linux-kernel - [RESEND PATCH v2 2/2] drivers: clk: zynqmp: Update fraction clock check from custom type flags

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Date:   Fri,  1 May 2020 16:43:30 -0700
From:   Amit Sunil Dhamne <amit.sunil.dhamne@...inx.com>
To:     mturquette@...libre.com, sboyd@...eaurora.org,
        michal.simek@...inx.com, mark.rutland@....com,
        linux-clk@...r.kernel.org
Cc:     rajanv@...inx.com, jollys@...inx.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Tejas Patel <tejas.patel@...inx.com>,
        Rajan Vaja <rajan.vaja@...inx.com>,
        Jolly Shah <jolly.shah@...inx.com>,
        Amit Sunil Dhamne <amit.sunil.dhamne@...inx.com>
Subject: [RESEND PATCH v2 2/2] drivers: clk: zynqmp: Update fraction clock check from custom type flags

From: Tejas Patel <tejas.patel@...inx.com>

Older firmware version sets BIT(13) in clkflag to mark a
divider as fractional divider. Updated firmware version sets BIT(4)
in type flags to mark a divider as fractional divider since
BIT(13) is defined as CLK_DUTY_CYCLE_PARENT in the common clk
framework flags.

To support both old and new firmware version, consider BIT(13) from
clkflag and BIT(4) from type_flag to check if divider is fractional
or not.

To maintain compatibility BIT(13) of clkflag in firmware will not be
used in future for any purpose and will be marked as unused.

Signed-off-by: Tejas Patel <tejas.patel@...inx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@...inx.com>
Signed-off-by: Jolly Shah <jolly.shah@...inx.com>
Signed-off-by: Amit Sunil Dhamne <amit.sunil.dhamne@...inx.com>
---
 drivers/clk/zynqmp/divider.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/zynqmp/divider.c b/drivers/clk/zynqmp/divider.c
index 4be2cc7..d43c9dd 100644
--- a/drivers/clk/zynqmp/divider.c
+++ b/drivers/clk/zynqmp/divider.c
@@ -25,7 +25,8 @@
 #define to_zynqmp_clk_divider(_hw)             \
        container_of(_hw, struct zynqmp_clk_divider, hw)

-#define CLK_FRAC       BIT(13) /* has a fractional parent */
+#define CLK_FRAC               BIT(13) /* has a fractional parent */
+#define CUSTOM_FLAG_CLK_FRAC   BIT(0) /* has a fractional parent in custom type flag */

 /**
  * struct zynqmp_clk_divider - adjustable divider clock
@@ -311,7 +312,8 @@ struct clk_hw *zynqmp_clk_register_divider(const char *name,
        init.num_parents = 1;

        /* struct clk_divider assignments */
-       div->is_frac = !!(nodes->flag & CLK_FRAC);
+       div->is_frac = !!((nodes->flag & CLK_FRAC) |
+                         (nodes->custom_type_flag & CUSTOM_FLAG_CLK_FRAC));
        div->flags = nodes->type_flag;
        div->hw.init = &init;
        div->clk_id = clk_id;
--
2.7.4

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