Thread (17 messages) flat view 17 messages, 4 authors, 2021-05-05

Re: [PATCH v6 1/6] clk: sifive: Add pcie_aux clock in prci driver for PCIe driver

From: Leon Romanovsky <leon@kernel.org>
Date: 2021-05-04 12:24:31
Also in: linux-clk, linux-pci, linux-riscv, lkml

On Tue, May 04, 2021 at 06:59:35PM +0800, Greentime Hu wrote:
quoted hunk ↗ jump to hunk
We add pcie_aux clock in this patch so that pcie driver can use
clk_prepare_enable() and clk_disable_unprepare() to enable and disable
pcie_aux clock.

Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
---
 drivers/clk/sifive/fu740-prci.c               | 11 +++++
 drivers/clk/sifive/fu740-prci.h               |  2 +-
 drivers/clk/sifive/sifive-prci.c              | 41 +++++++++++++++++++
 drivers/clk/sifive/sifive-prci.h              |  9 ++++
 include/dt-bindings/clock/sifive-fu740-prci.h |  1 +
 5 files changed, 63 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/sifive/fu740-prci.c b/drivers/clk/sifive/fu740-prci.c
index 764d1097aa51..53f6e00a03b9 100644
--- a/drivers/clk/sifive/fu740-prci.c
+++ b/drivers/clk/sifive/fu740-prci.c
@@ -72,6 +72,12 @@ static const struct clk_ops sifive_fu740_prci_hfpclkplldiv_clk_ops = {
 	.recalc_rate = sifive_prci_hfpclkplldiv_recalc_rate,
<...>
+/* PCIE AUX clock APIs for enable, disable. */
+int sifive_prci_pcie_aux_clock_is_enabled(struct clk_hw *hw)
It should be bool
+{
+	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
+	struct __prci_data *pd = pc->pd;
+	u32 r;
+
+	r = __prci_readl(pd, PRCI_PCIE_AUX_OFFSET);
+
+	if (r & PRCI_PCIE_AUX_EN_MASK)
+		return 1;
+	else
+		return 0;
+}
and here simple "return r & PRCI_PCIE_AUX_EN_MASK;"
+
+int sifive_prci_pcie_aux_clock_enable(struct clk_hw *hw)
+{
+	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
+	struct __prci_data *pd = pc->pd;
+	u32 r __maybe_unused;
+
+	if (sifive_prci_pcie_aux_clock_is_enabled(hw))
+		return 0;
You actually call to this new function only once, put your
__prci_readl() here.

Thanks
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help