2c.h4
-rw-r--r--arch/arm/mach-davinci/include/mach/keyscan.h1
-rw-r--r--arch/arm/mach-davinci/include/mach/memory.h5
-rw-r--r--arch/arm/mach-davinci/include/mach/mux.h3
-rw-r--r--arch/arm/mach-davinci/include/mach/pm.h54
-rw-r--r--arch/arm/mach-davinci/include/mach/psc.h15
-rw-r--r--arch/arm/mach-davinci/include/mach/spi.h44
-rw-r--r--arch/arm/mach-davinci/include/mach/timex.h7
19 files changed, 189 insertions, 51 deletions
diff --git a/arch/arm/mach-davinci/include/mach/cdce949.h b/arch/arm/mach-davinci/include/mach/cdce949.h
new file mode 100644
index 00000000000..c73331fae34
--- /dev/null
+++ b/arch/arm/mach-davinci/include/mach/cdce949.h
@@ -0,0 +1,19 @@
+/*
+ * TI CDCE949 off-chip clock synthesizer support
+ *
+ * 2009 (C) Texas Instruments, Inc. http://www.ti.com/
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+#ifndef _MACH_DAVINCI_CDCE949_H
+#define _MACH_DAVINCI_CDCE949_H
+
+#include <linux/clk.h>
+
+#include <mach/clock.h>
+
+int cdce_set_rate(struct clk *clk, unsigned long rate);
+
+#endif
diff --git a/arch/arm/mach-davinci/include/mach/common.h b/arch/arm/mach-davinci/include/mach/common.h
index 6ca2c9a0a48..50a955f05ef 100644
--- a/arch/arm/mach-davinci/include/mach/common.h
+++ b/arch/arm/mach-davinci/include/mach/common.h
@@ -43,7 +43,7 @@ struct davinci_soc_info {
void __iomem *jtag_id_base;
struct davinci_id *ids;
unsigned long ids_num;
- struct davinci_clk *cpu_clks;
+ struct clk_lookup *cpu_clks;
void __iomem **psc_bases;
unsigned long psc_bases_num;
void __iomem *pinmux_base;
diff --git a/arch/arm/mach-davinci/include/mach/cpuidle.h b/arch/arm/mach-davinci/include/mach/cpuidle.h
index cbfc6a9c81b..74f088b0edf 100644
--- a/arch/arm/mach-davinci/include/mach/cpuidle.h
+++ b/arch/arm/mach-davinci/include/mach/cpuidle.h
@@ -12,6 +12,7 @@
struct davinci_cpuidle_config {
u32 ddr2_pdown;
+ void __iomem *ddr2_ctlr_base;
};
#endif
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index 90704910d34..03acfd39042 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -3,7 +3,7 @@
*
* Author: Mark A. Greer <mgreer@mvista.com>
*
- * 2007, 2009 (c) MontaVista Software, Inc. This file is licensed under
+ * 2007, 2009-2010 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
@@ -13,15 +13,19 @@
#include <video/da8xx-fb.h>
+#include <linux/platform_device.h>
+#include <linux/davinci_emac.h>
+
#include <mach/serial.h>
#include <mach/edma.h>
#include <mach/i2c.h>
-#include <mach/emac.h>
#include <mach/asp.h>
#include <mach/mmc.h>
#include <mach/usb.h>
+#include <mach/pm.h>
-extern void __iomem *da8xx_syscfg_base;
+extern void __iomem *da8xx_syscfg0_base;
+extern void __iomem *da8xx_syscfg1_base;
/*
* The cp_intc interrupt controller for the da8xx isn't in the same
@@ -34,13 +38,17 @@ extern void __iomem *da8xx_syscfg_base;
#define DA8XX_CP_INTC_SIZE SZ_8K
#define DA8XX_CP_INTC_VIRT (IO_VIRT - DA8XX_CP_INTC_SIZE - SZ_4K)
