[PATCH 4/4] clk: mxs: replace imx23 clk_register_clkdev with clock DT lookup
Shawn Guo
shawn.guo at linaro.org
Sun Aug 19 10:05:55 EDT 2012
It really becomes a maintenance issue that every time a device needs
to look up (clk_get) a clock we have to patch kernel clock file to call
clk_register_clkdev for that clock.
Since clock DT support which is meant to resolve clock lookup in device
tree is in place, the patch moves imx23 client devices' clock lookup
over to device tree, so that any new lookup to be added at later time
can just get done in DT instead of kernel.
Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
---
.../devicetree/bindings/clock/imx23-clock.txt | 77 ++++++++++++++++++++
arch/arm/boot/dts/imx23.dtsi | 60 +++++++++++++++-
drivers/clk/mxs/clk-imx23.c | 51 ++------------
3 files changed, 141 insertions(+), 47 deletions(-)
create mode 100644 Documentation/devicetree/bindings/clock/imx23-clock.txt
diff --git a/Documentation/devicetree/bindings/clock/imx23-clock.txt b/Documentation/devicetree/bindings/clock/imx23-clock.txt
new file mode 100644
index 0000000..d8e89b2
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/imx23-clock.txt
@@ -0,0 +1,77 @@
+* Clock bindings for Freescale i.MX23
+
+Required properties:
+- compatible: Should be "fsl,imx23-clkctrl"
+- reg: Address and length of the register set
+- #clock-cells: Should be <1>
+- clock-output-names: A list of clock output names that i.MX23 CLKCTRL
+ provides. The full list of all valid clock names and IDs is below.
+
+ Name ID
+ ------------------
+ ref_xtal 0
+ pll 1
+ ref_cpu 2
+ ref_emi 3
+ ref_pix 4
+ ref_io 5
+ saif_sel 6
+ lcdif_sel 7
+ gpmi_sel 8
+ ssp_sel 9
+ emi_sel 10
+ cpu 11
+ etm_sel 12
+ cpu_pll 13
+ cpu_xtal 14
+ hbus 15
+ xbus 16
+ lcdif_div 17
+ ssp_div 18
+ gpmi_div 19
+ emi_pll 20
+ emi_xtal 21
+ etm_div 22
+ saif_div 23
+ clk32k_div 24
+ rtc 25
+ adc 26
+ spdif_div 27
+ clk32k 28
+ dri 29
+ pwm 30
+ filt 31
+ uart 32
+ ssp 33
+ gpmi 34
+ spdif 35
+ emi 36
+ saif 37
+ lcdif 38
+ etm 39
+ usb 40
+ usb_pwr 41
+
+ The ID will be used by clock consumer in the first cell of "clocks"
+ phandle to specify the desired clock.
+
+Examples:
+
+clks: clkctrl at 80040000 {
+ compatible = "fsl,imx23-clkctrl";
+ reg = <0x80040000 0x2000>;
+ #clock-cells = <1>;
+ clock-output-names =
+ ...
+ "uart", /* 32 */
+ ...
