linux-kernel - [RFC 1/5] clk: bcm2835: set CLK_GET_RATE

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Date:   Fri, 17 May 2019 17:35:03 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     stefan.wahren@...e.com, Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Eric Anholt <eric@...olt.net>
Cc:     mbrugger@...e.de, viresh.kumar@...aro.org, rjw@...ysocki.net,
        sboyd@...nel.org, ptesarik@...e.com,
        linux-rpi-kernel@...ts.infradead.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [RFC 1/5] clk: bcm2835: set CLK_GET_RATE_NOCACHE on CPU clocks

Raspberry Pi's firmware is responsible for updating the cpu clocks and
pll. This makes sure we get the right rates anytime.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
 drivers/clk/bcm/clk-bcm2835.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
index 770bb01f523e..c2772dfb155a 100644
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -411,6 +411,7 @@ struct bcm2835_pll_data {
 	u32 reference_enable_mask;
 	/* Bit in CM_LOCK to indicate when the PLL has locked. */
 	u32 lock_mask;
+	u32 flags;
 
 	const struct bcm2835_pll_ana_bits *ana;
 
@@ -1299,7 +1300,7 @@ static struct clk_hw *bcm2835_register_pll(struct bcm2835_cprman *cprman,
 	init.num_parents = 1;
 	init.name = data->name;
 	init.ops = &bcm2835_pll_clk_ops;
-	init.flags = CLK_IGNORE_UNUSED;
+	init.flags = data->flags | CLK_IGNORE_UNUSED;
 
 	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
 	if (!pll)
@@ -1660,6 +1661,7 @@ static const struct bcm2835_clk_desc clk_desc_array[] = {
 		.ana_reg_base = A2W_PLLB_ANA0,
 		.reference_enable_mask = A2W_XOSC_CTRL_PLLB_ENABLE,
 		.lock_mask = CM_LOCK_FLOCKB,
+		.flags = CLK_GET_RATE_NOCACHE,
 
 		.ana = &bcm2835_ana_default,
 
@@ -1674,7 +1676,7 @@ static const struct bcm2835_clk_desc clk_desc_array[] = {
 		.load_mask = CM_PLLB_LOADARM,
 		.hold_mask = CM_PLLB_HOLDARM,
 		.fixed_divider = 1,
-		.flags = CLK_SET_RATE_PARENT),
+		.flags = CLK_SET_RATE_PARENT | CLK_GET_RATE_NOCACHE),
 
 	/*
 	 * PLLC is the core PLL, used to drive the core VPU clock.
-- 
2.21.0