From: Stephen Warren swarren@nvidia.com
The only place where the MASK_BITS_* values are used is in adjust_periph_pll(), which interprets the value 4 (old MASK_BITS_29_28, new MASK_BITS_31_28) as being associated with mask OUT_CLK_SOURCE4_MASK, i.e. bits 31:28. Rename the MASK_BITS_ macro to reflect how it's actually implemented.
Note that no Tegra clock register actually uses all of bits 31:28 as the mux field. Rather, bits 30:28, 29:28, or 28 are used. However, in those cases, nothing is stored in the bits above the mux field, so it's safe to pretend that the mux field extends all the way to the end of the register. As such, the U-Boot clock driver is currently a bit lazy, and doesn't distinguish between 31:28, 30:28, 29:28 and 28; it just lumps them all together and pretends they're all 31:28. This patch doesn't cause this issue; it was pre-existing. Hopefully, future patches will clean this up.
Signed-off-by: Stephen Warren swarren@nvidia.com Reviewed-by: Thierry Reding treding@nvidia.com Tested-by: Thierry Reding treding@nvidia.com Acked-by: Thierry Reding treding@nvidia.com --- v2: Fixed typo in comment & patch description --- arch/arm/cpu/tegra114-common/clock.c | 2 +- arch/arm/cpu/tegra30-common/clock.c | 2 +- arch/arm/include/asm/arch-tegra/clock.h | 11 ++++++++++- 3 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/arch/arm/cpu/tegra114-common/clock.c b/arch/arm/cpu/tegra114-common/clock.c index 47612e12d262..3bede71a7a1f 100644 --- a/arch/arm/cpu/tegra114-common/clock.c +++ b/arch/arm/cpu/tegra114-common/clock.c @@ -103,7 +103,7 @@ static enum clock_id clock_source[CLOCK_TYPE_COUNT][CLOCK_MAX_MUX+1] = { MASK_BITS_31_29}, { CLK(PERIPH), CLK(CGENERAL), CLK(SFROM32KHZ), CLK(OSC), CLK(NONE), CLK(NONE), CLK(NONE), CLK(NONE), - MASK_BITS_29_28} + MASK_BITS_31_28} };
/* diff --git a/arch/arm/cpu/tegra30-common/clock.c b/arch/arm/cpu/tegra30-common/clock.c index 89c3529c885b..33528702185e 100644 --- a/arch/arm/cpu/tegra30-common/clock.c +++ b/arch/arm/cpu/tegra30-common/clock.c @@ -102,7 +102,7 @@ static enum clock_id clock_source[CLOCK_TYPE_COUNT][CLOCK_MAX_MUX+1] = { MASK_BITS_31_29}, { CLK(PERIPH), CLK(CGENERAL), CLK(SFROM32KHZ), CLK(OSC), CLK(NONE), CLK(NONE), CLK(NONE), CLK(NONE), - MASK_BITS_29_28} + MASK_BITS_31_28} };
/* diff --git a/arch/arm/include/asm/arch-tegra/clock.h b/arch/arm/include/asm/arch-tegra/clock.h index 052c0208b18a..80825e30f8e3 100644 --- a/arch/arm/include/asm/arch-tegra/clock.h +++ b/arch/arm/include/asm/arch-tegra/clock.h @@ -20,10 +20,19 @@ enum clock_osc_freq { CLOCK_OSC_FREQ_COUNT, };
+/* + * Note that no Tegra clock register actually uses all of bits 31:28 as + * the mux field. Rather, bits 30:28, 29:28, or 28 are used. However, in + * those cases, nothing is stored in the bits about the mux field, so it's + * safe to pretend that the mux field extends all the way to the end of the + * register. As such, the U-Boot clock driver is currently a bit lazy, and + * doesn't distinguish between 31:28, 30:28, 29:28 and 28; it just lumps + * them all together and pretends they're all 31:28. + */ enum { MASK_BITS_31_30 = 2, /* num of bits used to specify clock source */ MASK_BITS_31_29, - MASK_BITS_29_28, + MASK_BITS_31_28, };
#include <asm/arch/clock-tables.h>