linux-kernel - [PATCH 1/3] clk: zynqmp: Use firmware specific common clock flags

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Message-Id: <1593477014-18443-2-git-send-email-amit.sunil.dhamne@xilinx.com>
Date:   Mon, 29 Jun 2020 17:30:12 -0700
From:   Amit Sunil Dhamne <amit.sunil.dhamne@...inx.com>
To:     mturquette@...libre.com, sboyd@...eaurora.org, sboyd@...nel.org,
        michal.simek@...inx.com, mark.rutland@....com,
        linux-clk@...r.kernel.org
Cc:     rajanv@...inx.com, jollys@...inx.com, tejasp@...inx.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rajan Vaja <rajan.vaja@...inx.com>,
        Amit Sunil Dhamne <amit.sunil.dhamne@...inx.com>
Subject: [PATCH 1/3] clk: zynqmp: Use firmware specific common clock flags

From: Rajan Vaja <rajan.vaja@...inx.com>

Currently firmware passes CCF specific flags to ZynqMP clock driver.
So firmware needs to be updated if CCF flags are changed. The firmware
should have its own 'flag number space' that is distinct from the
common clk framework's 'flag number space'. So define and use ZynqMP
specific common clock flags instead of using CCF flags.

Signed-off-by: Rajan Vaja <rajan.vaja@...inx.com>
Signed-off-by: Amit Sunil Dhamne <amit.sunil.dhamne@...inx.com>
---
 drivers/clk/zynqmp/clk-zynqmp.h | 22 ++++++++++++++++++++++
 drivers/clk/zynqmp/clkc.c       | 25 +++++++++++++++++++++++--
 2 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/zynqmp/clk-zynqmp.h b/drivers/clk/zynqmp/clk-zynqmp.h
index 5beeb41..d8e580b 100644
--- a/drivers/clk/zynqmp/clk-zynqmp.h
+++ b/drivers/clk/zynqmp/clk-zynqmp.h
@@ -10,6 +10,28 @@

 #include <linux/firmware/xlnx-zynqmp.h>

+/* Common Flags */
+/* must be gated across rate change */
+#define ZYNQMP_CLK_SET_RATE_GATE       BIT(0)
+/* must be gated across re-parent */
+#define ZYNQMP_CLK_SET_PARENT_GATE     BIT(1)
+/* propagate rate change up one level */
+#define ZYNQMP_CLK_SET_RATE_PARENT     BIT(2)
+/* do not gate even if unused */
+#define ZYNQMP_CLK_IGNORE_UNUSED       BIT(3)
+/* do not use the cached clk rate */
+#define ZYNQMP_CLK_GET_RATE_NOCACHE    BIT(6)
+/* don't re-parent on rate change */
+#define ZYNQMP_CLK_SET_RATE_NO_REPARENT        BIT(7)
+/* do not use the cached clk accuracy */
+#define ZYNQMP_CLK_GET_ACCURACY_NOCACHE        BIT(8)
+/* recalc rates after notifications */
+#define ZYNQMP_CLK_RECALC_NEW_RATES    BIT(9)
+/* clock needs to run to set rate */
+#define ZYNQMP_CLK_SET_RATE_UNGATE     BIT(10)
+/* do not gate, ever */
+#define ZYNQMP_CLK_IS_CRITICAL         BIT(11)
+
 enum topology_type {
        TYPE_INVALID,
        TYPE_MUX,
diff --git a/drivers/clk/zynqmp/clkc.c b/drivers/clk/zynqmp/clkc.c
index db8d0d7..8663587 100644
--- a/drivers/clk/zynqmp/clkc.c
+++ b/drivers/clk/zynqmp/clkc.c
@@ -385,14 +385,35 @@ static int __zynqmp_clock_get_topology(struct clock_topology *topology,
 {
        int i;
        u32 type;
+       u32 flag;

        for (i = 0; i < ARRAY_SIZE(response->topology); i++) {
                type = FIELD_GET(CLK_TOPOLOGY_TYPE, response->topology[i]);
                if (type == TYPE_INVALID)
                        return END_OF_TOPOLOGY_NODE;
                topology[*nnodes].type = type;
-               topology[*nnodes].flag = FIELD_GET(CLK_TOPOLOGY_FLAGS,
-                                                  response->topology[i]);
+               flag = FIELD_GET(CLK_TOPOLOGY_FLAGS, response->topology[i]);
+               topology[*nnodes].flag = 0;
+               topology[*nnodes].flag |= (flag & ZYNQMP_CLK_SET_RATE_GATE) ?
+                                          CLK_SET_RATE_GATE : 0;
+               topology[*nnodes].flag |= (flag & ZYNQMP_CLK_SET_RATE_PARENT) ?
+                                          CLK_SET_RATE_PARENT : 0;
+               topology[*nnodes].flag |= (flag & ZYNQMP_CLK_IGNORE_UNUSED) ?
+                                          CLK_IGNORE_UNUSED : 0;
+               topology[*nnodes].flag |= (flag & ZYNQMP_CLK_GET_RATE_NOCACHE) ?
+                                          CLK_GET_RATE_NOCACHE : 0;
+               topology[*nnodes].flag |= (flag &
+                                          ZYNQMP_CLK_SET_RATE_NO_REPARENT) ?
+                                          CLK_SET_RATE_NO_REPARENT : 0;
+               topology[*nnodes].flag |= (flag &
+                                          ZYNQMP_CLK_GET_ACCURACY_NOCACHE) ?
+                                          CLK_GET_ACCURACY_NOCACHE : 0;
+               topology[*nnodes].flag |= (flag & ZYNQMP_CLK_RECALC_NEW_RATES) ?
+                                          CLK_RECALC_NEW_RATES : 0;
+               topology[*nnodes].flag |= (flag & ZYNQMP_CLK_SET_RATE_UNGATE) ?
+                                          CLK_SET_RATE_UNGATE : 0;
+               topology[*nnodes].flag |= (flag & ZYNQMP_CLK_IS_CRITICAL) ?
+                                          CLK_IS_CRITICAL : 0;
                topology[*nnodes].type_flag =
                                FIELD_GET(CLK_TOPOLOGY_TYPE_FLAGS,
                                          response->topology[i]);
--
2.7.4

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