-#define DA8XX_SYSCFG_BASE (IO_PHYS + 0x14000)
-#define DA8XX_SYSCFG_VIRT(x) (da8xx_syscfg_base + (x))
+#define DA8XX_SYSCFG0_BASE (IO_PHYS + 0x14000)
+#define DA8XX_SYSCFG0_VIRT(x) (da8xx_syscfg0_base + (x))
#define DA8XX_JTAG_ID_REG 0x18
#define DA8XX_CFGCHIP0_REG 0x17c
#define DA8XX_CFGCHIP2_REG 0x184
#define DA8XX_CFGCHIP3_REG 0x188
+#define DA8XX_SYSCFG1_BASE (IO_PHYS + 0x22C000)
+#define DA8XX_SYSCFG1_VIRT(x) (da8xx_syscfg1_base + (x))
+#define DA8XX_DEEPSLEEP_REG 0x8
+
#define DA8XX_PSC0_BASE 0x01c10000
#define DA8XX_PLL0_BASE 0x01c11000
#define DA8XX_TIMER64P0_BASE 0x01c20000
@@ -48,11 +56,13 @@ extern void __iomem *da8xx_syscfg_base;
#define DA8XX_GPIO_BASE 0x01e26000
#define DA8XX_PSC1_BASE 0x01e27000
#define DA8XX_LCD_CNTRL_BASE 0x01e13000
+#define DA8XX_PLL1_BASE 0x01e1a000
#define DA8XX_MMCSD0_BASE 0x01c40000
#define DA8XX_AEMIF_CS2_BASE 0x60000000
#define DA8XX_AEMIF_CS3_BASE 0x62000000
#define DA8XX_AEMIF_CTL_BASE 0x68000000
#define DA8XX_DDR2_CTL_BASE 0xb0000000
+#define DA8XX_ARM_RAM_BASE 0xffff0000
#define PINMUX0 0x00
#define PINMUX1 0x04
@@ -90,6 +100,8 @@ void __init da8xx_register_mcasp(int id, struct snd_platform_data *pdata);
int da8xx_register_rtc(void);
int da850_register_cpufreq(void);
int da8xx_register_cpuidle(void);
+void __iomem * __init da8xx_get_mem_ctlr(void);
+int da850_register_pm(struct platform_device *pdev);
extern struct platform_device da8xx_serial_device;
extern struct emac_platform_data da8xx_emac_pdata;
@@ -134,6 +146,10 @@ extern const short da850_mmcsd0_pins[];
extern const short da850_nand_pins[];
extern const short da850_nor_pins[];
+#ifdef CONFIG_DAVINCI_MUX
int da8xx_pinmux_setup(const short pins[]);
+#else
+static inline int da8xx_pinmux_setup(const short pins[]) { return 0; }
+#endif
#endif /* __ASM_ARCH_DAVINCI_DA8XX_H */
diff --git a/arch/arm/mach-davinci/include/mach/debug-macro.S b/arch/arm/mach-davinci/include/mach/debug-macro.S
index 17ab5236da6..3cd93a801d9 100644
--- a/arch/arm/mach-davinci/include/mach/debug-macro.S
+++ b/arch/arm/mach-davinci/include/mach/debug-macro.S
@@ -19,7 +19,7 @@
#include <linux/serial_reg.h>
#define UART_SHIFT 2
- .macro addruart, rx
+ .macro addruart, rx, tmp
mrc p15, 0, \rx, c1, c0
tst \rx, #1 @ MMU enabled?
moveq \rx, #0x01000000 @ physical base address
diff --git a/arch/arm/mach-davinci/include/mach/dm365.h b/arch/arm/mach-davinci/include/mach/dm365.h
index f1710a30e7b..3a37b5a6983 100644
--- a/arch/arm/mach-davinci/include/mach/dm365.h
+++ b/arch/arm/mach-davinci/include/mach/dm365.h
@@ -14,10 +14,11 @@
#define __ASM_ARCH_DM665_H
#include <linux/platform_device.h>
+#include <linux/davinci_emac.h>
#include <mach/hardware.h>
-#include <mach/emac.h>
#include <mach/asp.h>
#include <mach/keyscan.h>
+#include <media/davinci/vpfe_capture.h>
#define DM365_EMAC_BASE (0x01D07000)
#define DM365_EMAC_CNTRL_OFFSET (0x0000)
@@ -31,9 +32,17 @@
#define DM365_RTC_BASE (0x01C69000)
