linux-kernel - [PATCH v2 5/5] clk: tegra: divider: Mark Memory Controller clock as read-only

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Date:   Sun, 14 Apr 2019 22:23:21 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Joseph Lo <josephl@...dia.com>
Cc:     linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/5] clk: tegra: divider: Mark Memory Controller clock as read-only

The Memory Controller (MC) clock rate can't be simply changed and nothing
in kernel need to change the rate, hence let's make the clock read-only.
This id also needed for the EMC driver because timing configuration may
require the MC clock diver to be disabled, that is handled by the EMC
clock / EMC driver integration and CLK framework shall not touch the
MC divider configuration on the EMC clock rate change.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/clk/tegra/clk-divider.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/tegra/clk-divider.c b/drivers/clk/tegra/clk-divider.c
index 205fe8ff63f0..2a1822a22740 100644
--- a/drivers/clk/tegra/clk-divider.c
+++ b/drivers/clk/tegra/clk-divider.c
@@ -175,6 +175,7 @@ struct clk *tegra_clk_register_mc(const char *name, const char *parent_name,
 				  void __iomem *reg, spinlock_t *lock)
 {
 	return clk_register_divider_table(NULL, name, parent_name,
-					  CLK_IS_CRITICAL, reg, 16, 1, 0,
+					  CLK_IS_CRITICAL,
+					  reg, 16, 1, CLK_DIVIDER_READ_ONLY,
 					  mc_div_table, lock);
 }
-- 
2.21.0