linux-kernel - [PATCH 05/10] clk: mmp2: Stop pretending PLL outputs are constant

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Date:   Wed, 19 Feb 2020 08:33:48 +0100
From:   Lubomir Rintel <lkundrak@...sk>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Lubomir Rintel <lkundrak@...sk>
Subject: [PATCH 05/10] clk: mmp2: Stop pretending PLL outputs are constant

The hardcoded values for PLL1 and PLL2 are wrong. PLL1 is slightly off -- it
defaults to 797.33 MHz, not 800 MHz. PLL2 is disabled by default, but also
configurable.

Tested on a MMP2-based OLPC XO-1.75 laptop, with PLL1=797.33 and various
values of PLL2 set via set-pll2-520mhz, set-pll2-910mhz and
set-pll2-988mhz Open Firmware words.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
 drivers/clk/mmp/clk-of-mmp2.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/mmp/clk-of-mmp2.c b/drivers/clk/mmp/clk-of-mmp2.c
index ee086d9714160..251d8d0e78abb 100644
--- a/drivers/clk/mmp/clk-of-mmp2.c
+++ b/drivers/clk/mmp/clk-of-mmp2.c
@@ -3,6 +3,7 @@
  *
  * Copyright (C) 2012 Marvell
  * Chao Xie <xiechao.mail@...il.com>
+ * Copyright (C) 2020 Lubomir Rintel <lkundrak@...sk>
  *
  * This file is licensed under the terms of the GNU General Public
  * License version 2. This program is licensed "as is" without any
@@ -55,7 +56,11 @@
 #define APMU_CCIC1	0xf4
 #define APMU_USBHSIC0	0xf8
 #define APMU_USBHSIC1	0xfc
+
+#define MPMU_FCCR	0x8
+#define MPMU_POSR	0x10
 #define MPMU_UART_PLL	0x14
+#define MPMU_PLL2_CR	0x34
 
 struct mmp2_clk_unit {
 	struct mmp_clk_unit unit;
@@ -67,11 +72,14 @@ struct mmp2_clk_unit {
 static struct mmp_param_fixed_rate_clk fixed_rate_clks[] = {
 	{MMP2_CLK_CLK32, "clk32", NULL, 0, 32768},
 	{MMP2_CLK_VCTCXO, "vctcxo", NULL, 0, 26000000},
-	{MMP2_CLK_PLL1, "pll1", NULL, 0, 800000000},
-	{MMP2_CLK_PLL2, "pll2", NULL, 0, 960000000},
 	{MMP2_CLK_USB_PLL, "usb_pll", NULL, 0, 480000000},
 };
 
+static struct mmp_param_pll_clk pll_clks[] = {
+	{MMP2_CLK_PLL1,   "pll1",   797330000, MPMU_FCCR,          0x4000, MPMU_POSR,     0},
+	{MMP2_CLK_PLL2,   "pll2",           0, MPMU_PLL2_CR,       0x0300, MPMU_PLL2_CR, 10},
+};
+
 static struct mmp_param_fixed_factor_clk fixed_factor_clks[] = {
 	{MMP2_CLK_PLL1_2, "pll1_2", "pll1", 1, 2, 0},
 	{MMP2_CLK_PLL1_4, "pll1_4", "pll1_2", 1, 2, 0},
@@ -113,6 +121,10 @@ static void mmp2_pll_init(struct mmp2_clk_unit *pxa_unit)
 	mmp_register_fixed_rate_clks(unit, fixed_rate_clks,
 					ARRAY_SIZE(fixed_rate_clks));
 
+	mmp_register_pll_clks(unit, pll_clks,
+				pxa_unit->mpmu_base,
+				ARRAY_SIZE(pll_clks));
+
 	mmp_register_fixed_factor_clks(unit, fixed_factor_clks,
 					ARRAY_SIZE(fixed_factor_clks));
 
-- 
2.24.1