+#define DAVINCI_DM365_VC_BASE (0x01D0C000)
+#define DAVINCI_DMA_VC_TX 2
+#define DAVINCI_DMA_VC_RX 3
+
void __init dm365_init(void);
void __init dm365_init_asp(struct snd_platform_data *pdata);
+void __init dm365_init_vc(struct snd_platform_data *pdata);
void __init dm365_init_ks(struct davinci_ks_platform_data *pdata);
void __init dm365_init_rtc(void);
+void dm365_init_spi0(unsigned chipselect_mask,
+ struct spi_board_info *info, unsigned len);
+void dm365_set_vpfe_config(struct vpfe_config *cfg);
#endif /* __ASM_ARCH_DM365_H */
diff --git a/arch/arm/mach-davinci/include/mach/dm644x.h b/arch/arm/mach-davinci/include/mach/dm644x.h
index 44e8f0fae9e..1a8b09ccc3c 100644
--- a/arch/arm/mach-davinci/include/mach/dm644x.h
+++ b/arch/arm/mach-davinci/include/mach/dm644x.h
@@ -22,8 +22,8 @@
#ifndef __ASM_ARCH_DM644X_H
#define __ASM_ARCH_DM644X_H
+#include <linux/davinci_emac.h>
#include <mach/hardware.h>
-#include <mach/emac.h>
#include <mach/asp.h>
#include <media/davinci/vpfe_capture.h>
diff --git a/arch/arm/mach-davinci/include/mach/dm646x.h b/arch/arm/mach-davinci/include/mach/dm646x.h
index 8cec746ae9d..846da98b619 100644
--- a/arch/arm/mach-davinci/include/mach/dm646x.h
+++ b/arch/arm/mach-davinci/include/mach/dm646x.h
@@ -12,10 +12,11 @@
#define __ASM_ARCH_DM646X_H
#include <mach/hardware.h>
-#include <mach/emac.h>
#include <mach/asp.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
+#include <linux/clk.h>
+#include <linux/davinci_emac.h>
#define DM646X_EMAC_BASE (0x01C80000)
#define DM646X_EMAC_CNTRL_OFFSET (0x0000)
@@ -30,6 +31,7 @@ void __init dm646x_init(void);
void __init dm646x_init_ide(void);
void __init dm646x_init_mcasp0(struct snd_platform_data *pdata);
void __init dm646x_init_mcasp1(struct snd_platform_data *pdata);
+void __init dm646x_board_setup_refclk(struct clk *clk);
void dm646x_video_init(void);
diff --git a/arch/arm/mach-davinci/include/mach/edma.h b/arch/arm/mach-davinci/include/mach/edma.h
index eb8bfd7925e..ced3092af5b 100644
--- a/arch/arm/mach-davinci/include/mach/edma.h
+++ b/arch/arm/mach-davinci/include/mach/edma.h
@@ -280,8 +280,6 @@ struct edma_soc_info {
unsigned n_cc;
enum dma_event_q default_queue;
- /* list of channels with no even trigger; terminated by "-1" */
- const s8 *noevent;
const s8 (*queue_tc_mapping)[2];
const s8 (*queue_priority_mapping)[2];
};
diff --git a/arch/arm/mach-davinci/include/mach/emac.h b/arch/arm/mach-davinci/include/mach/emac.h
deleted file mode 100644
index beff4fb7c84..00000000000
--- a/arch/arm/mach-davinci/include/mach/emac.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * TI DaVinci EMAC platform support
- *
- * Author: Kevin Hilman, Deep Root Systems, LLC
- *
- * 2007 (c) Deep Root Systems, LLC. This file is licensed under
- * the terms of the GNU General Public License version 2. This program
- * is licensed "as is" without any warranty of any kind, whether express
- * or implied.
