[PATCH 02/10] soc: amlogic: clk-measure: Support more measurement channels

[Chuan Liu via B4 Relay <devnull+chuan.liu.amlogic.com@kernel.org>]

From: Chuan Liu <chuan.liu@amlogic.com>

On S4 and C3, as well as later SoCs, the clk-measure IP expands the
number of supported measurement channels from 128 to 256. Accordingly,
the MSR_CLK_SRC field in the register is extended from 7 bits to 8 bits.

To support both the old and new implementations, the driver now
uniformly defines the valid MSR_CLK_SRC field as bits[27:20].

For SoCs where MSR_CLK_SRC is only 7 bits wide, the driver never sets
bit27, and on those SoCs bit27 is read-only. Therefore, using
bits[27:20] as the unified field definition does not introduce any
behavioral change or compatibility issue for existing SoCs.

Signed-off-by: Chuan Liu <chuan.liu@amlogic.com>
---
 drivers/soc/amlogic/meson-clk-measure.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/amlogic/meson-clk-measure.c b/drivers/soc/amlogic/meson-clk-measure.c
index 8a1a9fed0e74..0d4ba2555d17 100644
--- a/drivers/soc/amlogic/meson-clk-measure.c
+++ b/drivers/soc/amlogic/meson-clk-measure.c
@@ -20,7 +20,7 @@ static DEFINE_MUTEX(measure_lock);
 #define MSR_CONT		BIT(17) /* continuous measurement */
 #define MSR_INTR		BIT(18) /* interrupts */
 #define MSR_RUN			BIT(19)
-#define MSR_CLK_SRC		GENMASK(26, 20)
+#define MSR_CLK_SRC		GENMASK(27, 20)
 #define MSR_BUSY		BIT(31)
 
 #define MSR_VAL_MASK		GENMASK(15, 0)

-- 
2.42.0



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