mediatek: add support for SPI calibration

Newer MediaTek's SoCs need SPI calibration routines for SPI to work
reliably. Import patches for that from MediaTek's SDK.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/target/linux/mediatek/patches-5.15/434-drivers-spi-mt65xx-Add-controller-s-calibration-para.patch b/target/linux/mediatek/patches-5.15/434-drivers-spi-mt65xx-Add-controller-s-calibration-para.patch
new file mode 100644
index 0000000000..a64d622981
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/434-drivers-spi-mt65xx-Add-controller-s-calibration-para.patch
@@ -0,0 +1,43 @@
+From d278c7a0bf730318a7ccf8d0a8b434c813e23fd0 Mon Sep 17 00:00:00 2001
+From: "SkyLake.Huang" <skylake.huang@mediatek.com>
+Date: Thu, 23 Jun 2022 18:39:03 +0800
+Subject: [PATCH 4/6] drivers: spi-mt65xx: Add controller's calibration
+ paramter
+
+Signed-off-by: SkyLake.Huang <skylake.huang@mediatek.com>
+---
+ drivers/spi/spi-mt65xx.c | 16 ++++++++++++++++
+ 1 file changed, 16 insertions(+)
+
+--- a/drivers/spi/spi-mt65xx.c
++++ b/drivers/spi/spi-mt65xx.c
+@@ -800,6 +800,21 @@ static irqreturn_t mtk_spi_interrupt(int
+ 	return IRQ_HANDLED;
+ }
+ 
++static int mtk_spi_append_caldata(struct spi_controller *ctlr)
++{
++	struct spi_cal_target *cal_target = kmalloc(sizeof(*cal_target), GFP_KERNEL);
++	struct mtk_spi *mdata = spi_master_get_devdata(ctlr);
++
++	cal_target->cal_item = &mdata->get_tick_dly;
++	cal_target->cal_min = 0;
++	cal_target->cal_max = 7;
++	cal_target->step = 1;
++
++	list_add(&cal_target->list, ctlr->cal_target);
++
++	return 0;
++}
++
+ static int mtk_spi_mem_adjust_op_size(struct spi_mem *mem,
+ 				      struct spi_mem_op *op)
+ {
+@@ -1092,6 +1107,7 @@ static int mtk_spi_probe(struct platform
+ 	master->setup = mtk_spi_setup;
+ 	master->set_cs_timing = mtk_spi_set_hw_cs_timing;
+ 	master->use_gpio_descriptors = true;
++	master->append_caldata = mtk_spi_append_caldata;
+ 
+ 	of_id = of_match_node(mtk_spi_of_match, pdev->dev.of_node);
+ 	if (!of_id) {