- */
-#ifndef _MACH_DAVINCI_EMAC_H
-#define _MACH_DAVINCI_EMAC_H
-
-#include <linux/if_ether.h>
-#include <linux/memory.h>
-
-struct emac_platform_data {
- char mac_addr[ETH_ALEN];
- u32 ctrl_reg_offset;
- u32 ctrl_mod_reg_offset;
- u32 ctrl_ram_offset;
- u32 mdio_reg_offset;
- u32 ctrl_ram_size;
- u32 phy_mask;
- u32 mdio_max_freq;
- u8 rmii_en;
- u8 version;
-};
-
-enum {
- EMAC_VERSION_1, /* DM644x */
- EMAC_VERSION_2, /* DM646x */
-};
-
-void davinci_get_mac_addr(struct memory_accessor *mem_acc, void *context);
-#endif
diff --git a/arch/arm/mach-davinci/include/mach/hardware.h b/arch/arm/mach-davinci/include/mach/hardware.h
index 41c89386e39..c45ba1f62a1 100644
--- a/arch/arm/mach-davinci/include/mach/hardware.h
+++ b/arch/arm/mach-davinci/include/mach/hardware.h
@@ -27,7 +27,7 @@
/*
* I/O mapping
*/
-#define IO_PHYS 0x01c00000
+#define IO_PHYS 0x01c00000UL
#define IO_OFFSET 0xfd000000 /* Virtual IO = 0xfec00000 */
#define IO_SIZE 0x00400000
#define IO_VIRT (IO_PHYS + IO_OFFSET)
diff --git a/arch/arm/mach-davinci/include/mach/i2c.h b/arch/arm/mach-davinci/include/mach/i2c.h
index c248e9b7e82..2312d197dfb 100644
--- a/arch/arm/mach-davinci/include/mach/i2c.h
+++ b/arch/arm/mach-davinci/include/mach/i2c.h
@@ -1,5 +1,5 @@
/*
- * DaVinci I2C controller platfrom_device info
+ * DaVinci I2C controller platform_device info
*
* Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com>
*
@@ -16,6 +16,8 @@
struct davinci_i2c_platform_data {
unsigned int bus_freq; /* standard bus frequency (kHz) */
unsigned int bus_delay; /* post-transaction delay (usec) */
+ unsigned int sda_pin; /* GPIO pin ID to use for SDA */
+ unsigned int scl_pin; /* GPIO pin ID to use for SCL */
};
/* for board setup code */
diff --git a/arch/arm/mach-davinci/include/mach/keyscan.h b/arch/arm/mach-davinci/include/mach/keyscan.h
index b4e21a2976d..7a560e05bda 100644
--- a/arch/arm/mach-davinci/include/mach/keyscan.h
+++ b/arch/arm/mach-davinci/include/mach/keyscan.h
@@ -29,6 +29,7 @@ enum davinci_matrix_types {
};
struct davinci_ks_platform_data {
+ int (*device_enable)(struct device *dev);
unsigned short *keymap;
u32 keymapsize;
u8 rep:1;
diff --git a/arch/arm/mach-davinci/include/mach/memory.h b/arch/arm/mach-davinci/include/mach/memory.h
index 80309aed534..a91edfb8bee 100644
--- a/arch/arm/mach-davinci/include/mach/memory.h
+++ b/arch/arm/mach-davinci/include/mach/memory.h
@@ -31,6 +31,11 @@
#define PHYS_OFFSET DAVINCI_DDR_BASE
#endif
+#define DDR2_SDRCR_OFFSET 0xc
+#define DDR2_SRPD_BIT BIT(23)
+#define DDR2_MCLKSTOPEN_BIT BIT(30)
+#define DDR2_LPMODEN_BIT BIT(31)
+
/*
* Increase size of DMA-consistent memory region
*/
diff --git a/arch/arm/mach-davinci/include/mach/mux.h b/arch/arm/mach-davinci/include/mach/mux.h
index b60c693985f..2a68c1d8a24 100644
--- a/arch/arm/mach-davinci/include/mach/mux.h
+++ b/arch/arm/mach-davinci/include/mach/mux.h
@@ -327,6 +327,8 @@ enum davinci_dm365_index {
/* EDMA event muxing */
DM365_EVT2_ASP_TX,
DM365_EVT3_ASP_RX,
+ DM365_EVT2_VC_TX,
+ DM365_EVT3_VC_RX,
DM365_EVT26_MMC0_RX,
};
@@ -899,6 +901,7 @@ enum davinci_da850_index {
DA850_GPIO2_15,
DA850_GPIO4_0,
DA850_GPIO4_1,
+ DA850_RTC_ALARM,
};
#ifdef CONFIG_DAVINCI_MUX
diff --git a/arch/arm/mach-davinci/include/mach/pm.h b/arch/arm/mach-davinci/include/mach/pm.h
new file mode 100644
index 00000000000..37b19bf35a8
--- /dev/null
+++ b/arch/arm/mach-davinci/include/mach/pm.h
@@ -0,0 +1,54 @@
+/*
+ * TI DaVinci platform support for power management.
+ *
+ * Copyright (C) 2009 Texas Instruments, Inc. http://www.ti.com/
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#ifndef _MACH_DAVINCI_PM_H
+#define _MACH_DAVINCI_PM_H
+
+/*
+ * Caution: Assembly code in sleep.S makes assumtion on the order
+ * of the members of this structure.
