Re: [PATCH V2 2/4] clk: qcom: branch: Add mem ops support for branch2 clocks

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On 10/11/23 11:00, Imran Shaik wrote:
From: Taniya Das <quic_tdas@xxxxxxxxxxx>

Clock CBCRs with memories need an update for memory before enable/disable
of the clock, which helps retain the respective block's register contents.
Add support for the mem ops to handle this sequence.

Signed-off-by: Taniya Das <quic_tdas@xxxxxxxxxxx>
Signed-off-by: Imran Shaik <quic_imrashai@xxxxxxxxxxx>
---
  drivers/clk/qcom/clk-branch.c | 37 +++++++++++++++++++++++++++++++++++
  drivers/clk/qcom/clk-branch.h | 21 ++++++++++++++++++++
  2 files changed, 58 insertions(+)

diff --git a/drivers/clk/qcom/clk-branch.c b/drivers/clk/qcom/clk-branch.c
index fc4735f74f0f..9ac8d04b425a 100644
--- a/drivers/clk/qcom/clk-branch.c
+++ b/drivers/clk/qcom/clk-branch.c
@@ -1,6 +1,7 @@
  // SPDX-License-Identifier: GPL-2.0
  /*
   * Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023, Qualcomm Innovation Center, Inc. All rights reserved.
   */
#include <linux/kernel.h>
@@ -134,6 +135,42 @@ static void clk_branch2_disable(struct clk_hw *hw)
  	clk_branch_toggle(hw, false, clk_branch2_check_halt);
  }
+static int clk_branch2_mem_enable(struct clk_hw *hw)
+{
+	struct clk_mem_branch *mem_br = to_clk_mem_branch(hw);
+	const char *name = clk_hw_get_name(&mem_br->branch.clkr.hw);
+	u32 val;
+	int timeout = 200, ret;
Reverse-Christmas-tree, please

You can drop the timeout variable and pass the int literal.

+
+	regmap_update_bits(mem_br->branch.clkr.regmap, mem_br->mem_enable_reg,
+			mem_br->mem_enable_ack_bit, mem_br->mem_enable_ack_bit);
This is a mask, not a bit.

+
+	ret = regmap_read_poll_timeout(mem_br->branch.clkr.regmap, mem_br->mem_ack_reg,
+			val, val & mem_br->mem_enable_ack_bit, 0, timeout);

[...]

+/**
+ * struct clk_mem_branch - gating clock which are associated with memories
+ *
+ * @mem_enable_reg: branch clock memory gating register
+ * @mem_ack_reg: branch clock memory ack register
+ * @mem_enable_ack_bit: ANDed with @mem_ack_reg to check memory enablement
@dog: woofs

Describe what it is instead.

Konrad




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