linux-kernel - [PATCH 4/9] spi: meson-spicc: support max 80MHz clock

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Date:   Thu, 12 Mar 2020 14:31:26 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     broonie@...nel.org
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-spi@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sunny Luo <sunny.luo@...ogic.com>,
        Yixun Lan <yixun.lan@...ogic.com>
Subject: [PATCH 4/9] spi: meson-spicc: support max 80MHz clock

The SPICC controller in Meson-AXG is capable of running at 80M clock.
The ASIC IP is improved and the clock is actually running higher than
previous old SoCs.

Signed-off-by: Sunny Luo <sunny.luo@...ogic.com>
Signed-off-by: Yixun Lan <yixun.lan@...ogic.com>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/spi/spi-meson-spicc.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-meson-spicc.c b/drivers/spi/spi-meson-spicc.c
index bd434d9055d9..710b4e780daa 100644
--- a/drivers/spi/spi-meson-spicc.c
+++ b/drivers/spi/spi-meson-spicc.c
@@ -35,7 +35,6 @@
  *   to have a CS go down over the full transfer
  */
 
-#define SPICC_MAX_FREQ	30000000
 #define SPICC_MAX_BURST	128
 
 /* Register Map */
@@ -132,6 +131,7 @@
 #define SPICC_FIFO_HALF 10
 
 struct meson_spicc_data {
+	unsigned int			max_speed_hz;
 	bool				has_oen;
 	bool				has_enhance_clk_div;
 };
@@ -693,11 +693,9 @@ static int meson_spicc_probe(struct platform_device *pdev)
 	master->transfer_one = meson_spicc_transfer_one;
 	master->use_gpio_descriptors = true;
 
-	/* Setup max rate according to the Meson GX datasheet */
-	if ((rate >> 2) > SPICC_MAX_FREQ)
-		master->max_speed_hz = SPICC_MAX_FREQ;
-	else
-		master->max_speed_hz = rate >> 2;
+	/* Setup max rate according to the Meson datasheet */
+	master->max_speed_hz = min_t(unsigned int, rate >> 1,
+				     spicc->data->max_speed_hz);
 
 	meson_spicc_oen_enable(spicc);
 
@@ -737,9 +735,11 @@ static int meson_spicc_remove(struct platform_device *pdev)
 }
 
 static const struct meson_spicc_data meson_spicc_gx_data = {
+	.max_speed_hz		= 30000000,
 };
 
 static const struct meson_spicc_data meson_spicc_axg_data = {
+	.max_speed_hz		= 80000000,
 	.has_oen		= true,
 	.has_enhance_clk_div	= true,
 };
-- 
2.22.0