+ */
+struct davinci_pm_config {
+ void __iomem *ddr2_ctlr_base;
+ void __iomem *ddrpsc_reg_base;
+ int ddrpsc_num;
+ void __iomem *ddrpll_reg_base;
+ void __iomem *deepsleep_reg;
+ void __iomem *cpupll_reg_base;
+ /*
+ * Note on SLEEPCOUNT:
+ * The SLEEPCOUNT feature is mainly intended for cases in which
+ * the internal oscillator is used. The internal oscillator is
+ * fully disabled in deep sleep mode. When you exist deep sleep
+ * mode, the oscillator will be turned on and will generate very
+ * small oscillations which will not be detected by the deep sleep
+ * counter. Eventually those oscillations will grow to an amplitude
+ * large enough to start incrementing the deep sleep counter.
+ * In this case recommendation from hardware engineers is that the
+ * SLEEPCOUNT be set to 4096. This means that 4096 valid clock cycles
+ * must be detected before the clock is passed to the rest of the
+ * system.
+ * In the case that the internal oscillator is not used and the
+ * clock is generated externally, the SLEEPCOUNT value can be very
+ * small since the clock input is assumed to be stable before SoC
+ * is taken out of deepsleep mode. A value of 128 would be more than
+ * adequate.
+ */
+ int sleepcount;
+};
+
+extern unsigned int davinci_cpu_suspend_sz;
+extern void davinci_cpu_suspend(struct davinci_pm_config *);
+
+#endif
diff --git a/arch/arm/mach-davinci/include/mach/psc.h b/arch/arm/mach-davinci/include/mach/psc.h
index 171173c1dba..651f6d8158f 100644
--- a/arch/arm/mach-davinci/include/mach/psc.h
+++ b/arch/arm/mach-davinci/include/mach/psc.h
@@ -180,8 +180,23 @@
#define DA8XX_LPSC1_CR_P3_SS 26
#define DA8XX_LPSC1_L3_CBA_RAM 31
+/* PSC register offsets */
+#define EPCPR 0x070
+#define PTCMD 0x120
+#define PTSTAT 0x128
+#define PDSTAT 0x200
+#define PDCTL1 0x304
+#define MDSTAT 0x800
+#define MDCTL 0xA00
+
+#define MDSTAT_STATE_MASK 0x1f
+
+#ifndef __ASSEMBLER__
+
extern int davinci_psc_is_clk_active(unsigned int ctlr, unsigned int id);
extern void davinci_psc_config(unsigned int domain, unsigned int ctlr,
unsigned int id, char enable);
+#endif
+
#endif /* __ASM_ARCH_PSC_H */
diff --git a/arch/arm/mach-davinci/include/mach/spi.h b/arch/arm/mach-davinci/include/mach/spi.h
new file mode 100644
index 00000000000..910efbf099c
--- /dev/null
+++ b/arch/arm/mach-davinci/include/mach/spi.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2009 Texas Instruments.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __ARCH_ARM_DAVINCI_SPI_H
+#define __ARCH_ARM_DAVINCI_SPI_H
+
+enum {
+ SPI_VERSION_1, /* For DM355/DM365/DM6467 */
+ SPI_VERSION_2, /* For DA8xx */
+};
+
+struct davinci_spi_platform_data {
+ u8 version;
+ u8 num_chipselect;
+ u8 wdelay;
+ u8 odd_parity;
+ u8 parity_enable;
+ u8 wait_enable;
+ u8 timer_disable;
+ u8 clk_internal;
+ u8 cs_hold;
+ u8 intr_level;
+ u8 poll_mode;
+ u8 use_dma;
+ u8 c2tdelay;
+ u8 t2cdelay;
+};
+
+#endif /* __ARCH_ARM_DAVINCI_SPI_H */
diff --git a/arch/arm/mach-davinci/include/mach/timex.h b/arch/arm/mach-davinci/include/mach/timex.h
index 52827567841..9b885298f10 100644
--- a/arch/arm/mach-davinci/include/mach/timex.h
+++ b/arch/arm/mach-davinci/include/mach/timex.h
@@ -11,7 +11,12 @@
#ifndef __ASM_ARCH_TIMEX_H
#define __ASM_ARCH_TIMEX_H
-/* The source frequency for the timers is the 27MHz clock */
+/*
+ * Alert: Not all timers of the DaVinci family run at a frequency of 27MHz,
+ * but we should be fine as long as CLOCK_TICK_RATE or LATCH (see include/
+ * linux/jiffies.h) are not used directly in code. Currently none of the
+ * code relevant to DaVinci platform depends on these values directly.
+ */
#define CLOCK_TICK_RATE 27000000
#endif /* __ASM_ARCH_TIMEX_H__ */