+ "end_of_list";
+};
+
+auart0: serial at 8006c000 {
+ compatible = "fsl,imx23-auart";
+ reg = <0x8006c000 0x2000>;
+ interrupts = <24 25 23>;
+ clocks = <&clks 32>;
+ status = "disabled";
+};
diff --git a/arch/arm/boot/dts/imx23.dtsi b/arch/arm/boot/dts/imx23.dtsi
index 9700872..b7b2963 100644
--- a/arch/arm/boot/dts/imx23.dtsi
+++ b/arch/arm/boot/dts/imx23.dtsi
@@ -52,6 +52,7 @@
dma-apbh at 80004000 {
compatible = "fsl,imx23-dma-apbh";
reg = <0x80004000 0x2000>;
+ clocks = <&clks 15>;
};
ecc at 80008000 {
@@ -67,6 +68,7 @@
reg-names = "gpmi-nand", "bch";
interrupts = <13>, <56>;
interrupt-names = "gpmi-dma", "bch";
+ clocks = <&clks 34>;
fsl,gpmi-dma-channel = <4>;
status = "disabled";
};
@@ -74,6 +76,7 @@
ssp0: ssp at 80010000 {
reg = <0x80010000 0x2000>;
interrupts = <15 14>;
+ clocks = <&clks 33>;
fsl,ssp-dma-channel = <1>;
status = "disabled";
};
@@ -291,6 +294,7 @@
dma-apbx at 80024000 {
compatible = "fsl,imx23-dma-apbx";
reg = <0x80024000 0x2000>;
+ clocks = <&clks 16>;
};
dcp at 80028000 {
@@ -317,12 +321,14 @@
compatible = "fsl,imx23-lcdif";
reg = <0x80030000 2000>;
interrupts = <46 45>;
+ clocks = <&clks 38>;
status = "disabled";
};
ssp1: ssp at 80034000 {
reg = <0x80034000 0x2000>;
interrupts = <2 20>;
+ clocks = <&clks 33>;
fsl,ssp-dma-channel = <2>;
status = "disabled";
};
@@ -340,9 +346,54 @@
reg = <0x80040000 0x40000>;
ranges;
- clkctl at 80040000 {
+ clks: clkctrl at 80040000 {
+ compatible = "fsl,imx23-clkctrl";
reg = <0x80040000 0x2000>;
- status = "disabled";
+ #clock-cells = <1>;
+ clock-output-names =
+ "ref_xtal", /* 0 */
+ "pll", /* 1 */
+ "ref_cpu", /* 2 */
+ "ref_emi", /* 3 */
+ "ref_pix", /* 4 */
+ "ref_io", /* 5 */
+ "saif_sel", /* 6 */
+ "lcdif_sel", /* 7 */
+ "gpmi_sel", /* 8 */
+ "ssp_sel", /* 9 */
+ "emi_sel", /* 10 */
+ "cpu", /* 11 */
+ "etm_sel", /* 12 */
+ "cpu_pll", /* 13 */
+ "cpu_xtal", /* 14 */
+ "hbus", /* 15 */
+ "xbus", /* 16 */
+ "lcdif_div", /* 17 */
+ "ssp_div", /* 18 */
+ "gpmi_div", /* 19 */
+ "emi_pll", /* 20 */
+ "emi_xtal", /* 21 */
+ "etm_div", /* 22 */
+ "saif_div", /* 23 */
+ "clk32k_div", /* 24 */
+ "rtc", /* 25 */
+ "adc", /* 26 */
+ "spdif_div", /* 27 */
+ "clk32k", /* 28 */
+ "dri", /* 29 */
+ "pwm", /* 30 */
+ "filt", /* 31 */
+ "uart", /* 32 */
+ "ssp", /* 33 */
+ "gpmi", /* 34 */
+ "spdif", /* 35 */
+ "emi", /* 36 */
+ "saif", /* 37 */
+ "lcdif", /* 38 */
+ "etm", /* 39 */
+ "usb", /* 40 */
+ "usb_pwr", /* 41 */
+ "end_of_list";
};
saif0: saif at 80042000 {
@@ -394,6 +445,7 @@
pwm: pwm at 80064000 {
compatible = "fsl,imx23-pwm";
reg = <0x80064000 0x2000>;
+ clocks = <&clks 30>;
#pwm-cells = <2>;
fsl,pwm-number = <5>;
status = "disabled";
@@ -408,6 +460,7 @@
compatible = "fsl,imx23-auart";
reg = <0x8006c000 0x2000>;
interrupts = <24 25 23>;
+ clocks = <&clks 32>;
status = "disabled";
};
@@ -415,6 +468,7 @@
compatible = "fsl,imx23-auart";
reg = <0x8006e000 0x2000>;
interrupts = <59 60 58>;
+ clocks = <&clks 32>;
status = "disabled";
};
