[PATCH V2 7/8] ARM: OMAP3+: use cpu0-cpufreq driver in device tree supported boot

Nishanth Menon
2013-03-19T17:53:09Z

With OMAP3+ and AM33xx supported SoC having defined CPU device tree
entries with operating-points defined, we can now use the SoC
generic cpufreq-cpu0 driver by registering appropriate device.

As part of this change, add dummy clock node to use cpufreq-cpu0.
This is an suggested solution till we have OMAP clock nodes in DT.
Once the DT conversion is complete, we can then do:
clocks = <&dpll_mpu_ck>; or the SoC specific equivalent.

Inspired by patch: https://patchwork.kernel.org/patch/2067841/
now made generic.

Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Jon Hunter <jon-hunter@ti.com>
Cc: "Beno√Æt Cousson" <b-cousson@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Keerthy <j-keerthy@ti.com>
Cc: linux-omap@vger.kernel.org
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: cpufreq@vger.kernel.org
Cc: linux-pm@vger.kernel.org

Signed-off-by: Nishanth Menon <nm@ti.com>
---
Changes in V2:
- no functional changes
V1: https://patchwork.kernel.org/patch/2273621/

arch/arm/mach-omap2/board-generic.c | 5 +++++
arch/arm/mach-omap2/cclock33xx_data.c | 2 +-
arch/arm/mach-omap2/cclock3xxx_data.c | 3 ++-
arch/arm/mach-omap2/cclock44xx_data.c | 3 ++-
4 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
index afa509a..5b147ef 100644
--- a/arch/arm/mach-omap2/board-generic.c
+++ b/arch/arm/mach-omap2/board-generic.c
@@ -49,6 +49,11 @@ static void __init omap_generic_init(void)
omap4_panda_display_init_of();
else if (of_machine_is_compatible("ti,omap4-sdp"))
omap_4430sdp_display_init_of();
+
+ if (IS_ENABLED(CONFIG_GENERIC_CPUFREQ_CPU0)) {
+ struct platform_device_info devinfo = { .name = "cpufreq-cpu0", };
+ platform_device_register_full(&devinfo);
+ }
}

#ifdef CONFIG_SOC_OMAP2420
diff --git a/arch/arm/mach-omap2/cclock33xx_data.c b/arch/arm/mach-omap2/cclock33xx_data.c
index 476b820..cf7e736 100644
--- a/arch/arm/mach-omap2/cclock33xx_data.c
+++ b/arch/arm/mach-omap2/cclock33xx_data.c
@@ -852,7 +852,7 @@ static struct omap_clk am33xx_clks[] = {
CLK(NULL, "dpll_core_m5_ck", &dpll_core_m5_ck, CK_AM33XX),
CLK(NULL, "dpll_core_m6_ck", &dpll_core_m6_ck, CK_AM33XX),
CLK(NULL, "dpll_mpu_ck", &dpll_mpu_ck, CK_AM33XX),
- CLK("cpu0", NULL, &dpll_mpu_ck, CK_AM33XX),
+ CLK("cpufreq-cpu0.0", NULL, &dpll_mpu_ck, CK_AM33XX),
CLK(NULL, "dpll_mpu_m2_ck", &dpll_mpu_m2_ck, CK_AM33XX),
CLK(NULL, "dpll_ddr_ck", &dpll_ddr_ck, CK_AM33XX),
CLK(NULL, "dpll_ddr_m2_ck", &dpll_ddr_m2_ck, CK_AM33XX),
diff --git a/arch/arm/mach-omap2/cclock3xxx_data.c b/arch/arm/mach-omap2/cclock3xxx_data.c
index 4579c3c..5a5b471 100644
--- a/arch/arm/mach-omap2/cclock3xxx_data.c
+++ b/arch/arm/mach-omap2/cclock3xxx_data.c
@@ -3501,7 +3501,8 @@ static struct omap_clk omap3xxx_clks[] = {
CLK(NULL, "uart4_ick", &uart4_ick_am35xx, CK_AM35XX),
CLK(NULL, "timer_32k_ck", &omap_32k_fck, CK_3XXX),
CLK(NULL, "timer_sys_ck", &sys_ck, CK_3XXX),
- CLK(NULL, "cpufreq_ck", &dpll1_ck, CK_3XXX),
+ CLK(NULL, "cpufreq_ck", &dpll1_ck, CK_3XXX), /* used in non-device tree boot */
+ CLK("cpufreq-cpu0.0", NULL, &dpll1_ck, CK_3XXX), /* used in device tree boot */
};

static const char *enable_init_clks[] = {
diff --git a/arch/arm/mach-omap2/cclock44xx_data.c b/arch/arm/mach-omap2/cclock44xx_data.c
index 3d58f33..bcea785 100644
--- a/arch/arm/mach-omap2/cclock44xx_data.c
+++ b/arch/arm/mach-omap2/cclock44xx_data.c
@@ -1660,7 +1660,8 @@ static struct omap_clk omap44xx_clks[] = {
CLK("4013a000.timer", "timer_sys_ck", &syc_clk_div_ck, CK_443X),
CLK("4013c000.timer", "timer_sys_ck", &syc_clk_div_ck, CK_443X),
CLK("4013e000.timer", "timer_sys_ck", &syc_clk_div_ck, CK_443X),
- CLK(NULL, "cpufreq_ck", &dpll_mpu_ck, CK_443X),
+ CLK(NULL, "cpufreq_ck", &dpll_mpu_ck, CK_443X), /* used in non-device tree boot */
+ CLK("cpufreq-cpu0.0", NULL, &dpll_mpu_ck, CK_443X), /* used in device tree boot */
};

int __init omap4xxx_clk_init(void)
--
1.7.9.5

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