@@ -422,6 +476,8 @@
compatible = "arm,pl011", "arm,primecell";
reg = <0x80070000 0x2000>;
interrupts = <0>;
+ clocks = <&clks 32>, <&clks 16>;
+ clock-names = "uart", "apb_pclk";
status = "disabled";
};
diff --git a/drivers/clk/mxs/clk-imx23.c b/drivers/clk/mxs/clk-imx23.c
index 844043ad0..d1c7cdb 100644
--- a/drivers/clk/mxs/clk-imx23.c
+++ b/drivers/clk/mxs/clk-imx23.c
@@ -14,6 +14,7 @@
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
+#include <linux/of.h>
#include <mach/common.h>
#include <mach/mx23.h>
#include "clk.h"
@@ -71,44 +72,6 @@ static void __init clk_misc_init(void)
__mxs_setl(30 << BP_FRAC_IOFRAC, FRAC);
}
-static struct clk_lookup uart_lookups[] = {
- { .dev_id = "duart", },
- { .dev_id = "mxs-auart.0", },
- { .dev_id = "mxs-auart.1", },
- { .dev_id = "8006c000.serial", },
- { .dev_id = "8006e000.serial", },
- { .dev_id = "80070000.serial", },
-};
-
-static struct clk_lookup hbus_lookups[] = {
- { .dev_id = "imx23-dma-apbh", },
- { .dev_id = "80004000.dma-apbh", },
-};
-
-static struct clk_lookup xbus_lookups[] = {
- { .dev_id = "duart", .con_id = "apb_pclk"},
- { .dev_id = "80070000.serial", .con_id = "apb_pclk"},
- { .dev_id = "imx23-dma-apbx", },
- { .dev_id = "80024000.dma-apbx", },
-};
-
-static struct clk_lookup ssp_lookups[] = {
- { .dev_id = "imx23-mmc.0", },
- { .dev_id = "imx23-mmc.1", },
- { .dev_id = "80010000.ssp", },
- { .dev_id = "80034000.ssp", },
-};
-
-static struct clk_lookup lcdif_lookups[] = {
- { .dev_id = "imx23-fb", },
- { .dev_id = "80030000.lcdif", },
-};
-
-static struct clk_lookup gpmi_lookups[] = {
- { .dev_id = "imx23-gpmi-nand", },
- { .dev_id = "8000c000.gpmi-nand", },
-};
-
static const char *sel_pll[] __initconst = { "pll", "ref_xtal", };
static const char *sel_cpu[] __initconst = { "ref_cpu", "ref_xtal", };
static const char *sel_pix[] __initconst = { "ref_pix", "ref_xtal", };
@@ -134,6 +97,7 @@ static enum imx23_clk clks_init_on[] __initdata = {
int __init mx23_clocks_init(void)
{
+ struct device_node *np;
int i;
clk_misc_init();
@@ -188,14 +152,11 @@ int __init mx23_clocks_init(void)
return PTR_ERR(clks[i]);
}
+ np = of_find_compatible_node(NULL, NULL, "fsl,imx23-clkctrl");
+ if (np)
+ of_clk_add_provider(np, of_clk_src_onecell_get, NULL);
+
clk_register_clkdev(clks[clk32k], NULL, "timrot");
- clk_register_clkdev(clks[pwm], NULL, "80064000.pwm");
- clk_register_clkdevs(clks[hbus], hbus_lookups, ARRAY_SIZE(hbus_lookups));
- clk_register_clkdevs(clks[xbus], xbus_lookups, ARRAY_SIZE(xbus_lookups));
- clk_register_clkdevs(clks[uart], uart_lookups, ARRAY_SIZE(uart_lookups));
- clk_register_clkdevs(clks[ssp], ssp_lookups, ARRAY_SIZE(ssp_lookups));
- clk_register_clkdevs(clks[gpmi], gpmi_lookups, ARRAY_SIZE(gpmi_lookups));
- clk_register_clkdevs(clks[lcdif], lcdif_lookups, ARRAY_SIZE(lcdif_lookups));
for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
clk_prepare_enable(clks[clks_init_on[i]]);
--
1.7.5.4
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